Mills keeps his changeup out of the zone, and generally stays below the zone when trying to locate it. This is a nice compliment to his fastball which is usually up in the zone.
He is really good at locating his curve and can throw it in the zone at an effective rate. He keeps it sweeping away from righties in the bottom corner of the zone.
His biggest problem has to be his fastball velocity, but he keeps it up in the zone to decieve hitters without velocity.
Mills NEEDS to throw this slider more. In 2019 (small-sample size) it was elite with a 14.8% swinging-strike rate, 52% K-rate, .143 wOBA against and 87.5% groundball rate. Not your run of the Mills slider.
A somewhat enigmatic pitch, Mills’ fastball seems to be nothing special, but a 26% K-rate is nothing to sneeze at. A .387 wOBA, however, suggests that as the sample size grows, the pitch will be less effective.
Mills’ two-seamer proved to be a plus pitch in limited use in 2018, holding opponents to a .100 BAA. It’s not a swing-and-miss pitch, but it’s highly effective in inducing ground balls, and that’s what you’re looking for from a dipping pitch.
For a 22nd round pick, Mill’s changeup is pretty nasty. On only 57 pitches in 2018, he recorded 10 punchouts with the pitch, and held batters to a miniscule .077 BAA. If he finds himself on the big club, this pitch may well be his bread and butter.
Look at that baby move. Mills only threw his slider 40 times in 2018, but no one could hit it. Literally. He didn’t allow a single hit off the pitch, and it’s easy to see why. It’s a thing of beauty.
An afterthought in Mills’ repertoire, the curve is the only pitch that he struggled to throw for strikes. It may be a pitch that falls by the wayside as the rest of his offerings are far more effective and commanded far better.