Peters’ change is his best secondary pitch, throwing it way more often than his previous two seasons. He started getting more whiffs and getting batters to swing out of the zone way more often (jumping from 25% to over 40% O-swing).
The curve is Peters’ go-to breaking pitch, taking off a ton of velocity to throw it in the mid-70s. He rarely gives up fly balls off this pitch, but a 34.5% line drive rate is problematic. He does not get many swings and misses, resulting in good amount of contact in and out of the zone. The curve does fine but could be better.
Peters doubled his innings than any other season in 2019, throwing his 91 mph fastball almost 600 times. Things did not go well. He gave up 13 dingers with a 206 wRC+ against with almost half the balls hit being fly balls.
Peters has been working on a slider, only throwing it five times in 2018, but brought it out more often this past year. It still needs work as it had a 1.053 OPS against but a 13.6% swinging strike with a 38.9% O-swing is somewhat promising.
Peters’ fastball is fairly straight and down the middle, with below-average velocity. Because he peppered the ball in the zone quite a bit, it led to quite a bit of trouble and a .309 batting average against. His average exit velocity is higher than 90 mph alongside a 16-degree launch angle, which is a a great when you’re hitting but not a quality of contact you’re looking for as a pitcher.
Peters goes to the curveball quite often, especially when ahead in the count. However, it is not a good whiff pitch, only drawing 6.4% swinging strikes. The only thing that he does well with the pitch is draw a 55.9% ground-ball rate, and with a .353 BABIP, it’s still hurting him.
Peters’ changeup increased its horizontal movement and held batters to a .200 batting average against for decent results. He kept most batted balls on the ground, but when batters did get the ball in the air, they fared extremely well with a .446 WOBA against.