Edwin Jackson Is In Love With His Slider
There is an old adage when it comes to pitching that you have got to establish your fastball first and foremost. The other pitches are deemed ‘secondary pitches’ for a reason.” Apparently, Edwin Jackson has little use for this piece of baseball wisdom, as 2011 has seen him throw his slider more than ever in his career. Last night’s World Series Game 4 was no exception, as Jackson offered the pitch 46 times in his 109 pitches (42.2%) – nearly identical to his Pitch F/X slider percentage of 42.3 in 2011. Jackson’s reliance on the slider last night led to his seven walks – so, despite that he allowed just three hits, Tony LaRussa was forced to relieve him with Mitchell Boggs in the 6th inning. Boggs will not likely be available tonight in the pivotal Game 5 as he threw 29 pitches – his third highest total since August 27th.
Jackon’s slider usage is curious. A picther who has never been labeled a “command guy”, Jackson is one of the hardest throwers in baseball, with his fastball checking in at 94.7 MPH in 2011. For someone who has struggled with his command, Jackson has increasingly utilized a pitch that can generate sharp movement on both planes. This season, Jackson offered the slider in high percentages with two strikes, and regardless of the number of balls. When he was ahead in the count at 0-2 and 1-2, he offered the pitch 56% and 54% of the time, respectively. With the count even or full, those percentages dropped to just 53 and 49. For contrast, Clayton Kershaw, who produced the gold standard for slider usage in 2011, offered his slider in 3-2 counts 34% of the time. Kershaw’s wSL came in at 22.8 in 2011, while Jackson’s checked in at just 1.8 with 30 starting pitchers in MLB generating more value from their slider than Jackson, and just two – Ervin Santana and Bud Norris – offering it at a higher rate.