Although they have not thrown an MLB pitch in 2023, Reiver Sanmartin threw 1,212 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 Change (85mph), Slider (82mph) and Sinker (91mph), also mixing in a Fourseam Fastball (91mph).
In 2022, compared to other LHP:
His change dives down out of the zone, generates a very high amount of groundballs compared to other pitchers' changeups, is much firmer than usual and has slight armside fade. His slider has short glove-side cut and results in somewhat more flyballs compared to other pitchers' sliders. His sinker has heavy sinking action, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sinkers and has slight armside run. His fourseam fastball has heavy sinking action, has essentially average velo, results in somewhat more flyballs compared to other pitchers' fourseamers and has slight armside run.