The veteran Dominican threw just 5.2 innings in 2019 with the Giants after a trade from the Reds where he sported a ghastly 6.09 ERA in just 34 innings of work. He mainly threw three pitches and the changeup was the best of the bunch. He limited hitters to a .258 xWOBA, whilst achieving a 32.9 whiff%. He will do well to stay relevant in 2020 as his stuff just is too hittable these days.
Peralta still gets good velocity on his sinker. However, hitters slugged .730 in 2019 as its lack of movement was too apparent.
The slider is Peralta’s most effective pitch to lefties. He threw it 190 times to left handers compared to just 56 to righties. It has a nice 42.0 whiff% and swings low and away to lefties for the Ks.
The changeup was the most used pitch in Peralta’s repertoire in 2018, with a 30.22% usage rate. It featured a strong 18.4% swinging-strike rate, which contributed to limiting opposing batters to just a 65.5% contact rate. A quality 53.4% ground-ball rate unfortunately couldn’t help control opponents BABIP wise, and the result was a .316 batting average against. It was worth a 0.8 pVal.
Peralta’s two-seam fastball was notably much more effective when thrown outside the zone, as evidenced by an O-Contact rate of 63.6% compared to a 92.7% Z-Contact rate. With that in mind, his 46.9% zone rate contributed to a .257/.480/.286 slash line for opponents. It resulted in a -2.6 pVal.
Averaging 95.7 mph in 2018, Peralta’s four-seam fastball was his least effective pitch in terms of pVal with a -3.6 mark. A 91.7% contact rate against the pitch along with a .357 BABIP led to a .348 batting average surrendered.
Peralta threw his slider about 20.65% of the time in 2018 and it surrendered a .256/.293/.385 slash line to opponents. It took some steps back in 2018 in terms of swinging-strike rate, falling to a 10.6% mark, which may be a result of a much higher 51.1% zone rate in 2018. All told, it was worth a -1.7 pVal.