Historic Velocity Pitcher
Jacob Misiorowski Throws MLB Record 105.5 MPH Fastball as Starting Pitcher
Key Points
In six innings against the Cubs, Misiorowski allowed two hits (including a fifth‑inning Seiya Suzuki homer), walked four, and struck out eight.
Sportalkorea notes he is the No. 1 starting pitcher with more than 50 innings this season, averaging 100.2 mph on his fastball—about 1.7 mph faster than the next-closest starter.
Nolan Ryan, the Hall of Famer, told The Athletic that Misiorowski has the best arm he has seen in baseball in a long time.
The outing came amid a stretch in which Misiorowski has logged seven 104+ mph pitches across his last three starts.
Analysts highlight his velocity dominance, noting he has thrown 49 of the 51 fastest pitches ever recorded by a starter in MLB history.
Milwaukee Brewers starter Jacob Misiorowski threw a 105.5 mph fastball against the Chicago Cubs on June 26, the fastest pitch ever recorded by a starting pitcher in MLB history, according to Heavy Sports. The 24-year-old right-hander did it in the first inning, on just his third pitch of the game — and still hit 102.8 mph on his 107th and final pitch of the night.
Misiorowski finished with eight strikeouts and one run allowed in six innings, picking up his eighth win in nine decisions and leading Milwaukee to a 6-2 victory, TSN reported. His 105.5 mph mark ties him for third-fastest in MLB history overall, trailing only Aroldis Chapman's 105.8 and 105.7 mph outputs.
A Season-Long Sprint Through the Record Books
Misiorowski's record didn't come out of nowhere. He has been systematically dismantling the starter velocity chart all season. He broke the previous starting pitcher record — Jordan Hicks's 103.2 mph from 2022 — back in early May. Then he hit 104.5 mph against the Philadelphia Phillies on June 12, in a 15-strikeout complete-game shutout. Three weeks later, he broke that record too, according to Fox Sports.
The numbers tell a staggering story. Misiorowski has thrown 49 of the 51 fastest pitches ever recorded by a starting pitcher in MLB history. He has logged seven pitches above 104 mph across just his last three starts. His average fastball this season sits at 100.2 mph — roughly 1.7 mph faster than the next-closest starter in baseball.
'I Think I Slipped' — The Accidental Record Pitch
Misiorowski didn't even know he threw a record pitch right away. Teammate Brandon Sproat told him about it in the dugout after the inning. And when asked about the pitch itself, Misiorowski admitted it wasn't a perfect delivery. "I think I slipped a little... my front foot kind of slides out," he said after the game, per Reviewing the Brew.
The pitch was thrown to Cubs leadoff hitter Pete Crow-Armstrong. Despite 105.5 mph of heat, Crow-Armstrong fouled it off before eventually striking out. Brewers catcher William Contreras wasn't surprised by any of it. "This is not a normal pitcher," Contreras said. "I think he can go out there and throw 100 fastballs and get through a game," according to MLB.com.
Nolan Ryan Says He Has Never Seen an Arm Like This
The praise for Misiorowski is coming from the highest levels of the sport. Hall of Fame pitcher Nolan Ryan — who spent decades as the gold standard for velocity — told The Athletic that Misiorowski has "the best arm he has seen in baseball in a long time." Ryan held the MLB strikeout record for decades and knows elite arms better than almost anyone.
Brewers outfielder Garrett Mitchell summed up what it's like to watch Misiorowski work. "It feels like every time he goes out there, he's breaking a record," Mitchell said, per Reviewing the Brew. The numbers back that up. Misiorowski leads MLB with a 1.45 ERA and 146 strikeouts. Batters whiff on 49.7% of swings against his 100-plus mph fastballs, according to FanGraphs.
The Big Question: Can a Starter Sustain 105 MPH Long-Term?
The historic velocity has also sparked serious debate. Relievers like Chapman and Ben Joyce could throw 105 mph because they only faced 15 to 20 batters per outing. Misiorowski is doing it across 100-plus pitches as a starter. Some analysts worry the Brewers are "playing with fire" by letting him throw that hard, that deep into games, according to NBC Sports.
Supporters point to his 6-foot-7 frame and elite extension — he releases the ball more than seven feet down the mound — as natural protection for his arm. His lower-body strength work over the offseason has also helped clean up his mechanics. If he stays healthy, analysts expect him to command one of the largest pitching contracts in MLB history once he hits free agency, given his status as a true one-of-a-kind arm.
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