Jacob Misiorowski

Jacob Walter Misiorowski ( ; born April 3, 2002), nicknamed "the Miz", is an American professional baseball pitcher for the Milwaukee Brewers of Major League Baseball (MLB). He made his MLB debut in 2025 and his first MLB All-Star appearance the same year. In 2026, he set the record for the fastest pitch thrown by a starting pitcher since tracking began in 2008. He has also thrown 934 pitches that have hit or exceeded 100+ mph in 2026.

Early life Jacob Walter Misiorowski was born on April 3, 2002, in Blue Springs, Missouri. Misiorowski grew up in Grain Valley, Missouri, and attended Grain Valley High School. As a junior in 2019, he posted a 9–2 win-loss record with a 1.48 earned run average (ERA) and was named All-State. Misiorowski participated in a bullpen session that December, where he showcased a quality curveball with scouts from the Milwaukee Brewers, Tampa Bay Rays, and Colorado Rockies in attendance.

Misiorowski's senior season in 2020 was canceled due to COVID-19. His chances of being drafted that year were significantly lowered by MLB's decision to shorten the 2020 draft to five rounds,

Misiorowski appeared in two games as a freshman at Crowder in 2021 before a torn meniscus ended his season. Following the end of the 2022 season, Misiorowski participated in the Major League Baseball Combine and recorded the eight fastest pitches and averaged 99.8 miles per hour on his fastball. These superlative numbers brought widespread attention to Misiorowski and the expectation that he would be selected early in the 2022 MLB draft. the Milwaukee Brewers selected Misiorowski 63rd overall in the 2022 Major League Baseball draft. He signed with the Brewers on July 27, 2022, for an over-slot signing bonus of $2.35 million; the slot value for the 63rd pick that year was $1.1 million.

To begin the 2025 season, Baseball America rated Misiorowski as the Brewers' third-best prospect. The team assigned him to Triple-A Nashville, where he posted a 2.13 ERA with 80 strikeouts in 13 appearances. By June, Baseball America had Misiorowski as the 21st-best prospect in all of baseball. In his MLB debut, Misiorowski earned a win after throwing five innings of no-hit baseball. His start featured the fastest pitch thrown by a Brewers pitcher in the Statcast era, topping out at . In his second start, against the Minnesota Twins, Misiorowski threw six perfect innings, becoming the first MLB player to record 11 no-hit innings to start his career since 1961. In his third start, against Paul Skenes and the Pittsburgh Pirates, he became the first MLB pitcher since 1901 to allow five hits or fewer across his first three career starts. Misiorowski's fifth start came against Clayton Kershaw and the Los Angeles Dodgers—the National League leader in wins at the time, bolstered by what Milwaukee's local newspaper said was the best lineup in baseball that year. Misiorowski struck out twelve batters in six frames, including a near-immaculate inning, and induced a league-leading twenty-one swings-and-misses.

On July 11, 2025, Misiorowski was named to the National League All-Star roster as a replacement for Matthew Boyd, making him the fastest player in league history to become an All-Star after just five major league games. His selection was controversial due to his lack of experience in the majors. Misiorowski struggled after his All-Star Game appearance, getting scored on in each of his last nine appearances, where he went 1–2 with a 5.89 ERA. Misiorowski finished the regular season with a 5–3 record, a 4.36 ERA, and 87 strikeouts in 66 innings pitched. He also gained some Rookie of the Year votes, finishing 11th in National League Rookie of the Year voting.

Misiorowski was kept on the Brewers' postseason roster and made his postseason debut in game 2 of the National League Division Series against the Chicago Cubs. Misiorowski would pitch three shutout innings, with four strikeouts and would get credit for the win in a 7–3 Brewers win. Misiorowski would also pitch in relief in the series-deciding Game 5, pitching four innings and surrendering only one run, along with three strikeouts in a 3–1 Brewers win, which Misiorowski would also get credit for. Misiorowski would finish the NLDS with a 2–0 record and a 1.29 ERA, along with seven strikeouts in seven innings pitched. Misiorowski would appear in Game 3 of the National League Championship Series against the Dodgers, pitching five innings and surrendering one earned run, while striking out nine batters, but would get hit with the loss. Misiorowski would finish the postseason with a 2–1 record and a 1.50 ERA, striking out 16 batters in 12 innings pitched.

On March 20, 2026, the Brewers announced that Misiorowski would be the starting pitcher on Opening Day, on March 26, against the Chicago White Sox. Misiorowski would become the youngest Brewers pitcher to start on Opening Day since Ben Sheets in 2002, and the third youngest in franchise history. Misiorowski would give up a lead-off home run to Chase Meidroth to start the game, but would shut the White Sox down for the remainder of his start, giving up only two hits and three walks while striking out 11 batters in five innings, the most ever by a Brewers pitcher on Opening Day, while getting the decision in a 14–2 Brewers win.

On May 1, 2026, Misiorowski threw hitless innings against the Washington Nationals before having to leave the game due to a right hamstring cramp. Misiorowski struck out 8 batters and walked two and got the win decision in a 6–1 Brewers victory. During May of 2026, Misiorowski had a scoreless innings streak of consecutive scoreless innings pitched that ended on May 25, Memorial Day, against the St. Louis Cardinals, giving up a run on an RBI groundout in the sixth inning; his streak was the third-longest in Brewers history. Misiorowski pitched seven innings against the Cardinals, giving up only the single run, while striking out 12 batters, tying a career-high, and became the first MLB pitcher to reach 100 strikeouts for the season. He completed the month of May with an astounding 0.23 earned run average.

On June 6, 2026, Misiorowski threw a 103.7 mph fastball to Kyle Karros in a game against the Colorado Rockies, setting a new record for the fastest pitch delivered by a starting pitcher since tracking began in 2008.

On July 4, he was named to the All-Star Game for the second time in his career. During an August 9 start, Misiorwski notched his 200th strikeout of the season in his 130th inning pitched, becoming the second-fastest pitcher ever to reach the milestone, behind only Spencer Strider of the Atlanta Braves who reached the mark in his 124th inning in 2023.

Personal life Misiorowski is of Polish descent and has expressed interest in representing Poland in the World Baseball Classic. He grew up a fan of the Kansas City Royals.

Misiorowski is an avid Pokémon fan and card collector.

He became engaged to marry his now-fiancée, Elle, in 2026.