Brewers prospect Jacob Misiorowski unleashed the fastest pitch ever thrown by a starting pitcher, clocking 105.5 mph against the Cubs.
Jacob Misiorowski just proved why velocity still matters in MLB. 5 mph fastball during a start against the Cubs, setting a new record for the fastest pitch ever recorded by a starting pitcher in the pitch tracking era. 1 mph held by Aroldis Chapman in 2010.
Misiorowski didn’t just touch triple digits—he sprinted past them, making history with every pitch. The pitch came in the first inning of a game at Wrigley Field, where Misiorowski was working in relief. The velocity wasn’t an outlier; it was part of a dominant outing where he consistently sat in the upper 90s and touched triple digits multiple times.
The Cubs’ hitters had no answer. 5 mph offering alone would’ve been enough to rewrite the record books, but Misiorowski’s ability to pair that heat with command and secondary stuff suggests he’s not just a one-pitch wonder. The record-setting pitch was measured by Statcast, the league’s pitch tracking system that has documented velocity since 2015.
1 mph, thrown by Aroldis Chapman in 2010 while he was still with the Reds. 4 mph, a margin that sounds small but represents a generational leap in starter velocity. 5 mph is wider than it appears; in a sport where milliseconds separate success from failure, that extra pop can turn a borderline fastball into a swing-and-miss weapon.
The Brewers’ decision to use Misiorowski in relief during this outing wasn’t happenstance. The organization has been cautious with his workload, mindful of the innings limits that have stunted other high-velocity arms. By unleashing him in a high-leverage spot against a division rival, Milwaukee sent a message: this arm isn’t just a prospect—it’s a potential game-changer.
The Cubs, meanwhile, were left scrambling. Their lineup, built to feast on breaking balls and changeups, found itself helpless against a fastball that arrived faster than their eyes could process. Velocity inflation has been a defining trend in MLB over the past decade, but Misiorowski’s record-setting pitch underscores a critical shift: starters are now joining the arms race.
Historically, triple-digit heat was the domain of relievers, who could dial it up for an inning or two without the wear of a full start. Misiorowski’s ability to sustain 98-100 mph deep into games challenges the old assumption that starters must rely on deception over pure power. This isn’t just about one pitch—it’s evidence that the starter’s arsenal is evolving, and hitters are running out of time to adjust.
The physics behind Misiorowski’s fastball are as compelling as the numbers. Research from Driveline Baseball shows that a 1 mph increase in fastball velocity correlates with a 3% drop in bat speed for hitters. 5 mph, Misiorowski’s pitch doesn’t just beat batters—it disrupts their timing before the ball even leaves his hand.
4 seconds. This is the kind of advantage that can’t be coached away overnight. Brewers pitching coach Chris Hook called the outing “special,” noting that Misiorowski’s fastball plays even harder than the radar gun suggests.
“The way it jumps out of his hand and the life on it—it’s not just about the number,” Hook said. ” Cubs hitting coach Greg Brown echoed the sentiment, admitting his team was caught off guard. “You don’t see many 105 mph fastballs in a starter’s arsenal,” Brown said.
” What’s next: Misiorowski will continue to build on this performance as he climbs the Brewers’ rotation depth chart. The organization is expected to monitor his workload closely, but the talent is undeniable. If he can sustain this level of dominance, he won’t just be a reliever—he could be the Brewers’ next ace.
The league better start preparing. Teams will now scout him with a microscope, and hitters will adjust their approach in the batter’s box. The record won’t last long if Misiorowski keeps this up. Read at ESPN
Velocity is the ultimate equalizer in MLB, and Misiorowski’s 105.5 mph fastball isn’t just a highlight—it’s a warning. The modern game rewards arms that can overpower hitters, and Misiorowski’s record-setting pitch proves he’s operating in a league of his own. For hitters, it’s a nightmare scenario: a starter who can touch triple digits while maintaining command. For teams, it’s a blueprint for how to build a rotation in 2024 and beyond. The record won’t last long if Misiorowski keeps this up, and the ripple effects could reshape how pitchers are developed and deployed.
ESPNespn.comBy Jesse RogersJun 27, 4:57 AMen
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