"From the very first pitch, a 166.6 km/h lightning bolt! It's insane!" Mizerakowski shatters World Series all-time speed record → First in 18 years since tracking began

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With a single pitch, he completely overturned 18 years of World Series tracking history. Milwaukee Brewers "monster fireballer" Jacob Mizerakowski (24) marked a new page in Major League Baseball history with his opening pitch on the World Series stage.

On the 24th (Korean time), Mizerakowski started Game 1 of the 2026 Major League Baseball World Series (WS, best-of-seven series) against the Tampa Bay Rays at American Family Field in Milwaukee, Wisconsin. In the top of the first inning, he threw a fastball clocked at 103.5 mph (approx. 166.6 km/h) right down the middle to leadoff hitter Yandy Diaz.

According to ESPN and other U.S. media outlets, while the stadium scoreboard displayed 103.4 mph, Statcast, Major League Baseball's official tracking system, officially confirmed the final measurement at 103.5 mph.

This is the fastest pitch in World Series history since Major League Baseball introduced its pitch trajectory and speed tracking system in 2008. The previous record was 103.2 mph (approx. 166.1 km/h), set by Aroldis Chapman (37, currently with the Boston Red Sox) against Coco Crisp in the ninth inning of Game 2 of the 2016 World Series while playing for the Chicago Cubs. Mizerakowski broke Chapman's record after a decade, and a staggering 18 years since pitch tracking began.

When limited to starting pitchers, the gap is beyond imagination. Until now, the fastest pitch by a World Series starter was 101.1 mph (approx. 162.7 km/h), thrown by Noah Syndergaard of the New York Mets against Ben Zobrist in the top of the first inning of Game 3 of the 2015 World Series. Mizerakowski threw a fastball 3.9 km/h faster than that from his very first pitch, showcasing command on an entirely different level.

The 24-year-old young right-hander, who made his Major League debut in June last year, bombarded the MLB mound this season. During the regular season, he threw a staggering 1,115 pitches at 100 mph (approx. 160.9 km/h) or faster, far surpassing the previous single-season record of 673 set by Jordan Hicks (then with St. Louis) in 2018. On June 27 against the Cubs, he recorded a personal best of 105.5 mph (approx. 169.8 km/h), coming within striking distance of the all-time regular season record of 105.8 mph set by Chapman in 2010.

The pressure of fall baseball could not stop his blazing fastball. Of the 182nd pitches he threw during this postseason's Division Series and Championship Series, a significant majority—96 pitches—exceeded 100 mph. In fact, on October 3 in Game 1 of the NLDS against the San Diego Padres, he threw a 104.8 mph (approx. 168.7 km/h) pitch at Fernando Tatis Jr., already breaking the all-time postseason speed record.

On this day, Mizerakowski allowed two hits in the top of the first inning and briefly loaded the bases, but he used his signature terrifying command to completely shut down subsequent batters, ending the inning without allowing a run. The 24-year-old rising star's fastball show, which shocked the global baseball world at the start of the World Series, is writing a new fall legend.

On this day, Mizerakowski recorded five innings pitched, four hits allowed, three strikeouts, one walk, and one run allowed before handing the mound to relief pitcher Abner Uribe (26).

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*This content was translated by AI.View Original