After A Strenuous First Start, It's Apparent Brewers Starter DL Hall Is A Work In Progress

Agree that Hall is going to be a work in progress throughout the season, my only real hope is that he stays healthy enough for say 25 GS | 115 IP and I’d take whatever results come along with it.

Think the concern over his fastball velocity might be a lil overblown given the early season weather and starter vs reliever effort levels.

Was also reminded of this blurb from Matthew Trueblood’s ST coverage breaking down how Hall’s heater doesn’t necessarily require elite velocity to be an effective pitch…

I don't like to default to Stuff+ or PitchingBot, a pair of models designed to boil down the quality of a given offering to a single number using data about release point and movement. I think pitching is much more nuanced and interesting than that. I do find it fascinating, though, that those two models disagree sharply about Hall's fastball. Somewhat famously, multiple outlets who put scouting (non-quantitative) grades on players gave Hall an 80 (the very top of the scale) to the lefty's heater. 

PitchingBot, which is on the scouting scale (20-80), comes fairly close to affirming that, at 68. It ranked Hall's as the 20th-best fastball in baseball last year, of 727 qualifying pitchers. Stuff+, though, is much less impressed. That number is scaled to 100, where that figure is average and higher is better. Hall comes in at just 101, above average but far below any standard for excellence. He ranks 232nd in fastball Stuff+.

I bring this up because, when you watch Hall, it's not hard to see what the scouts saw when they slapped that high grade on him. The fastball explodes on the hitter. It's just not easy to put a finger on why that is.

I looked up Hall's percentile ranks in many categories, among lefties who threw at least 200 four-seamers, for 2023. As it turns out, while he doesn't excel in terms of sheer movement or sheer velocity, he's extraordinary in many other regards.

We're certainly used to elite fastballs grades being given to fastballs with elite velocity, and failing that, we at least expect something weird to be going on in terms of horizontal or vertical movement. Hall is more subtle than that. It's a weird horizontal angle, but also a low release point, which gives him an extreme vertical approach angle, too. His very good extension lets the raw velocity play up, and he changes speeds on the heat much more than most pitchers do. That's an especially intriguing tidbit, for such a young pitcher. 

In the context of a short Cactus League outing, it's impossible to distinguish adding and subtracting on the fastball from tiring in a second inning of work, but I thought he seemed to be doing the former, not the latter, on Sunday. Changing speeds and giving hitters such a tricky look makes up for a lot of other things, and with Hall's good (though not dominant) power, it becomes a deadly cocktail in a hurry. In a short outing Sunday, he showed everything from 93.7 MPH to 96.9 on the fastball, with accompanying changes in spin rate. That touch might be what sets the pitch apart.