Over at FanGraphs they’re having fun with the new splits, posting trend after trend. Buried under a few such posts, Matthew Carruth took a look at which pitchers saw more speed on their fastballs in 2009 over 2008, and which ones lost the most velocity. No Yankees made the gains list, but two made the losses. Mariano Rivera lost 1.3 miles per hour on his cutter, though it didn’t show in the results. Joba Chamberlain lost more velocity than any pitcher with more than 50 IP in 2008 and 2009, by 2.5 mph. Part of the drop comes because Joba started 2008 in the bullpen and was airing out 97 mph fastballs before settling in at 94-95 in the rotation. But we did notice a difference this year. Joba’s average fastball clocked 92.5 mph. He can succeed with that speed if he continues to hone his curveball, but clearly he’s a more effective pitcher with a little more juice on ol’ number one.
River Ave. Blues » Joba lost more fastball velocity than any other pitcher