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For various reasons Pelfrey’s ability to sustain this success was questioned. Despite the swinging strikes, he really didn’t strike anyone out. He put a ton of baserunners on but managed to wiggle out of jams by the skin of his teeth. Surely the wheels were ready to come off. And when the Detroit Tigers pounded him for 10 hits over four innings a few short weeks later, it felt as if the foreboding avalanche of regression would leave no survivors.
But then something unexpected happened: He didn’t regress. Mike Pelfrey went back out and threw 13 innings of 10 hit, two-run ball over his next two starts. Instead, he concluded Tuesday night’s victory over the Boston Red Sox tied with Edinson Volquez with a 2.77 ERA -- the 10th best in the American League. It is especially crazy considering his expected performance figures peg him to be around 4.50.
How has he continued to outperform performance indicators like xFIP? Nine starts is by no means an ample sample but the traits that Pelfrey demonstrated in April have rolled over into May.
In addition to the ERA (which should not be used in gauging the quality of a pitcher’s performance so stop using it), Pelfrey has managed to keep opposing hitters away from hard contact. According to ESPN/trumedia, he maintains a well-hit average of .103 -- this time 12th best in all of baseball. BaseballSavant.com’s batted ball velocity more or less confirms this, saying Pelfrey’s batted ball velocity of 87 mph is 18th among all qualified pitchers. Tons of contact but the vast majority of it is weak.
Pelfrey’s inclusion of the splitter has elevated his arsenal to a new level. It is lethal against left-handed hitters and has kept right-handers honest to some degree. Watch the movement it showed in his last start against Pittsburgh. This was a nasty pitch that incited a silly swing from the Pirates’ Pedro Alvarez:
http://i.imgur.com/sRa4T8a.gif
This season’s splitter has a lack of spin and that provides drag and drop. When thrown with similar arm speed as a fastball it can produce some head-shaking swings.
Pelfrey’s current .202 batting average against lefties is 10th lowest in baseball by a right-hander -- company that includes pitching elite like Felix Hernandez, Matt Harvey and Sonny Gray -- and that development undoubted coincides with his use of the splitter.
The other reason he has been able to achieve weak contact on a consistent basis is location and movement on his fastball. Over the previous two years with the Twins, Pelfrey’s low-90s fastball was mostly seen hovering over the middle of the plate. Now he is hitting the low corners of the zone with solid movement:
http://i.imgur.com/iAVcMwX.gif
The results have been his highest ground ball rate on the pitch since 2010 because hitters are unable to barrel it up.
While this may feel like an Arrested Development’s Ann moment, Mike Pelfrey has been good this season (“Him?”) and if he continues to twirl pitches the way he has while receiving competent infield defense behind him, he just might maintain throughout this surprising season. At the same time Pelfrey has outpaced his strand rate, benefited from the lowest batting average on balls in play of his career all while posting the second-lowest strikeout rate of his career -- there is room for regression.
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