Brewers' Jacob Misiorowski broke the record for fastest World Series pitch with the very first offering of this year's Fall Classic, a 103.5 mph fastball to Tampa Bay Rays' Yandy Diaz. Aroldis Chapman set the previous Series pitcher mark at 103.2 mph in 2016. The 24-year-old right-hander's heat has captivated the sport since his debut in June 2025.
Misiorowski easily outdistanced the previous high by a starting pitcher since tracking started in 2008. Brewers' Misiorowski threw 1,115 pitches 100 mph or higher this year, shattering the old high of 673 by Jordan Hicks of St. Louis in 2018. His fastest pitch was 105.5 mph to Chicago Cubs' Pete Crow-Armstrong on June 27, just shy of the regular-season record of 105.8 mph by Chapman for Cincinnati against San Diego on Sept. 24, 2010.
Source: ESPN MLB · Summarized by HeadlinesBriefing