SI has a story up about Hughes' transformation since coming to the Twins. A stat really jumped out at me, in May, Hughes has thrown 90 percent of his pitches as either fastballs or cutters.
For much of his time in New York, Hughes said, his repertoire was a work in progress, as he struggled to supplement his fastballs with the breaking balls that he thought every successful starter needed. For a while, he was throwing a lot of curveballs; then he tried a lot of sliders. This year, though, especially after his first three starts, he decided that it no longer made sense to pitch in the way he thought an effective starter had to. Instead, Hughes figured that he might try pitching as he had during his most successful spell as a Yankee, back in 2009 when he was primarily a setup man to Mariano Rivera; in 44 games in that role that season, he had an ERA of 1.40
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It is a nice article, hopefully Hughes can continue this success.