Brewers rookie Misiorowski fires fastest starter pitch on record, dominates Rockies
Jacob Misiorowski hit 103.7 mph, the fastest starter pitch on record, then worked seven strong innings at Coors Field. The outing raised the ceiling and the durability question.
Jacob Misiorowski pushed the starter velocity ceiling to a place no one had seen before, unleashing a 103.7 mph fastball in the third inning against Kyle Karros and turning Coors Field into a showcase for the modern power pitcher. The pitch, low and outside, was the fastest tracked offering by a starting pitcher since pitch tracking began in 2008.
The Milwaukee right-hander did not stop at one eye-popping number. He threw 52 pitches at 100 mph or higher, the second-most in the pitch-tracking era, and set a record with 45 pitches at 101 mph or higher. In seven innings, he allowed only an unearned run, struck out eight and lowered his ERA to 1.50 in Milwaukee’s 7-1 win over the Rockies. At 6-foot-7 and 201 pounds, the 24-year-old from Blue Springs, Missouri, looked less like a novelty act than the latest proof that major league pitching development has found ways to make extreme velocity hold up deep into starts.
That is where the story moves beyond the radar gun. Misiorowski was still at 91 pitches in the seventh with runners at the corners when he kept telling catcher William Contreras no to a mound visit. He then locked eyes with Brewers manager Pat Murphy and finished the inning. Murphy later said, “The middle of the order was up, and he wanted to finish what he started.” It was a small but revealing scene: a starter pitching with the urgency of a late-inning reliever, but doing it for seven full innings in one of baseball’s most difficult parks.
Misiorowski’s outing also put his unusual profile in sharper focus. Milwaukee drafted him in the second round in 2022 with the 63rd overall pick, and he debuted on June 12, 2025. Since then, he has already been clocked at 104 mph twice in Game 2 of the 2025 NLDS against the Cubs, and his previous 57 pitches at 100 mph or higher on May 25, 2026, had already set the bar for raw power. His edge is not only speed, but extension, which gives hitters less time to react as the ball explodes out of his hand.
Only Aroldis Chapman’s 105.8 mph pitch on September 24, 2010, remains the fastest tracked pitch overall, with Ben Joyce at 105.5 mph and Jordan Hicks at 105 mph among the recent benchmarks. Misiorowski is still far from the absolute peak, but his start in Denver showed how far the game has pushed the velocity frontier. It also sharpened the bigger question hanging over baseball’s newest power arms: whether this race to throw harder is building durable stars, or simply asking bodies to survive a level of stress the sport keeps normalizing.
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