Will Pineda Be Homer Prone in New York?

While Michael Pineda‘s move from Seattle to the Bronx means he should easily reach double-digit wins now that he has an offense with a pulse supporting him, the change in home ballparks isn’t as sunny. Pineda’s old home, Safeco Field, is a graveyard for power hitters and a perfect spot for a pitcher who takes to the air often. Yankee Stadium, by contrast, goes 314 feet and 318 down the lines, turning warning-track shots in other parks into souvenirs. But those fretting over how Pineda will adjust to New York should take a closer look at his 2011 season — hitters lofted far fewer pitches against him during the second half of the season. That makes his transition to the Bronx a far less scary proposition.

At first blush, Pineda’s move from Safeco to Yankee Stadium does seem troubling. Pineda tied Tampa’s Wade Davis for the seventh-lowest ground ball rate (36.3%) among qualified starting pitchers during his rookie season. And while Safeco is where deep drives go to die (the park decreases home runs by five percent for left-handed hitters compared to a neutral venue, and 18 percent for righty batters), Yankee Stadium boosts homers by 43 percent for lefties and 15 percent for righties. Pineda succeeded by peppering the middle and upper portions of the zone with four-seamers and sliders in Seattle, but that’s a dangerous strategy in a park where homers come cheap.

There’s no question that Pineda’s new digs aren’t as forgiving as the ones he left behind in Seattle. But happily, Pineda’s extreme fly ball act was really only limited to the first three months of the 2011 season. Check out his ground ball percentage by month:

Month Ground Ball Pct.
April 30.9
May 36.6
June 26.5
July 40.6
August 46.8
September 45.3

Pineda’s ground ball rate was just 30.9% in April, May and June. From July through September, however, he burned worms at a league-average 44% clip. Pineda got more grounders by throwing his high-and-heavy fastball less often and relying on his slider even more (he also threw more changeups). Both offerings had a healthy boost in ground ball rate once the calendar hit July:

Pitch Pct. Used April-June GB Pct. Pct. Used July-Sept GB Pct.
Fastball 66 27.9 55 35.1
Slider 31 44 35 55.2

Source: Joe Lefkwitz’s Pitch F/X Tool

So, why does this matter? Pineda’s second-half increase in grounders could just be a fluke, right? Maybe, but I wouldn’t bet on it. Changes in ground ball rate for pitchers become significant after about 150 plate appearances, and Pineda took on 288 batters from July through September. It’s far more likely that this trend signals a real improvement in Pineda’s grounder-getting prowess.

Some might point out that as Pineda’s ground ball rate climbed, so did his ERA (2.65 from April-June, 5.35 from July-September). But, aside from incredibly low strand rates with runners on base during the second half (something that doesn’t have predictive value), you’d be hard-pressed to say that Pineda pitched any worse. In terms of the stats that better predict future ERA than past ERA, Pineda was actually better. He struck out more batters while keeping his walk rate steady, resulting in more than a half-run drop in his xFIP:

Month K Pct. Walk Pct. xFIP
April-June 24.3 7.8 3.76
July-September 25.7 7.9 3.2

Pineda’s increased ground ball rate has implications for his road starts, too. While Rangers Ballpark is homer-happy, Pineda got the benefit of pitching in the [Insert Corporate Name Here] Coliseum and Angel Stadium in addition to Safeco while in the AL West. The Coliseum and Angel Stadium are brutal home run-hitting parks:

Park LH HR Park Factor RH HR Park Factor
Rangers Ballpark 119 114
The Coliseum 89 80
Angel Stadium 90 93

In the AL East, Pineda will have to contend with two other road parks that pump up home run production significantly:

Park LH HR Park Factor RH HR Park Factor
Camden Yards 118 123
Fenway Park 79 94
Rogers Centre 114 116
Tropicana Field 89 82

Taking a quick look at Pineda’s overall ground ball rate in 2011 is enough to make an owner think twice before spending a premium pick on a guy moving from a plum pitcher’s park to one of the game’s most homer-friendly stadiums. But that quick look obscures the month-by-month progress that Pineda made in keeping the ball down, progress that makes him better equipped to pitch in Yankee Stadium and also keep the ball in the yard when he travels to Camden and the Rogers Centre. With a more even ground ball/fly ball profile and plenty of Ks, Pineda will be just fine in New York.




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A recent graduate of Duquesne University, David Golebiewski is a contributing writer for Fangraphs, The Pittsburgh Sports Report and Baseball Analytics. His work for Inside Edge Scouting Services has appeared on ESPN.com and Yahoo.com, and he was a fantasy baseball columnist for Rotoworld from 2009-2010. He recently contributed an article on Mike Stanton's slugging to The Hardball Times Annual 2012. Contact David at david.golebiewski@gmail.com and check out his work at Journalist For Hire.


13 Responses to “Will Pineda Be Homer Prone in New York?”

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  1. Tom B says:

    Long story short… no.

    Simply looking at his batted ball data from last year you would have seen that he would have given up zero extra home runs moving his home games from SafeCo to YS last year.

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    • Matt H says:

      Keep in mind that HR factors aren’t just about distance to the fence, but also wind, humidity, and other miscellaneous factors like that. Not saying you’re wrong, just that looking at the distances of his home runs and fly balls won’t necessarily tell you the whole picture.

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      • Tom B says:

        Certainly, just like looking at the park factors won’t tell you those things either :)

        If you look at the batted ball data, there was a large gap in the hits he gave up between the middle of the outfield and the homeruns that went out. He just doesn’t get hit hard, and if his GB rate is real… he won’t get hit hard in the future either.

        Sometimes that wind blows in too :)

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  2. Ender says:

    Considering the improved lineups he is facing, the smaller parks he has to pitch in and the pretty large drop in defense behind him I’m avoiding him for this year in fantasy at least. I think he takes a step back this year because of all of these factors even if his actual skills improve a little bit with experience.

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    • Stuck in a slump says:

      Mariners had a much worse defense than the Yankees did last year. So he’s actually improving his defense in the move.

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  3. Matt V says:

    Excellent Article.

    This dispells a lot of myths thrown out there about Pineda’s move to NY.

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  4. Oregon Nut Cups says:

    If anything, I’d be more concerned with the personal move of small market to big market. The talent is there, but even veteran arms have passed through NY and then been gone because they couldn’t handle it. I wish the best for Pineda but its something that has to be considered when evaluating the move.

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  5. GotHeem says:

    Where can I find a list of park factors for lefties and righties?

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  6. jon says:

    I read half-way through the article before I realized “Will Pineda be Homer Prone” referred to long-balls and not the ever-present Yankee fanboys inflating his ADP come draft day!! Very good article nonetheless.

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  7. kid says:

    The numbers make sense but seeing that small park really does a mind job on me. I can’t get that image out of my head of harmless flyball outs in most parks drifting over the 320′ fences.

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  8. johnnycomelately9 says:

    That’s why in the future Yankee hitters are going to pile up all the records. Inflated park lol.

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  9. STEALTH says:

    Would’ve been nice to see the SAFECO and Yankee Stadium HR Park Factors along with the rest of the AL West and East. I know it’s easy enough to find elsewhere, just would’ve been nice to include them here. Anyway, solid analysis. I, too, think Pineda will be fine (and he will presumably find out what run support is with the Yanks).

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