FanGraphs Baseball


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  1. How accurate is the determination between a 4-seam and 2-seam fastball? Its amazing they can tell the difference. I caught for many years and even at the viewpoint it isn’t too easy.

    Comment by Lucas — November 4, 2009 @ 3:07 pm

  2. Lucas,

    I use the pitchf/x data to create my own pitch identifications. I use pitch speed, horizontal spin deflection (movement) and vertical spin deflection to classify each pitch. I am fairly confident in my classifications, but the 2-seam 4-seam fastball distinction is tricky. Here are Martinez’s pitches plotted by their horizontal and vertical movement. The color scheme is the same used in the pitchf/x section here (green four-seam fastball, blue two-seam, yellow change, aqua cutter and purple curve).


    Comment by Dave Allen — November 4, 2009 @ 3:18 pm

  3. Pedro has always been prone to giving up the long ball. Even when he was pitching at a level not seen since Bob Gibson, or perhaps even better given his era, Pedro gave up a lot of long balls. As long as he is not letting people on base, it doesn’t really matter.

    Comment by Alireza — November 4, 2009 @ 3:57 pm

  4. Johan Santana has the same exact problem. I think it has something to do with their best pitches being relatively straight (changeups and fastballs).

    Comment by thehemogoblin — November 4, 2009 @ 4:07 pm

  5. No, Pedro has not always been prone to the long ball. He led the league three times in fewest homers allowed per 9 innings.

    Comment by Steve — November 4, 2009 @ 4:59 pm

  6. Thanks for beating me to that, Steve. Pedro has always been something of a fly ball pitcher, but that doesn’t necessarily mean lots of home runs. Especially not when you’re striking out 12 or 13 batters per nine innings and generating lots of infield flies (though we don’t have data on that for his best years).

    Comment by Mark Runsvold — November 4, 2009 @ 5:43 pm

  7. How do you post pictures in the comments?

    Comment by vivaelpujols — November 5, 2009 @ 4:03 am

  8. Use the normal html img tags.

    Comment by Dave Allen — November 5, 2009 @ 9:38 am

  9. I believe the pitch Matsui hit out was a 2 seamer that ran back over the plate.

    Good article.

    Comment by MarkS — November 5, 2009 @ 11:02 am

  10. great AB.

    Pedro must wake up in cold sweats with nightmares of pitching to Matsui in YS….

    Comment by Steve — November 5, 2009 @ 12:38 pm

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