Although they have not thrown an MLB pitch in 2023, Trevor Williams threw 11,803 pitches that were tracked by the PITCHf/x system between 2016 and 2022, including pitches thrown in the MLB Regular Season and Spring Training. In 2022, they relied primarily on their Fourseam Fastball (91mph), also mixing in a Slider (82mph), Sinker (89mph) and Change (84mph). He also rarely threw a Curve (78mph).
In 2022, compared to other RHP:
His fourseam fastball has heavy sinking action and has slightly below average velo. His slider has short glove-side cut. His sinker generates an extremely high number of swings & misses compared to other pitchers' sinkers, has heavy sinking action, has below average velo, results in somewhat more groundballs compared to other pitchers' sinkers and has slight armside run. His change results in somewhat more flyballs compared to other pitchers' changeups and has some natural sink to it. His curve has little depth and results in somewhat more flyballs compared to other pitchers' curves.