FanGraphs Fantasy Baseball


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  1. PitchF/X does not rely on gun readings, it calculates the ball velocity via high-resolution (temporally) camera images and solving for ball motion using kinematics.

    However, if the camera calibration is off, velocities have been known to vary a bit park-to-park. 4 mph is well above “acceptable” calibration error, so either there’s a major malfunction in Duffy’s starts, some sort of data processing issue, or he started seeing the same doctor from “Rookie of the Year”

    Comment by czar — April 21, 2012 @ 2:50 pm

  2. Also, re: Duffy– it looks like FG has him at 95.1 mph average on the fastball which is a more modest 1.8 mph boost.

    Comment by czar — April 21, 2012 @ 2:55 pm

  3. Kauffman might be a little hot actually. As much as three mPH according to some.

    Comment by Eno Sarris — April 21, 2012 @ 2:59 pm

  4. Liriano jumped at a 1.4 MPH clip, but only threw 2.2 innings, so he didn’t show up on the leaderboard metric.

    Comment by Feeding the Abscess — April 21, 2012 @ 4:43 pm

  5. Went and picked up Duffy and dropped Norris in a 14 teamer.

    Kinda surprised he was still available, honestly.

    Comment by Schide — April 21, 2012 @ 5:23 pm

  6. I think this article suffers from an identity crisis – is velocity confirmatory (Duffy, Peavy), predictive (Scherzer), or both?

    Comment by scottzdiamond — April 21, 2012 @ 5:35 pm

  7. Both. All else equal, an increase in velocity should accompany an increase in strikeout rate. And when you see a pitcher’s strikeout rate jump, you want to search for an explanation to determine if it’s sustainable. A velocity spike is that explanation.

    Comment by Mike Podhorzer — April 21, 2012 @ 6:06 pm

  8. Eno is right, Kaufmann has been hot for quite some time.

    Comment by Eric Cioe — April 21, 2012 @ 8:54 pm

  9. I might just be bitter about losing a bet that Bruce Chen couldn’t hit 93 on FX (he hit 94), but I wouldn’t be shocked if Duffy’s velocity spike is entirely the product of KC’s F/X system.

    Aside from the aforementioned Chen, I’ve seen Hochevar hit at least 97, Nick Blackburn sit 93-94, and Kelvin Herrera hit 103 among others.

    Averaging 93 from the left side, and holding that velocity deep into the game, is still impressive.

    Comment by pau — April 22, 2012 @ 1:32 am

  10. On that list, the following pitchers have thrown a game at Kauffman:

    Danny Duffy
    Bruce Chen
    Max Scherzer

    Comment by Eric Cioe — April 22, 2012 @ 1:36 am

  11. Duffy in 4/16 start at Kauffman Stadium averaged 96.64 MPH on FB

    Duffy in 4/10 start at Oakland Coliseum averaged 93.13 MPH on FB

    Types and velos from Brooks Baseball. I’m not sure where the article’s 97.3 MPH average comes from.

    Comment by pau — April 22, 2012 @ 1:46 am

  12. Is there any proof that the Kauffman readings are high with pitchfx? I’ve heard the same rumor over and over but have never seen any actual evidence. Not talking about TV or stadium gun either (those are off everywhere).

    Comment by The Stork — April 22, 2012 @ 1:30 pm

  13. I looked about a week ago and it is hot by about 2 MPH and nothing has changed in the calibration of the gun yet.

    Comment by Jeff Zimmerman — April 22, 2012 @ 3:13 pm

  14. Has it been fixed? Duffy “only” peaking at 97 today. Previously I saw him reach 99 at the park.

    Comment by Mike Podhorzer — April 22, 2012 @ 3:14 pm

  15. Duffy’s FB still carries negative value, I haven’t seen him pitch, is it a flat FB with no movement? His curve seems like the most improved pitch

    Comment by eliasll — April 23, 2012 @ 5:49 am

  16. I rarely see situational stats taken into consideration. Duffy has struck out 15 out of 35 total batters faced when he throws his first pitch for a strike. Only 5 out 33 when he starts them with a ball

    Comment by eliasll — April 23, 2012 @ 6:02 am

  17. I will look at the other pitchers. They might of fixed it.

    Comment by Jeff Zimmerman — April 23, 2012 @ 8:10 am

  18. Yeah it’s hot. Who’s that reliever who was consistently 101-103mph against Detroit last week? Seems questionable.

    Comment by Andrew — April 23, 2012 @ 10:38 am

  19. Duffy averaged 94.8 yesterday, according to Brooks Baseball.

    Comment by geo — April 23, 2012 @ 11:14 am

  20. Andrew, that was Kelvin Herrera.

    Comment by Paul Sporer — April 23, 2012 @ 5:34 pm

  21. I think the radar gun in some particular stadium is pretty strange…
    Duffy pitched today and He clocked 99mph like 7 times…

    Comment by halladay — May 8, 2012 @ 10:48 pm

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