Jacob Misiorowski breaks his own record again as quest for top velocity in MLB history continues

"It feels like every time he goes out there, he's breaking a record," said Milwaukee Brewers outfielder Garrett Mitchell about his flame-throwing teammate Jacob Misiorowski after last night's win over the Chicago Cubs.

That feeling that Mitchell and many Brewers fans share is understandable given the historic season that Miz is putting together in 2026. Entering last night's contest, Misiorowski held the record for the fastest pitch thrown by a starting pitcher in the pitch-tracking era (104.5 mph) -- a record he set during his dominant outing against the Philadelphia Phillies back on June 12. Before that, Misiorowski set the same record at Coors Field by throwing a fastball 103.7 mph. That pitch, however, broke a record that Misiorowski set himself back on May 8, in a game against the New York Yankees. Prior to that May 8 start, the fastest recorded pitch by a starter was 103.2 mph, thrown by then-St. Louis Cardinals right-hander Jordan Hicks back in July of 2022. However, on May 8, Miz threw a whopping seven pitches harder than 103.2, setting the tone for the rest of his season. To some extent, Miz does essentially break a record every time he takes the mound.

However, every time he sets a new velocity record, fans have a similar reaction: there's no way he can top it. And every time, Miz surpasses his previous high with a pitch that feels humanly impossible. Such was the case last night, when, during the first at-bat of the game, Miz unleashed a 105.5 mph fastball, besting his previous high by an entire mile per hour.

Misiorowski didn't realize he had hit 105.5 mph until after his outing when his teammate Brandon Sproat let him know in the dugout. When Miz went back and looked at the pitch that clocked in at 105.5, he noticed something that everyone else missed: he slipped. It's not easy to see in the video below, but after the game, Miz told reporters, "I think I slipped a little...If you watch the video, my front foot it kind of slides out from under me."

"So I think I got a little bit more," finished Miz, suggesting that if he hadn't slipped on the pitch in question, he could've posted an even higher velocity on the pitch. When asked if he thinks 106 mph is attainable, Miz responded, "Yeah, I definitely think it's possible...Science says that you can hit 108, something like that? I think there's going to be someone that eventually hits it. If that's me, cool, but I don't think that's something I need to focus on."

Misiorowski himself may not be focusing on it, but those who watch his starts can't help but notice his head-turning velocity. Brewers fans are especially aware of what it would take for Miz to officially throw the fastest pitch in MLB history. See, while Miz holds every record for fastest-thrown pitches by a starting pitcher, one legendary flame-throwing closer still holds the record for the "fastest pitch ever thrown."

Jacob Misiorowski's latest velocity record puts him in striking distance of Aroldis Chapman's record

While Misiorowski's 105.5 mph fastball is certainly the fastest ever thrown by a starting pitcher in the pitch-tracking era, 8x All-Star closer Aroldis Chapman still holds the record for the fastest pitch thrown by any pitcher. Back in 2010, during his rookie season, Chapman threw a pitch 105.8 mph and since then threw another fastball 105.7 mph. After that, it's Misiorowski in third place with the 105.5 mph fastball that he threw to Pete Crow-Armstrong last night.

Here's the difference between Miz and Chapman. The latter threw 25 pitches in the outing in which he reached 105.8 mph, while Miz threw 107 pitches last night. To make matters even more impressive, Misiorowski's 107th pitch last night clocked in at 102.8 mph and struck out Ian Happ with the bases loaded.

It's truly unbelievable just how much Misiorowski has grown in his sophomore season. Not only is he reaching new heights with his fastball, but the 24-year-old ace has easily been the most dominant arm in baseball this year. He leads qualified starters in ERA (1.45), WHIP (0.77), strikeouts (146), opponent batting average (.144), and more, all while setting record after record in the velocity column. With no one knowing exactly what he will do next, Miz's starts have certainly become must-watch television.

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