Seattle Mariners
George Kirby has thrown 12,607 pitches that have been tracked by the PITCHf/x system between 2022 and 2026, including pitches thrown in the MLB Regular Season and Spring Training. In 2026, they have relied primarily on their Slider (87mph), Fourseam Fastball (97mph) and Sinker (97mph), also mixing in a Curve (84mph) and Change (89mph). He also rarely throws a Cutter (93mph) and Splitter (86mph).
In 2026, compared to other RHP:
Their slider sweeps across the zone, has exceptional depth and is much harder than usual. Their fourseam fastball has heavy sinking action, is blazing fast and generates more whiffs/swing compared to other pitchers' fourseamers. Their sinker is thrown at a speed that's borderline unfair, has slight armside run and has some natural sinking action. Their curve is thrown extremely hard, has an exceptional bite, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' curves and generates fewer whiffs/swing compared to other pitchers' curves. Their change is thrown extremely hard, results in somewhat more flyballs compared to other pitchers' changeups, has slight armside fade and has some natural sink to it. Their cutter is thrown at a speed that's borderline unfair, results in more flyballs compared to other pitchers' cutters and has little cutting action. Their splitter (take this with a grain of salt because they've only thrown 5 of them in 2026) is basically never swung at and missed compared to other pitchers' splitters, is an extreme flyball pitch compared to other pitchers' splitters, has some natural sink to it and is slightly firmer than usual.