Boston Red Sox
Seth Martinez has thrown 4,188 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 Sinker (90mph), also mixing in a Fourseam Fastball (90mph), Cutter (87mph) and Change (83mph).
In 2026, compared to other RHP:
Their slider (take this with a grain of salt because they've only thrown 8 of them in 2026) 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 sinker (take this with a grain of salt because they've only thrown 6 of them in 2026) has heavy sinking action, is basically never swung at and missed compared to other pitchers' sinkers, is an extreme flyball pitch compared to other pitchers' sinkers, has surprisingly little armside run and has slightly below average velo. Their fourseam fastball (take this with a grain of salt because they've only thrown 2 of them in 2026) has heavy sinking action, is basically never swung at and missed compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers and has below average velo. Their cutter (take this with a grain of salt because they've only thrown 2 of them in 2026) is basically never swung at and missed compared to other pitchers' cutters, is an extreme flyball pitch compared to other pitchers' cutters, has slightly below average velo and has some natural sink. Their change (take this with a grain of salt because they've only thrown 1 of them in 2026) is basically never swung at and missed compared to other pitchers' changeups, dives down out of the zone and results in more flyballs compared to other pitchers' changeups.