Milwaukee Brewers starting pitcher Jacob Misiorowski threw a 105.5 mph fastball on June 7, 2026, setting a new MLB record for starting pitchers [1].
This achievement marks a significant milestone in the pitch-tracking era, as Misiorowski surpasses his own previous velocity benchmarks to become the fastest starter in league history [1], [2].
The record-breaking pitch occurred at Coors Field in Denver, Colorado, during a game against the Colorado Rockies [2], [3]. The high altitude of the venue is often associated with increased velocity peaks for pitchers [2]. This specific throw of 105.5 mph broke the previous record for the hardest pitch thrown by a starter [1], [3].
Misiorowski has demonstrated consistent high-velocity performance throughout the current season. He has thrown 28 pitches that met or exceeded 103 mph [4]. While he continues to push the boundaries of speed, he also recorded a subsequent high-velocity pitch of 104.5 mph on June 12, 2026 [5].
Some reports have noted that Misiorowski is now chasing the all-time mark held by Aroldis Chapman [1]. While there are conflicting reports regarding whether certain pitches tied or broke existing records, the 105.5 mph mark is recognized as a new personal and professional high for a starting pitcher [1], [2].
The Brewers' pitcher, often referred to as the "human howitzer," continues to redefine the expectations for velocity from the mound [1]. His ability to maintain such speeds over multiple starts distinguishes him from traditional relief pitchers, who typically hold the highest velocity records.
“Jacob Misiorowski threw a 105.5 mph fastball, breaking the record for the fastest pitch by a starter.”
The emergence of starting pitchers reaching velocities previously reserved for closers suggests a shift in player development and training. By breaking the pitch-tracking era record, Misiorowski is pushing the physical limits of the position, though the influence of Coors Field's altitude remains a key factor in achieving such peak numbers.
