Washington Nationals
Although they have not thrown an MLB pitch in 2024, Allen Webster threw 2,298 pitches that were tracked by the PITCHf/x system between 2011 and 2019, including pitches thrown in the MLB Regular Season and Spring Training. In 2019, they relied primarily on their Slider (88mph) and Fourseam Fastball (95mph), also mixing in a Change using a Circle Change grip (88mph). He also rarely threw a Sinker (92mph).
In 2019, compared to other RHP:
Their slider is thrown extremely hard, has exceptional depth, generates more whiffs/swing compared to other pitchers' sliders, has short glove-side cut and results in somewhat more groundballs compared to other pitchers' sliders. Their fourseam fastball has heavy sinking action, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' fourseamers, has slightly above average velo and has slightly less natural movement than typical. Their change using a circle change grip generates an extremely high number of swings & misses compared to other pitchers' changeups, is much firmer than usual and results in more flyballs compared to other pitchers' changeups. Their sinker (take this with a grain of salt because they've only thrown 4 of them in 2019) is basically never swung at and missed compared to other pitchers' sinkers, is an extreme flyball pitch compared to other pitchers' sinkers, has less armside run than typical and has some natural sinking action.