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  1. “Either way, it is clear that his best days are behind him.”

    That’s pretty clearly false. At best, you could maybe say that Fielder’s best days could be behind him. But you’re talking about a guy who’s missed one game in the last three years. Regardless of what happens next, I don’t think there’s any evidence to support the notion that he’s certain to start declining now.

    Comment by Kyle Lobner — October 28, 2011 @ 11:08 am

  2. No fatties

    Comment by oldjacket — October 28, 2011 @ 11:13 am

  3. Pretty much what this showed me is people here expect him to fall off a cliff in about a year and a half just because he is fat.

    Comment by drt — October 28, 2011 @ 11:17 am

  4. “I don’t think there’s any evidence to support the notion that he’s certain to start declining now.”

    You should try rereading the article, because that seemed to be all the evidence he was showing.

    Comment by Troy Patterson — October 28, 2011 @ 11:17 am

  5. Also with the best years behind him, it must have been strange for him to have his second best year just this year.

    Comment by drt — October 28, 2011 @ 11:18 am

  6. time for Prince to go all out and switch from vegetarian to vegan

    Comment by delv — October 28, 2011 @ 11:21 am

  7. Is the causation here just assumed: Fat caused the steeper decline? Does this study attempt to control for even a single other variable?

    Comment by swieker — October 28, 2011 @ 11:26 am

  8. Fat wasnt even the variable—it was weight. And, of course, muscle weighs more per unit of volume than fat.

    Comment by delv — October 28, 2011 @ 11:32 am

  9. I once knew a girl who coped with veganism by eating nothing but chips, or, as your nation calls them, french fries.

    Needless to say I did not know her biblically.

    Comment by Well-Beered Englishman — October 28, 2011 @ 11:42 am

  10. Actually, if his 2011 was the 2nd best year of his career, isn’t it more likely that his best years are behind him? The 2011 season is now in the past. Unless for some reason you expect him to get better from here on out then, yes, his best years are in the past. That doesn’t mean that he’s not an excellent player now, or that he’ll suddenly be mediocre.

    Comment by Yirmiyahu — October 28, 2011 @ 11:44 am

  11. Ryan–Do you see any differing effects from this trend of fatties vs averagies over time? It’s pretty clear that there are different conditioning regimes for everybody in the league than there were 20/30/50 years ago. I’m just wondering if a subset of people over the last twenty years follow the same trend? After all, we’re talking about somebody who at the age of 25 DID go veg in an attempt to control his weight…a far cry from a pack a day (of cigs and hot dogs) for some of the heavy sluggers in the past.

    Comment by madisomoose — October 28, 2011 @ 11:45 am

  12. That is a diet I would gladly sign up for, particularly if we’re not talking about thin little McDonalds french fries.

    Comment by Yirmiyahu — October 28, 2011 @ 11:46 am

  13. I wonder the what the result would be if you charted the aging curves of elite non-heavy players vs. elite heavy players. Isn’t it generally believed that regular aging curves do not fit the known aging of elite players? If that’s the case, then we may get a different picture then what the chart currently shows.

    Also, a different aging curve for elite heavy players vs. all heavy players might explain the uptick at the age 30 season in the graph above as the non-elite heavy players are being bumped from the game, while the elite heavy players are still playing and contributing well.

    Comment by SeaWolf — October 28, 2011 @ 11:58 am

  14. Our sample already gets small enough in the latter years without separating the heavy players into further sub-sets. In theory it’s a good idea, but I think our sample would get too small to draw any legitimate conclusions.

    Comment by Ryan Campbell — October 28, 2011 @ 12:03 pm

  15. The best you could say is that the data supports the idea that teams are perhaps right to be wary of his weight, as it could lead to a sharper decline than the average player. He’s comparing an individual to an average; that can tell us something about the risk he carries, but it can’t tell us conclusively how the individual player will age. In Fielder’s case, he’s an extremely durable player, coming off a peak-type season who’s shown no signs of decline. It’s silly to assume that he’s already in decline based on the average of a group of players who share a single trait with Fielder.

    Comment by WilsonC — October 28, 2011 @ 12:04 pm

  16. Good question. I did not look at the data that closely because I feel that it is making too many inferences. For example, Mo Vaughn obviously had access to better nutritional information and workout regimens than Babe Ruth. However, that doesn’t mean he actually used them. You start to get into muddy waters when you assume that a player acted a certain way just because of the era he played in. In Fielder’s case, it does appear that he has made a conscious decision to watch his weight and take care of himself, so that is a plus. There are definitely heavy guys, regardless the era, who bottomed out because they didn’t take care of themselves.

    Comment by Ryan Campbell — October 28, 2011 @ 12:07 pm

  17. Shouldn’t this mimic real life?? Just because he is a baseball player doesn’t negate the clear fact that extra weight causes more stress on the body, especially after age 30.

    Comment by Hurtlocker — October 28, 2011 @ 12:12 pm

  18. His father started to go down hill in his age 30 season. Boras will get him a big, long contract, which more than likely he will not produce enough WAR to justify the investment.

    Comment by maqman — October 28, 2011 @ 12:15 pm

  19. I remember reading a study that showed players who are elite at a young age peak for a longer time and regress later than average. I would think this would still apply to heavier players as well. I think the real key to Fielder is the defense which makes him a lot less valuable than people tend to think he is.

    Comment by Ender — October 28, 2011 @ 12:18 pm

  20. I agree with this analysis, but I’ll admit being biased, because this is what I’ve suspected all along. Over at Bluebirdbanter, there’s a bunch of Jay’s fans salivating over the possibility of signing Fielder, more than Prince himself would salivate over a tofu burger. I’ve been arguing he won’t age well and there is no way I’d bid for him, given what the competing offers are likely to be.

    Comment by bluejaysstatsgeek — October 28, 2011 @ 12:19 pm

  21. I don’t get the people who are saying Fielder is somehow healthy because he switched to vegetarianism. People who are vegetarian can eat unhealthfully too, ya know.

    Comment by hunterfan — October 28, 2011 @ 12:24 pm

  22. “Either way, it is clear that his best days are behind him.”

    I deinately disagree. This statement is not accurate at all. It is an excellent article, and it presents extremely valuable information. With that said, the “evidence” presented is showing an average. Odds are, Fielder’s best days are behind him. Unless you can show a breakdown that every single hitter of Fielder’s type saw a dropoff, that line is completely invalid. Given that exceptions to the rule, such as Ortiz, are given in the article, I am not sure how this claim is backed up. The sentence could be re-worded.

    Comment by DirtyDisa — October 28, 2011 @ 12:36 pm

  23. The sample is already too small to draw any legitimate conclusions. Plus, where does a 200 player sample come from? Historical players selected at random?

    Is this a sub-set of the peak year analysis Tango, et al. did a few years ago? The peak year looks even younger than theirs in that revised analysis to Bradbury’s, which took out all the cup of coffee guys. I strongly agree with Bradbury’s approach, btw, and Tango, et al. acknowledged there are some problems with their approach despite favoring it over Bradbury’s.

    Now here we are using some unknown sub-sample of some peak year analysis without acknowledging what method was used or that there is disagreement on methodology. Bradbury’s approach clearly was not used, which means that it is likely your small sample size problem is going to be dramatically exacerbated by including AAAA players, who tend to be corner outfielders, catchers, and 1Bmen, all fatter. Fail.

    Comment by Paul — October 28, 2011 @ 12:37 pm

  24. Yea, I agree Hunterfan. If I remember correctly, Prince didn’t become a vegetarian for his health. I believe his wife showed him an animal cruelty video. I read that in a Prince interview years ago, so that could be off.

    Comment by DirtyDisa — October 28, 2011 @ 12:42 pm

  25. I think there is something to be said for the fact that Fielder seems to be naturally that size, instead of simply failing at nutrition / conditioning and getting fat and out of shape like some players do.

    Fielder’s already poor defense coupled with his aging is a big concern, but it would be for a thin but poor defender as well. I would feel a lot better giving him 6 years as an AL team. Huge crap shoot if he has to play defense; it could get so bad that it would negate a lot of value.

    Also, how do this analysis account for players who may have crossed into or out of your sample size during their careers? For example, a player who gains enough weight to put him into the group halfway through his career, or one who loses a enough to leave the group, or a borderline case where fluctuations could put them into or out of the sample on a year by year basis?

    Also, shouldn’t there be more of a distinction between “big” (muscular) players and players that are simply “fat”?

    Comment by Flharfh — October 28, 2011 @ 12:44 pm

  26. I’m not sure I buy the aging curve. What I want to see is if you take all fat guys in year n and look at their year n-1, what’s the difference, on average. Otherwise you get a sampling problem, namely, that since there are vastly more skinny/normal dudes, the ones who fell off a cliff in year n-1 aren’t in n and the rest of the guys wash out the average to make the changes look small.

    Comment by philosofool — October 28, 2011 @ 12:47 pm

  27. I don’t think that’s the correct interpretation, Yirmiyahu. If you look at the curve, it shows that a heavy player’s age 26-27 season is, on average, his fifth-best year. So if Fielder had his second-best year in that season, perhaps it shows he’s at least something of an outlier from the curve.

    Prince could post better numbers next season – although I’ll admit they’re only likely to be slightly better. But It’s not unheard of for players to post their best years in their age 27-28 seasons (Jacoby Ellsbury this season, Ben Zobrist in 2009; Chase Utley was 29 in 2008, etc.).

    Plus, I’ll grant that Prince is quite heavy by any measure, but is there any particular logic to choosing 3.25 lbs per inch of height as the cutoff? That seems arbitrary. Why not use BMI or make up any other test for “heaviness”?

    Comment by AJS — October 28, 2011 @ 12:52 pm

  28. According to the same logic, any player has had his best days behind him by the age of 27. It’s obviously not going to hold true in a large number of cases. Certainty is FAR from established by a line graph showing averages.

    Comment by Abreutime — October 28, 2011 @ 1:01 pm

  29. I would guess that “heavier players” are more likely to be moved to easier positions as they age. It would be more useful, then, to compare just players that started as 1Bs because they’re less likely to take a positional value hit, right?

    Comment by k — October 28, 2011 @ 1:21 pm

  30. Don’t remember where I read/heard it, but I thought Prince had given up the vegetarianism thing.

    Comment by Richie — October 28, 2011 @ 1:27 pm

  31. Not pitchers, but otherwise this is a good point.

    Comment by AJS — October 28, 2011 @ 1:28 pm

  32. Agree. But it goes even further. We have no idea what the sample parameters are and it’s only 200. The only way that’s not incredibly small is if you used only HOFers. Not to mention where the height and weight data came from, as we know that it is not exactly accurate. We have seen a trend just in the past few years of players losing huge amounts of weight in the offseason. In the steroid era we saw the opposite. I.e., enormous bias issues.

    On some local blog somewhere this would never be questioned, but analysis with all these problems should not be published on FG in order to argue that one of the best hitters in his generation is washed up simply because he’s fat.

    Comment by Paul — October 28, 2011 @ 1:35 pm

  33. are you sure the difference is statistically significant? i’m skeptical.

    Comment by Dudley — October 28, 2011 @ 1:36 pm

  34. what is the coefficient for the “heavy” dummy variable? what’s the MSE? seems like a few outliers could’ve skewed the data.

    Comment by Dudley — October 28, 2011 @ 1:40 pm

  35. Actually, Fielder has not been a vegetarian for some time. It has been reported on elsewhere.

    Comment by Shawn — October 28, 2011 @ 1:49 pm

  36. Rarely do i smh at fangraphs. He should be paid just as much as a skinny player with the same production. Workplace discrimination is not cool!

    Comment by Keystone Heavy — October 28, 2011 @ 1:50 pm

  37. At Fielder’s height of 5’11”, he would have to be 231 pounds to qualify for the “heavy” group, based on 3.25/inch. FG lists his weight at 268 and BR lists him at 275, and I wouldn’t be surprised if both were low. I wonder what the aging curve would look like with a cutoff closer to Prince’s 3.77? Also as one person has pointed out, muscle is more dense than fat, there’s no doubt that a lot of the weight that he carries is fat.

    Comment by bluejaysstatsgeek — October 28, 2011 @ 2:19 pm

  38. Not sure where you inferred washed-up from. The worst case scenario I projected is still $122 million dollars in value, which is a pretty darn good player. The point is that you are assuming a lot more risk in years 5,6,7 than you would with most other players.

    Comment by Ryan Campbell — October 28, 2011 @ 2:28 pm

  39. Prince Fielder is too fat, even for my team!

    Comment by Billy Beane — October 28, 2011 @ 3:28 pm

  40. Once again people are using an aggregate and applying it to an individual circumstance with certainty.

    It would be one thing to say “I’d expect Prince Fielders best days to be behind”, it is a whole different ball of wax to say “Either way, it is clear that his best days are behind him.”

    What this would entail would be not simply looking at the aggregate but looking at every individual case and seeing if all of them declined as the aggregate curve did. It’s the same thing with lineup protection is myth, pitching to score is a myth, etc… on aggregate it might show no/little effect, but it doesn’t mean it holds for every player and every situation.

    Comment by Hank — October 28, 2011 @ 3:30 pm

  41. Ryan, how was the weight screening done? (in evaluating average vs fat)

    Did you consistently evaluate this year to year if a guy got into or fell out of shape? Did you just look at weight/height at a specific age and assume the body type was consistent over the career? Or at the start (or end) of the career, independent of age?

    Also, perhaps a minor point, but is the weight data accurate? Not sure where Jeff pulled it from, but sometimes the published data can be “massaged” by teams… (though this is probably more likely with overweight players so it may be less of an impact)

    Comment by Hank — October 28, 2011 @ 3:42 pm


    If I was a GM looking at signing Fielder to a long-term deal, that bottom graph would scare me plenty.

    Comment by Mayor McFleas — October 28, 2011 @ 3:48 pm

  43. I can’t buy into the conclusion that since other big guys, on average, have done such and such, then Fielder is destined to the same fate. First of all, the Prince’s profile looks *nothing* like the average profile shown here for big players. In particular, Prince has not been steadily declining since his age-23 year, he’s been steadily getting better. If you are going to make some claim about what Prince may or may not do, you should at least compare him to other players that have had the same trends as he has through his age-27 year.

    Comment by RobBob — October 28, 2011 @ 3:51 pm

  44. Ok, so who do I start planning as my replacement for Prince on my dynasty fantasy team?

    Comment by Scooby Doo — October 28, 2011 @ 3:53 pm

  45. It was the same analysis Tango used. I got the method from him. Here is the methodology I used:

    No where did Tango or MGL mention that Bradbury’s method was better. It had huge survivor issues.

    It is weighted by PA, so it will minimize the AAAA players.

    Comment by Jeff Zimmerman — October 28, 2011 @ 3:56 pm

  46. The n and n-1 method was used. Here is how the data was calculated:

    Comment by Jeff Zimmerman — October 28, 2011 @ 3:59 pm

  47. I was the data for the player listed in the FG dataset. I expect the weight numbers are low.

    Comment by Jeff Zimmerman — October 28, 2011 @ 4:02 pm

  48. Here are some more names added to it:,4613,2154,899

    Comment by Jeff Zimmerman — October 28, 2011 @ 4:07 pm

  49. C.C. Sebathia

    Comment by Vincent — October 28, 2011 @ 4:15 pm

  50. One problem with this study, roster weights are rarely accurate. I remember when I was 18, I’d lie and write down 200. Then when I was 25, I’d lie the other way, and say 210. LOL!

    Comment by Bill — October 28, 2011 @ 4:37 pm

  51. You also have to consider the fact that the Brewers were reported to be stealing signs when at Miller Park. I for one, am predicting a decline once he doesn’t know when a fastball is coming. He slugged about 200 points higher at home this season, and he hadn’t had those kind of splits over the rest of his career….

    I honestly don’t know if they were stealing signs or not, but he should regress somewhat if he leaves that park for a different one regardless of the reasoning behind his awesome numbers there.

    Comment by adr3 — October 28, 2011 @ 4:46 pm

  52. I realize we don’t have any alternative, but bear in mind that they lie about height and weight in the media guides (or on baseball cards) all the time.

    I’m not saying Fielder’s not fat–obviously–I’m just saying that certain criteria such as height to weight ratios will be subject to data manipulation outside our control.

    Comment by jcalton — October 28, 2011 @ 4:49 pm

  53. Sorry, Bill we must have been posting at the same time.

    Comment by jcalton — October 28, 2011 @ 4:49 pm

  54. It’s his future production that’s at question, and whether his weight will cause him to produce less than an equivalent thin(ner) player (and therefore should be paid proportionately).

    Comment by joser — October 28, 2011 @ 5:15 pm

  55. This isn’t football though. I’d say most baseball players who are 6’0, 234 or 6’3 245 generally aren’t “muscular” and probably have above average body fat percentages.

    Another issue with this analysis is guys lying about their weight in their roster pages. There might be guys who, looking at them and assuming their true weight, would meet the criteria but get missed.

    David Ortiz is listed as 6’4, 230. There is no way that is true. I’m about 6’3 230 and he is much larger than me. Let alone the fact that despite having a gut, he has muscle too.

    Comment by John — October 28, 2011 @ 5:20 pm

  56. I didn’t scroll down to your post jcalton before posting mine.

    There are guys like Ortiz who are clearly lying about their weight in the roster guides and get missed in this analysis (although Ortiz is a guy who would likely buck this aging curve ironically, although (alleged) PED use muddles that)

    Comment by John — October 28, 2011 @ 5:31 pm

  57. McDonalds fries contain trace elements of animal products (beef) for flavoring purposes.

    Comment by Dizzy Valance — October 28, 2011 @ 5:59 pm

  58. Prince is fat. He’s been fat his entire life, even as a child. He’s to date never spent a DAY on the disabled list-majors or minors. He doesn’t ever miss games for nagging injuries, illness, or personal problems. He plays almost every inning of every game and has done so for years. Prince isn’t like other players. He’s named Prince-that’s royalty. He has the most dynamic left handed power swing I’ve seen in my lifetime.

    Prince isn’t going to fit neatly into any graph. He’s already an outlier. I predict he remains one. He can play on my fantasy team and I hope my favorite team signs him-long term, if necessary.

    Comment by jirish — October 28, 2011 @ 6:59 pm

  59. “Tango, et al. acknowledged there are some problems with their approach despite favoring it over Bradbury’s.”

    Perhaps you didn’t read the part where they acknowledged that neither method is “correct,” but that they “believe” theirs is more correct. I disagree. It merely trades one bias for another.

    And using their method and selecting for some unknown sample of 200 players will exacerbate the AAAA effect despite the weights. I’ll take the survivor bias issues over some arbitrary weights that may or may not actually exacerbate the AAAA problem with such a small sample.

    Comment by Paul — October 28, 2011 @ 7:04 pm

  60. You are assuming more risk in later years than with mediocre players. I’ll stop complaining if you run the analysis using Bradbury. If you think it’s wrong, say so and why. But why not put them side by side?

    Comment by Paul — October 28, 2011 @ 7:10 pm

  61. If this article was turned in as a Freshman statistics 101 paper, it would probably get a B-.

    At least the team that signs him can be certain his performance will have a small increase after his 29-30 season!

    Comment by DavidCEisen — October 28, 2011 @ 8:21 pm

  62. How does weight correlate with traits other than WAR?

    For instance, if players who spend time on the DL when they’re young tend to fall off sooner, and large players tend to be injured more, that could explain the numbers shown by the graphs, yet Fielder’s been extremely durable so that could muddy the results. Or, strikeout rates – Fielder makes better contact than a lot of mammoth sluggers like Dunn or Vaughn – does his better contact rate move him out of the “old player skills” classification?

    There’s really several possibilities: weight could directly cause many players to decline more sharply, or weight could indirectly cause some players to decline sooner by affecting some peripheral factors (such as durability), or players who share a peripheral trait (such as high-K rates or poor speed) may be more likely to be large.

    Fielder’s big, but he’s not defined by his size; it’s just one of many traits he has, and it doesn’t negate the need to look deeper to properly assess the comparative risk of Fielder versus other players.

    Comment by WilsonC — October 28, 2011 @ 8:44 pm

  63. About 10 years ago some Ivy Leaugue school released a study that said 85% of NFL players were obeses as measured by BMI (height/weight). This article involved more math, but was logically just as flawed.

    According to Ryan Campbell, Arnold Schwarzeneger and Boomer Wells were equaly fit people.

    Unless you know the muscle and bone mass vs the fat mass, you don’t really have anything to study…unless we can all agre that Herschel Walker had 2% body fat and was obese.

    Comment by the real neal — October 28, 2011 @ 8:54 pm

  64. Thankfully this isn’t football. Yes BMI and height/weight ratios don’t work in football because you would be comparing running backs and their tree trunk muscular thighs to offensive lineman and their guts.

    This is baseball. How many baseball players look like Arnold or Herschel Walker? The only player that really jumps out to me from the list that might not fit is Carlos Delgado.

    Here is a list of recent players whose names I quickly recognized. None of these guys have “2% body fat”. And there was a ton of guys who I am assuming are old-timers and whose names were “Tub” and “Jumbo”. I have no idea who they are but I’m guessing they aren’t the pinacle of personal fitness.
    Toby Hall
    Andres Galarraga
    Humberto Quintero
    Bucky Jacobsen
    Bengie Molina
    Carlos Lee
    Randy Ruiz
    Adam Dunn
    Wily Mo Pena
    Randall Simon
    Dmitri Young
    Mo Vaughn

    Comment by Ryan Campbell — October 28, 2011 @ 9:10 pm

  65. A very valid concern. If I had the time and resources to go and measure and weigh every MLB player ever I would, but unfortunately that’s just not realistic and we do our best with the data we have. I should have noted this in the article, thanks for brining it up.

    Comment by Ryan Campbell — October 28, 2011 @ 9:13 pm

  66. There is definitely more than one way to analyze what Fielder will do. I am sure as the off-season progresses we will post more articles. We try to keep our articles concise and to the point, so this was just a look at one factor of the entire Prince Fielder puzzle.

    Comment by Ryan Campbell — October 28, 2011 @ 9:15 pm

  67. Fair point. I guess the way I worded it inferred 100% certainty, and nothing in baseball is ever 100% certain.

    Comment by Ryan Campbell — October 28, 2011 @ 9:17 pm

  68. Great article. I’m not sure why so many people are hung up on the phrase ‘his best days are definitely behind him’. It’s incorrect, but I think the readers should assume nothing in the future is ‘definite’, and figure out that the author meant statistically likely’.

    Beyond that, I’d have two questions-

    1-Can the WAR declines be segregated by position? Someone like CLee is going to lose an awful lot of defensive WAR when he plods through LF, not to mention the stress on the body. Someone at 1st might not lose nearly the same range, especially if he is quicker than he is fast, nor will the body stress be as high.

    2-Is there a way to ‘value-in’ the difference between the AL and NL? It just seems like there should be a difference. If the RS want, they can slide Youk into DH and not gut his value. The Astros only choice is to trade CLee and eat a huge chunk of salary. I assume the decline in WAR is due to positional deficiencies that might not play out the same in the NL and AL.

    Comment by Joey B — October 29, 2011 @ 11:16 am

  69. AJS: BMI is just a weight per inch calculation anyway, they just chose a value that makes for a weight slightly into the “obese” category. Which is still a silly thing to do when talking about athletes, who pretty much all calculate as overweight/obese because BMI just doesn’t work for tall, muscular people.

    Comment by Careless — October 29, 2011 @ 5:27 pm

  70. “At best, you could maybe say that Fielder’s best days could be behind him. But you’re talking about a guy who’s missed one game in the last three years. Regardless of what happens next, I don’t think there’s any evidence to support the notion that he’s certain to start declining now.”

    You understand the argument you are making here supports the idea Fielder is due for a decline. Few players miss only one game in three years even in their prime, adjust his WAR numbers for averaging 150 games or even less and that’s a decline in total value even if his rate stats remain unchanged.

    Comment by ValueArb — October 30, 2011 @ 1:46 am

  71. Fielder could easily be the exception to the rule here, like Babe Ruth. For one thing he is far from the typical heavy guy as he is a vegetarian. I doubt many if any other fat guys were or are vegis. Perhaps eating ones vegis will make him more durable. But regardless, he may have a greater probability to decline because of his weight, but that decline is far from guarranteed. You could bet he becomes Babe Ruth as easily as Mo Vaughn.

    Comment by kick me in the GO NATS — October 30, 2011 @ 2:07 am

  72. We all realize that Prince Fielder and Cecil Fielder have different skills right?

    Heck, if you go by the metrics here, CF was a better fielder than PF. Who woulda guessed that?

    CF had 2 seasons where his batting run value was greater than 20. PF has had 3 straight. CF had season over 50 Batting runs, PF has had 3.

    Comment by CircleChange11 — October 30, 2011 @ 2:44 am

  73. interesting read. i think the unknown here is how will Fielder take care of his body over these next few years? You saw Ryan Howard lose weight and work on this defense and the Phils rewarded him partially on that. though i think I’d still rather give Prince a 7 year deal than have the older Howard for the next 5, and that was before Howards injury. What concerns me is that while Prince has a big year in this his “job interview” year, i would have been more impressed if he had really done something to get his body in better shape and give me more confidence he’ll hold up better when he gets into his 30’s.

    Comment by PHILLY JIM — October 30, 2011 @ 2:26 pm

  74. It’s nice to see the “aging curve” to back up what people have said all along, but I’m skeptical about a couple of things regarding this study.

    First off, it’s not at all clear that Fielder has shown a single sign of decline yet, which the curve suggests on average, he should have. Second, I’d be curious to know what the statistical reason for the decline tends to be for the heavy players, and compare that to the normal population. One thing you do include is the positional adjustment, and yeah, heavier players tend to work their way toward 1B or DH, if they don’t already start there.

    Fielder’s UZR and BRR, while poor, have remained steady; while his ISO has bounced around a bit, nothing seems amiss. I’d have to guess that much of the projected decline would stem from a combination of normal aging and small losses of bat speed, which should lead to worsening contact rates and increased ground ball rates. Prince just posted a career-best contact rate, which I believe bodes very well for his immediate future, though he is hitting fewer fly balls than before (which is bad).

    His body type is just one thing to focus on, and it’s certainly possible that he remains healthy and productive for years to come. I wouldn’t say that either is very likely past his early to mid 30s, but I would say that of any Major League player. As long as he keeps his contact rate up and continues to hit the ball very, very hard, there doesn’t seem to be much to worry about.

    Comment by Dan Greer — October 31, 2011 @ 1:58 am

  75. Pitchers are going to be different. Cy Young was fat as hell and pitched to 44. He was still throwing OK at that age, but he was such a tub they literally (and cruelly) bunted him out of the league.

    Comment by baycomuter — October 31, 2011 @ 6:24 pm

  76. We’re talking about Fielder’s Body Fat, not Carlos Lee’s, though? That’s the point I was making. Fielder probably has a lot higher muscle/fat ratio than the average player on your list.

    Comment by The Real Neal — October 31, 2011 @ 7:26 pm

  77. Just caught this one:

    “Either way, it is clear that his best days are behind him. ”

    No, it’s not. It’s clear that the average player in your study had his best years behind him. There’s not a single person in baseball who would be shocked if Fielder has his best year next year.

    Comment by The Real Neal — October 31, 2011 @ 7:36 pm

  78. and most don;t compare to Fielder in terms of production.

    Comment by ray — November 5, 2011 @ 5:48 pm

  79. Well, Bucky Jacobsen wasn’t fat, I remember that. Dude was built like a 19th century lumberjack. Too bad he got injured: he hit some mammoth shots for the M’s in his 1/2 season.

    Comment by Harlock — November 9, 2011 @ 11:38 pm

  80. Nice article. Unbelievable the random excuses people have made up in the comments. The data speaks for itself. If Fielder had had even a slightly down year, people would be clamoring to bury him. Yet because he happened to have a nice year, he is the exception to what the data shows. Right…

    Comment by evo34 — November 11, 2011 @ 12:55 am

  81. The number of players who have multiple great years is small. The number of players who have lengthy primes is small. The number of players who decline (in general, not on the dot) after 27 is large. The number of fatasses who don’t decline faster than average is small. Miller is a hitters park, the NL Central also has had pretty weak pitching.

    So yea, what exactly says he won’t decline? That he’s an “outlier”? The production curves of all players are similar. He may still be more productive at 35 than other fat players, or other players in general, doesn’t mean he’s going to be worth the huge contract he gets.

    Comment by Antonio Bananas — November 29, 2011 @ 11:11 am

  82. Prince cannot field, therefore, he is already best suited to DH.

    Should he DH, or at least be allowed to do so in the near future and not have his fielding hurt his WAR then his value probably sustains well.

    We are talking about someone that is 5’11” 270lbs, that is not big, heavy, or large…that is just huge, unhealthy, and undoubtedly a risk to both his heart and his appendages. That make him one of the largest players in recent history, absolutely massive for an athlete. Most NFL lineman are around 300lbs or weigh 30lbs more and are AT LEAST 5in. taller, if not 10in.

    I think he is a 5.5 WAR player for a few seasons, likely the next four, and should safely pull in 28 WAR over the next seven seasons making a 7yr/140M a worthwhile risk, IMO. Should the team be in the AL with a DH spot open in the in the three years then something in that range would be a good move. Every signing comes with risk and what this guy is able to do is crazy good. He can walk with the best of them and is a true .300/.400/.500 guy.

    Comment by Justin — December 14, 2011 @ 7:22 pm

  83. So, you’re saying Fielder is remarkably fat for a baseball player, yet he’s going to be even a little bit better than his projection next year for the next FOUR years, a period when players typically decline? How does that make sense?

    I don’t think anyone thinks that Fielder for 20m a year is going to be a bad bet, even for seven years. It’s when you get into the 25m range that a long contract starts to look unreasonable.

    I do think Fielder’s at the stage where his fielding has become a real threat to his long-term value, to the point where one more step down and his fielding makes him, in effect, a DH for the purposes of WAR, even he’s still running out to first base every inning. I’d be more convinced by the arguments in favor of Fielder resisting the inevitable over the next five years if it could be persuasively argued that fat players hold onto their value reasonably well in the field, not only at the plate. I doubt that argument can be made well.

    Comment by Jack Straw — December 28, 2011 @ 11:16 am

  84. Great article, it’s even better looking at the date it was written, 2011. Fast forward to 2013 ALCS, fielder has 0 RBIs his batting avg the entire post season is less than .100 and has 0 extra base hits.

    Comment by Tigers fan — October 20, 2013 @ 12:18 am

  85. I think he batted .200 or somthin still terrible and maybe 1rbi. By the way his huge contract was just sent to Texas to deal with, along with $30 mil. Basically tigers Orginization saying it didn’t work out.

    Comment by Tough — November 21, 2013 @ 6:32 pm

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