Quick Mitch Keller thread:

Keller didn't really throw anything but his his fastball and slider in the first two innings but started throwing the hook more in innings three, four and five

He has a fastball in the 83rd percentile in velo and 85th percentile in spin. He should be throwing it up in the zone more. It was a 60 by FanGraphs every year until this year, where it is now a 55

His curveball was also always a 60 before this year. He's in the 85th percentile for spin, but only has 54% spin efficiency per Dr. Nathan's calculator. He gets good spin, but not as much movement. 17 whiffs/50 swings for a rate of 34%, about the 32.44% league average

His slider, which FanGraphs calls a 60, is also in the 85th percentile in spin. It has low spin efficiency (9.21%) but that's good for a slider. High spin, low efficiency means low vertical movement but more horizontal movement, as seen below

The slider got 43 whiffs on 90 swings, a rate of 47.78% compared to the league average of 36.16% (among pitchers >= 100 sliders). The pitch is good. The stuff is there to succeed

87.9 mph slider to strike Contreras out. It's good stuff and Keller did produce a 28.6% strikeout rate and 11.8% swinging strike rate, both above average

3.19 FIP
4.18 DRA (RA9 scale)

72 FIP-
85.8 DRA-

Keller's peripherals were there. The stuff is there. STEAMER has a projected 2.3 fWAR and ZiPS a 2.4 fWAR. That'd be a good rookie year. That's your 55 median projection. The stuff seems like there could be more (was a 60 in 2018)