Boston Red Sox
Although they have not thrown an MLB pitch in 2023, John Schreiber threw 1,624 pitches that were tracked by the PITCHf/x system between 2019 and 2022, including pitches thrown in the MLB Regular Season and Spring Training. In 2022, they relied primarily on their Slider (82mph), Fourseam Fastball (95mph) and Sinker (93mph), also mixing in a Change (89mph).
In 2022, compared to other RHP:
His slider sweeps across the zone, generates more whiffs/swing compared to other pitchers' sliders and results in somewhat more flyballs compared to other pitchers' sliders. His fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has heavy sinking action, has slight armside run and has slightly above average velo. His sinker generates an extremely high number of swings & misses compared to other pitchers' sinkers, has heavy sinking action, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sinkers, has slight armside run and has slightly above average velo. His change is thrown extremely hard, dives down out of the zone, generates a very high amount of groundballs compared to other pitchers' changeups, generates fewer whiffs/swing compared to other pitchers' changeups and has slight armside fade.