McGee’s four-seamer has pretty average velo at 93.5 mph, but gets better run than most. He works with the fastball predominantly, at 80% usage, but is more effective against lefties, who he works away. He has good success on the shadows of the zone and could benefit from working there a little more often.
When you look at the plot of McGee’s sliders, it would seem he has no idea where the pitch is going when he lets it go, and the 26% zone rate in 2019 would agree. However, when it works, it works. He managed a 38% whiff rate with it last year, and it was nearly unhittable when he buried it below the zone.
McGee’s four-seamer suffered the fate of a little less velocity with a lot less movement, which resulted in a massive drop in pVal (13.4 in 2017 to -7.8 in 2018). From the .262 ISO, to the 20.5 HR/FB%, the pitch just got hammered.
McGee played with a pair of breaking balls in 2018, ultimately putting this slower curveball on the shelf in favor of his slider. They are arguably the same pitch that evolved through the year, though McGee had little success when featuring this slower breaking ball.
When McGee had a harder breaker, it turned into this slider that did a better job of getting batters to chase out of the zone — 44% O-Swing — and swing-and-miss at an impressive 23% clip.