Non-MLB
Although they have not thrown an MLB pitch in 2024, Saul Rivera threw 2,344 pitches that were tracked by the PITCHf/x system between 2007 and 2010, including pitches thrown in the MLB Regular Season and Spring Training. In 2010, they relied primarily on their Sinker (89mph) and Fourseam Fastball (88mph), also mixing in a Slider (84mph).
In 2010, compared to other RHP:
Their sinker is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sinkers, has surprisingly little armside run, has below average velo and has some natural sinking action. Their fourseam fastball comes in below hitting speed, generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has heavy sinking action, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' fourseamers and is straight as an arrow. Their slider (take this with a grain of salt because they've only thrown 15 of them in 2010) is an extreme flyball pitch compared to other pitchers' sliders, generates fewer whiffs/swing compared to other pitchers' sliders and has some two-plane movement.