San Francisco Giants
Although they have not thrown an MLB pitch in 2024, Sergio Romo threw 11,916 pitches that were tracked by the PITCHf/x system between 2008 and 2023, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2023, they relied primarily on their Slider (75mph), also mixing in a Sinker (82mph).
In 2023, compared to other RHP:
Their slider (take this with a grain of salt because they've only thrown 9 of them in 2023) comes in below hitting speed, is basically never swung at and missed compared to other pitchers' sliders, sweeps across the zone and is an extreme flyball pitch compared to other pitchers' sliders. Their sinker (take this with a grain of salt because they've only thrown 2 of them in 2023) is so slow that it is substantially gravitational, has heavy sinking action, is basically never swung at and missed compared to other pitchers' sinkers, has an obvious tail and is an extreme flyball pitch compared to other pitchers' sinkers.