Boston Red Sox
Seth Martinez has thrown 4,370 pitches that have been tracked by the PITCHf/x system between 2021 and 2026, including pitches thrown in the MLB Regular Season and Spring Training. In 2026, they have relied primarily on their Slider (79mph) and Fourseam Fastball (90mph), also mixing in a Sinker (90mph), Cutter (86mph) and Change (84mph).
In 2026, compared to other RHP:
Their slider comes in below hitting speed, sweeps across the zone, results in more flyballs compared to other pitchers' sliders and has less than expected depth. Their fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has heavy sinking action, has below average velo and results in somewhat more groundballs compared to other pitchers' fourseamers. Their sinker has heavy sinking action, is basically never swung at and missed compared to other pitchers' sinkers, results in somewhat more flyballs compared to other pitchers' sinkers and has slightly below average velo. Their cutter is an extreme flyball pitch compared to other pitchers' cutters, has slightly below average velo and has some natural sink. Their change dives down out of the zone and results in somewhat more groundballs compared to other pitchers' changeups.