But Jackson’s slider saw the most improvement. He threw it about one in every four pitches with Arizona at an average of 85.4 miles per hour, and it was a few ticks above average at 0.56 w/RC. With the White Sox, Jackson threw his slider 36.1 percent of the time at an average of 87.6 miles per hour—and, not surprisingly, the pitch was worth 2.28 runs above average per 100 pitches.
March 29, 2011
JJ looks at Edwin Jackson’s slider
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