A blazing sinker that is able to touch 102 mph, Castillo’s was very effective as a groundball inducing pitch. Like most sinkers it featured a higher BABIP against while allowing a ton of contact. It deserved a better fate as its xwOBA was lower than his wOBA so his defense will be key in its success in the future.
The Rays love guys who can sling a slider and Castillo is no different. His slider has great movement on it and loves to use it away on righties to get a swing outside of the zone. He was able to get 10 pVAL on it in 2019 and it should continue to be good into the future.
Is it a four-seam? Is it a sinker? Whatever you decide, there’s no arguing Castillo’s fastball has a sick amount of arm-side movement to it. (We think it’s a sinker, by the way.) While the velo is there — it frequently touches 100 — the command usually isn’t making this pitch either too hittable or too off the plate. If he can command this a bit better, it will help set get him ahead in counts to throw his fantastic slider
This is Castillo’s bread-and-butter pitch, and for good reason: It’s virtually unhittable. The pitch has a ton more horizontal break to it than the average slider, induces a lot of whiffs, and limited hitters to a .106 BAA in 2018. The pitch was not only the best slider thrown by an RP, it was the 13th-best slider by pVal in all of baseball