Although they have not thrown an MLB pitch in 2023, Aaron Ashby threw 2,470 pitches that were tracked by the PITCHf/x system between 2021 and 2022, all of them occuring in the MLB Regular Season. In 2022, they relied primarily on their Sinker (96mph), Slider (84mph) and Change (89mph), also mixing in a Curve (80mph). He also rarely threw a Fourseam Fastball (96mph).
In 2022, compared to other LHP:
His sinker is thrown at a speed that's borderline unfair, generates a high number of swings & misses compared to other pitchers' sinkers, has less armside run than typical and has some natural sinking action. His slider sweeps across the zone and has exceptional depth. His change is thrown extremely hard, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' changeups and dives down out of the zone. His curve has an exceptional bite, generates a very high amount of groundballs compared to other pitchers' curves and is much harder than usual. His fourseam fastball is blazing fast, has some natural sinking action, results in somewhat more groundballs compared to other pitchers' fourseamers and has slightly less natural movement than typical.