Jacob Misiorowski Sets MLB Record with 103.7 mph Fastball

On June 7, 2026, Milwaukee Brewers right-hander Jacob Misiorowski threw a 103.7 mph fastball to Colorado Rockies third baseman Kyle Karros in the third inning of a 7-1 win. The radar reading is the fastest pitch recorded by a starter since MLB’s pitch-tracking began in 2008.

ESPNBleacher ReportJacob Misiorowski Sets MLB Record Hitting 103.7 MPH, Brewers Win

MLB introduced full pitch-tracking in 2008, standardizing velocity measurements for every pitch and enabling a clear distinction between starter and reliever records. Misiorowski’s prior high of 103.4 mph on May 25 against St. Louis was the previous starter record. The overall fastest pitch, 105.8 mph, was logged by reliever Aroldis Chapman in 2010.

ESPNJacob Misiorowski Sets MLB Record Hitting 103.7 MPH, Brewers WinBleacher Report

• Fastest starter pitch: 103.7 mph.

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• 52 of 98 total pitches reached 100 mph; 45 were 101 mph or higher.

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• Seven innings, eight strikeouts, one unearned run; ERA 1.50.

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• Career strikeouts 203 in 28 games, tying for seventh-fastest to 200 K’s.

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Brewers manager Pat Murphy praised the velocity but warned that success depends on locating pitches, noting “good hitters can time up anything.” Misiorowski described the outing as “it is what it is” and said he will keep pursuing strikeouts regardless of speed. Murphy also made a tongue-in-cheek reference to the WWE rivalry between Danhausen and The Miz when commenting on the pitch’s extension.

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Murphy cautioned that “the harder the better” mindset must be balanced with precision, emphasizing that pitches must be in the zone to be effective. Command, not just velocity, determines outcomes.

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The record highlights Misiorowski’s emergence as a premier power pitcher, strengthening the Brewers’ rotation and their pursuit of the NL Central title. It also adds a new benchmark for starter velocity in MLB analytics. Scouts may reassess velocity thresholds for starters.

Jacob Misiorowski Sets MLB Record Hitting 103.7 MPH, Brewers Win

The Brewers will seek to extend their division lead in the upcoming series against the Chicago Cubs, with Misiorowski slated to start the next game. The club will monitor his command and consistency as they aim to sustain the lead.

Jacob Misiorowski Sets MLB Record Hitting 103.7 MPH, Brewers Win

All sources agree on the 103.7 mph reading, but it applies only to starters; the overall fastest pitch is Chapman’s 105.8 mph. Independent verification beyond the stadium radar gun is not provided.

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• “Miz has got great extension and great velocity, so that doesn't surprise me,” — Pat Murphy, Brewers manager

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• “But we've got to get off that — the harder the better, and all that.” — Pat Murphy, Brewers manager

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• “But we've got to get off that — the harder the better, and all that. He's got to throw the ball in the zone and throw his other pitches in the zone. As I say often, good hitters can time up anything.” — Pat Murphy, Brewers manager

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• “I'm going to keep going, trying to get strikeouts, and if that's what it takes to get strikeouts, then so be it.” — Jacob Misiorowski, Brewers pitcher

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