"He's not scared," Showalter said. "This is a guy who comes up and attacks people. His repertoire and his approach really don't play out of the 'pen. It's kind of like, guys have got to see him. Guys up here see so many right-handed lineups, left-handed pitchers do, so the changeup [plays]. And the player development group has done a great job with his slider. [Pitching coach] Roger [McDowell] started working on it in spring, and that's given him another look that he didn't have. Anytime you can make some good left-handed hitters look uncomfortable with the slider, that was something he didn't have."