Although they have not thrown an MLB pitch in 2023, César Valdez threw 3,804 pitches that were tracked by the PITCHf/x system between 2010 and 2022, including pitches thrown in the MLB Regular Season and Spring Training. In 2022, they relied primarily on their Change (78mph), also mixing in a Sinker (85mph), Fourseam Fastball (85mph) and Slider (77mph).
In 2022, compared to other RHP:
His change comes in below hitting speed, dives down out of the zone and has slight cut action. His sinker is so slow that it is substantially gravitational and has heavy sinking action. His fourseam fastball comes in below hitting speed, has heavy sinking action and has slight armside run. His slider comes in below hitting speed, is basically never swung at and missed compared to other pitchers' sliders and has some two-plane movement.