St. Louis Cardinals
Riley O'Brien has thrown 3,617 pitches that have been tracked by the PITCHf/x system between 2021 and 2026, including pitches thrown in the MLB Regular Season and Spring Training. In 2026, they have relied primarily on their Sinker (98mph), Slider (84mph) and Cutter (91mph). He also rarely throws a Change (91mph).
In 2026, compared to other RHP:
Their sinker generates an extremely high number of swings & misses compared to other pitchers' sinkers, has heavy sinking action, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sinkers, is thrown at a speed that's borderline unfair and has an obvious tail. Their slider sweeps across the zone, has exceptional depth and is an extreme flyball pitch compared to other pitchers' sliders. Their cutter has heavy sink, is an extreme flyball pitch compared to other pitchers' cutters, has well above average velo and has strong cutting action. Their change (take this with a grain of salt because they've only thrown 1 of them in 2026) is thrown extremely hard, is basically never swung at and missed compared to other pitchers' changeups, has an obvious armside fade, results in more flyballs compared to other pitchers' changeups and has some natural sink to it.