Colorado Rockies
Although they have not thrown an MLB pitch in 2026, Seth Halvorsen threw 1,128 pitches that were tracked by the PITCHf/x system between 2024 and 2025, including pitches thrown in the MLB Regular Season and Spring Training. In 2025, they relied primarily on their Fourseam Fastball (100mph), Change (91mph) and Slider (89mph).
In 2025, compared to other RHP:
Their fourseam fastball is a real worm killer that generates an extreme number of groundballs compared to other pitchers' fourseamers, is thrown at a speed that's borderline unfair, generates more whiffs/swing compared to other pitchers' fourseamers, has some natural sinking action and has slight armside run. Their change is thrown extremely hard and dives down out of the zone. Their slider is thrown extremely hard, has primarily 12-6 movement and has some two-plane movement.