Although they have not thrown an MLB pitch in 2023, Matt Brash threw 1,555 pitches that were tracked by the PITCHf/x system in 2022, including pitches thrown in the MLB Regular Season and Spring Training. In 2022, they relied primarily on their Slider (87mph) and Fourseam Fastball (97mph), also mixing in a Curve (85mph). He also rarely threw a Change (86mph).
In 2022, compared to other RHP:
His slider sweeps across the zone, generates more whiffs/swing compared to other pitchers' sliders, is much harder than usual and has some two-plane movement. His fourseam fastball is a real worm killer that generates an extreme number of groundballs compared to other pitchers' fourseamers, is blazing fast, generates more whiffs/swing compared to other pitchers' fourseamers, has some natural sinking action and has slight armside run. His curve is thrown extremely hard and has slight glove-side movement. His change (take this with a grain of salt because he's only thrown 14 of them in 2022) is basically never swung at and missed compared to other pitchers' changeups, has an obvious armside fade, results in more flyballs compared to other pitchers' changeups, is slightly firmer than usual and has some natural sink to it.