Seattle Mariners
Gregory Santos has thrown 2,249 pitches that have been tracked by the PITCHf/x system between 2021 and 2025, including pitches thrown in the MLB Regular Season, Spring Training and Fall/Winter Ball. In 2025, they have relied primarily on their Slider (89mph) and Sinker (97mph). He also rarely throws a Fourseam Fastball (95mph).
In 2025, compared to other RHP:
Their slider is thrown extremely hard, generates fewer whiffs/swing compared to other pitchers' sliders, results in many more groundballs compared to other pitchers' sliders and has some two-plane movement. Their sinker generates an extremely high number of swings & misses compared to other pitchers' sinkers, is thrown at a speed that's borderline unfair, is an extreme flyball pitch compared to other pitchers' sinkers, has surprisingly little armside run and has some natural sinking action. Their fourseam fastball (take this with a grain of salt because they've only thrown 1 of them in 2025) 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, has much less armside movement than typical and has slightly above average velo.