Although they have not thrown an MLB pitch in 2023, Nick Nelson threw 2,220 pitches that were tracked by the PITCHf/x system between 2020 and 2022, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2022, they relied primarily on their Fourseam Fastball (96mph) and Change (88mph), also mixing in a Slider (88mph) and Cutter (92mph). He also rarely threw a Curve (79mph).
In 2022, compared to other RHP:
His fourseam fastball has well above average velo, results in somewhat more flyballs compared to other pitchers' fourseamers and has slightly less natural movement than typical. His change is much firmer than usual, has slight armside fade and has some natural sink to it. His slider is much harder than usual and has some two-plane movement. His cutter is a real worm killer that generates an extreme number of groundballs compared to other pitchers' cutters, generates a high number of swings & misses compared to other pitchers' cutters, has well above average velo and has some natural sink. His curve (take this with a grain of salt because he's only thrown 4 of them in 2022) generates an extremely high number of swings & misses compared to other pitchers' curves, results in more flyballs compared to other pitchers' curves and has a sharp downward bite.