Jacob Misiorowski Bio
Jacob Walter Misiorowski, born on April 3, 2002, is an American professional baseball pitcher who plays for the Milwaukee Brewers of Major League Baseball (MLB). Nicknamed “the Miz,” Misiorowski first gained national attention with a record-setting debut in 2025, becoming one of the most talked-about young arms in the game. He was selected by the Brewers in the 2022 MLB draft after a standout amateur career that blended raw velocity with growing polish on the mound.
Early Life and Background
Jacob Misiorowski was born on April 3, 2002, and grew up in Grain Valley, Missouri. He attended Grain Valley High School, where he emerged as one of the top prep pitchers in the region. As a junior in 2019, he posted a 9–2 win-loss record with a 1.48 earned run average and was named All-State, drawing attention from professional scouts.
His senior season in 2020 was canceled due to the COVID-19 pandemic, a development that affected both his draft stock and his college plans. Originally committed to Oklahoma State, Misiorowski later chose to enroll at Crowder College, a junior college program known for developing pitchers. He redshirted in 2021 after a knee injury, but returned to the mound in 2022 and was named a second-team NJCAA All-American, going 10–0 with a 2.72 ERA and 136 strikeouts in 76 innings.
Path to Professional Baseball
During the 2022 season, Misiorowski committed to transfer to Louisiana State University for his final three years of collegiate eligibility. Following the end of that year, he participated in the Major League Baseball Combine, where he recorded the eight fastest pitches and averaged 99.8 miles per hour on his fastball. Those figures cemented his status as a first-round talent heading into the 2022 MLB draft.
Despite his college commitment, the Milwaukee Brewers selected Misiorowski 63rd overall in the 2022 draft. He signed with the club on July 27, 2022, for an over-slot bonus of $2.35 million, well above the slot value of $1.1 million for that pick. The signing launched his professional career and gave the Brewers a high-upside arm to develop.
Jacob Misiorowski Career
Early Career (2022–2024)
After signing with Milwaukee, Misiorowski began working his way through the Brewers’ minor-league system. He developed as a starting pitcher while also refining his secondary pitches, showing the kind of velocity and strikeout ability that had marked his amateur career. By August 2024, the Brewers had promoted him to the Triple-A Nashville Sounds and briefly moved him to the bullpen, though the team’s stated long-term plan remained to keep him in a starting role.
MLB Breakthrough (2025)
To begin the 2025 season, Baseball America rated Misiorowski as the Brewers’ third-best prospect. He opened the year at Triple-A Nashville, where he posted a 2.13 ERA with 80 strikeouts in 13 appearances. By June, Baseball America had him ranked as the 21st-best prospect in all of baseball. On June 12, 2025, the Brewers promoted him to the major leagues.
Misiorowski’s debut became one of the stories of the season. He earned a win after throwing five innings of no-hit baseball, registering the fastest pitch by a Brewers pitcher in the Statcast era at 102.3 miles per hour. In his second start against the Minnesota Twins, he threw six perfect innings, becoming the first MLB player since 1961 to record 11 no-hit innings to start a career. 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. His fifth start came against Clayton Kershaw and the Los Angeles Dodgers, where he struck out twelve batters in six innings and induced a league-leading 21 swings-and-misses.
On July 11, 2025, Misiorowski was named to the National League All-Star roster as a replacement for Matthew Boyd, becoming the fastest player in league history to become an All-Star after just five major league games. The selection drew debate given his limited major-league experience.
Milwaukee Brewers Era (2025–Present)
After the All-Star break, Misiorowski struggled, getting scored on in each of his last nine appearances and going 1–2 with a 5.89 ERA in that stretch. He finished the regular season with a 5–3 record, a 4.36 ERA, and 87 strikeouts in 66 innings pitched, also finishing 11th in National League Rookie of the Year voting.
The Brewers kept Misiorowski on their postseason roster, where he delivered key innings out of the bullpen. In Game 2 of the National League Division Series against the Chicago Cubs, he pitched three shutout innings with four strikeouts to earn a win in a 7–3 victory. In the deciding Game 5, he worked four innings and surrendered only one run with three strikeouts, earning another win in a 3–1 result. He appeared in Game 3 of the National League Championship Series against the Los Angeles Dodgers, pitching five innings with one earned run and nine strikeouts, but took the loss. He finished the postseason 2–1 with a 1.50 ERA and 16 strikeouts in 12 innings.
Driving Style and Strengths
Misiorowski’s game is built around elite velocity, with a fastball that regularly reaches triple digits and topped out at 102.3 miles per hour in the Statcast era. His curveball has been a quality second pitch since his amateur days, and his swing-and-miss rate has been a defining feature of his early MLB outings.
Notable Events and Milestones
Among his most notable milestones, Misiorowski became the fastest player in MLB history to become an All-Star after just five major league games in 2025. He also joined rare company as the first pitcher since 1961 to open a career with 11 consecutive no-hit innings and the first since 1901 to allow five hits or fewer across his first three starts.
Jacob Misiorowski Career Wins
In his first major-league season, Jacob Misiorowski established himself as a strikeout pitcher capable of shutting down opposing lineups. His debut victory, followed by postseason wins against the Cubs, highlighted his value to the Brewers in high-leverage moments.
MLB Highlights
Misiorowski made his first MLB win on debut in June 2025, throwing five no-hit innings. His postseason wins came in Games 2 and 5 of the National League Division Series against the Chicago Cubs, both pivotal victories for Milwaukee’s run to the NLCS.
Other Wins and Performances
During his redshirt sophomore year at Crowder College in 2022, Misiorowski went 10–0 with a 2.72 ERA, earning second-team NJCAA All-American honors and setting up his selection in the 2022 MLB draft.
Jacob Misiorowski Family
Family Background and Baseball Lineage
Misiorowski grew up in Grain Valley, Missouri, and developed his pitching career at Grain Valley High School. Public information about his parents and broader family is limited, with no verified details available.
Personal Life
Misiorowski is known by the nickname “the Miz.” There is no public information available about a spouse, partner, or children at this stage of his career.
2025 Season Performance
Misiorowski’s 2025 season was a storybook debut interrupted by late-season struggles. After his historic opening stretch, he was named an All-Star replacement and finished the regular season 5–3 with a 4.36 ERA and 87 strikeouts in 66 innings, also placing 11th in NL Rookie of the Year voting.
In the postseason, Misiorowski proved his value out of the bullpen, going 2–1 with a 1.50 ERA and 16 strikeouts in 12 innings across the NLDS and NLCS. His work against the Cubs helped Milwaukee clinch the division series, while his appearance against the Dodgers showed his ability to compete against one of the National League’s deepest lineups.
Looking ahead, Misiorowski remains one of the most closely watched young pitchers in baseball, with the Brewers expected to continue developing him as a foundational piece of their rotation.