Milwaukee Brewers pitcher Jacob Misiorowski set a World Series record for velocity on Friday, Oct. 23, 2026, during the opening game against the Tampa Bay Rays. The 24-year-old right-hander delivered his first pitch of the game, a fastball to Yandy Díaz, at 103.5 mph.
The previous record for the fastest pitch in a World Series was 103.2 mph, set by Chicago Cubs reliever Aroldis Chapman in 2016. Among starting pitchers, the previous record since tracking began in 2008 was 101.1 mph, set by the New York Mets’ Noah Syndergaard in 2015. Misiorowski reached at least 100 mph on 38 of his 78 pitches during Friday's game, surpassing the previous World Series high of 24 set by Chapman.
Misiorowski earned the win as the starting pitcher, allowing one run and four hits over five innings. He recorded three strikeouts and one walk. The Brewers won the game 3-2, marking the team’s first World Series appearance in 44 years. Misiorowski had previously reached 105.5 mph during a regular-season game against the Chicago Cubs on June 27.
During the 2026 postseason, he has reached 100 mph on 134 out of 260 total pitches. The Brewers noted that while his velocity remained high, his spin rate was lower than earlier in the year, which followed an increase in his workload from 141 1/3 innings last season to 188 innings this year.
MLB's Statcast system tracked three separate pitches from Misiorowski at 103 mph or higher during the game. The World Series continues following this opening game, with future matchups determining the champion of the 2026 season. Misiorowski’s next scheduled appearance was not reported.