Misiorowski Sets World Series Record With 103.5 mph First Pitch Jacob Misiorowski of the Milwaukee Brewers threw a 103.5 mph fastball to Yandy Diaz of the Tampa Bay Rays on the first pitch of Game 1, setting the record for the fastest World Series pitch. Jacob Misiorowski of the Milwaukee Brewers made World Series history with the first pitch of Game 1 against the Tampa Bay Rays on Friday night. Misiorowski Sets World Series Fastest Pitch RecordThe 24-year-old right-hander threw a 103.5 mph fastball to Yandy Diaz. The pitch set the record for the fastest World Series pitch ever recorded. The first pitch was listed at 103.4 mph on the stadium video boards. MLB's Statcast system clocked it at 103.5 mph.The pitch was taken for a ball above the strike zone. This eclipsed the previous World Series record of 103.2 mph. Aroldis Chapman of the Chicago Cubs previously held the mark. He threw a 103.2 mph pitch in the ninth inning of Game 2 in 2016.That offering resulted in a groundout to second by Cleveland's Coco Crisp. Misiorowski easily outdistanced the previous high by a starting pitcher in the World Series since pitch tracking began in 2008. Noah Syndergaard of the New York Mets held that mark. He threw a 101.1 mph pitch to Kansas City's Ben Zobrist in the first inning of Game 3 in 2015.That pitch was taken for a ball. Misiorowski's first 10 pitches to the Rays were all fastballs, including two that were hit for singles. He threw fastballs on 11 of 13 pitches in a scoreless first inning. He reached 100 mph with 10 of them and averaged 101.9 mph.Brewers Rookie Dominates With High Velocity HeatHe allowed two hits in the first inning but stranded both runners. Misiorowski has captivated the sport with his heat since debuting in June 2025. He threw 1,115 pitches at 100 mph or higher this year, shattering the old high of 673 set by Jordan Hicks of St. Louis in 2018. His fastest pitch of the season was 105.5 mph to Pete Crow-Armstrong of the Chicago Cubs on June 27.That 105.5 mph offering fell just shy of the regular-season record of 105.8 mph, set by Chapman for Cincinnati against San Diego on Sept. 24, 2010. In the postseason before the World Series, Misiorowski reached 100 mph with 96 of 182 pitches in the Division Series and League Championship Series. His high was 104.8 mph, taken for a strike by Fernando Tatis Jr. of San Diego on the first pitch of the NLDS opener on Oct. 3.Record Outshines Previous Postseason And Regular Season MarksThat 104.8 mph pitch set a mark for the fastest postseason pitch. It topped the 104.5 mph thrown by San Diego reliever Mason Miller on a called third strike to Carson Kelly of the Cubs in the eighth inning of a Wild Card Series Game 2 last year. Misiorowski's record-setting first pitch came in Game 1 of the World Series at Milwaukee on Oct. 23, 2026. The historic moment came on the very first offering of this year's Fall Classic.The sellout crowd at American Family Field witnessed the record-breaking pitch as the Brewers opened the series against the Rays.