Peralta almost never throws his changeup: 17 pitches over 85 innings. It may be he just doesn’t have a feel for the pitch yet.
Peralta’s only other main pitch (that’s only thrown 20.5% of the time, which is crazy) is his curveball. It doesn’t get as many swings and misses on it as much as you would want for a curveball but with better placement (more down, away etc.) could become a good strikeout weapon.
Peralta took some steps forward in 2019, pumping his velocity up a few ticks. Despite the increase in velocity and whiffs, he fell victim to the home run. In only 25% more plate appearances than the year prior, his home runs more than doubled to 12. But a 94 mph fastball with a 14% swinging strike rate from a 23-year-old is promising.
Peralta threw his 91 mph fastball over 1,000 times in 2018, and it was an effective pitch. While he did walk batters at a 14% rate, he also struck them out at a 29% clip and held opponents to an 8% HR/FB rate. Peralta’s heater showed good vertical and horizontal movement, which reduced the impact of the lack of elite velocity on the pitch.
The curveball was Peralta’s strikeout pitch by percentage in 2018. He struck out batters at a 34% clip with it, mainly due to the 76 mph speed and the good vertical depth he got on the curve. He did allow a .193 ISO and 21.4% HR/FB rate, which caused the pitch to be graded out as just above average overall.
Peralta only threw this pitch 39 times in 2018, and it graded out as average. He generated ground balls at a 62.5% rate with it and did a good job of limiting contact of any type. He did not generate a strikeout with the pitch, but it could become a valuable option in 2019.