Jacob Walter Misiorowski () born April 3, 2002) is an American professional

baseball Baseball is a bat-and-ball games, bat-and-ball sport played between two team sport, teams of nine players each, taking turns batting (baseball), batting and Fielding (baseball), fielding. The game occurs over the course of several Pitch ...

pitcher In baseball, the pitcher is the player who throws ("Pitch (baseball), pitches") the Baseball (ball), baseball from the pitcher's mound toward the catcher to begin each play, with the goal of out (baseball), retiring a batter (baseball), batter, ...

for the

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(MLB). He made his MLB debut in 2025.

Amateur career

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 In sports, a winning percentage or Copeland score is the fraction of games or matches a team or individual has won. The statistic is commonly used in standings or rankings to compare teams or individuals. It is defined as wins divided by the tot ...

with a 1.48

earned run average In baseball statistics, earned run average (ERA) is the average of earned runs allowed by a pitcher per nine innings pitched (i.e. the traditional length of a game). It is determined by dividing the number of earned runs allowed by the number ...

(ERA) and was named All-State. Misiorowski participated in a bullpen session that December, where he showcased a quality

curveball In baseball and softball, the curveball is a type of pitch thrown with a characteristic grip and hand movement that imparts forward spin to the ball, causing it to dive as it approaches the plate. Varieties of curveball include the 12–6 curve ...

with scouts from the

Tampa Bay Rays The Tampa Bay Rays are an American professional baseball team based in the Tampa Bay area. The Rays compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. They are one of two major ...

, and

Colorado Rockies The Colorado Rockies are an American professional baseball team based in Denver. The Rockies compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League West, West Division. Th ...

in attendance. Misiorowski's senior season in 2020 was canceled due to

COVID-19 Coronavirus disease 2019 (COVID-19) is a contagious disease caused by the coronavirus SARS-CoV-2. In January 2020, the disease spread worldwide, resulting in the COVID-19 pandemic. The symptoms of COVID‑19 can vary but often include fever ...

. His chances of being drafted that year were significantly lowered by MLB's decision to shorten the 2020 draft to five rounds, and Misiorowski's determination to play

college baseball College baseball is baseball that is played by Student athlete, student-athletes at institutions of higher education. In the United States, college baseball is sanctioned mainly by the National Collegiate Athletic Association (NCAA); in Japan, ...

after missing that senior year. He initially committed to

Oklahoma State Oklahoma State University (informally Oklahoma State or OSU) is a public land-grant research university in Stillwater, Oklahoma, United States. The university was established in 1890 under the legislation of the Morrill Act. Originally known ...

but later decided to enroll at Crowder College. Misiorowski appeared in two games as a freshman at Crowder in 2021 before

redshirt Redshirt, Red Shirt, or Redshirts may refer to: Sports * Redshirt (college sports) Redshirt, in United States college athletics, is a delay or suspension of an athlete's participation in order to lengthen their period of eligibility. Typically ...

ing the season after a knee injury. He committed to transfer to Louisiana State for his final three years of collegiate eligibility during the season. Misiorowski made 15 starts at Crowder during his redshirt season in 2022 and was named a second team

NJCAA The National Junior College Athletic Association (NJCAA) is the governing association of community college, State college (disambiguation), state college, and junior college athletics throughout the United States. Currently the NJCAA holds 24 sepa ...

All-American after going 10–0 with a 2.72 ERA and registering 136 strikeouts in 76 innings pitched. Following the end of the 2022 season, Misiorowski participated in the

Combine and recorded the eight fastest pitches and averaged 99.8 miles per hour on his

fastball The fastball is the most common type of pitch (baseball), pitch thrown by pitchers in baseball and softball. Its distinctive feature is its high speed. "Power pitchers," such as former major leaguers Nolan Ryan and Roger Clemens, relied on the ...

. These superlative numbers brought widespread attention to Misiorowski and the expectation that he would be selected early in the 2022 MLB draft.

Professional career

Although Misiorowski committed to play college baseball at

Louisiana State University Louisiana State University and Agricultural and Mechanical College, commonly referred to as Louisiana State University (LSU), is an American Public university, public Land-grant university, land-grant research university in Baton Rouge, Louis ...

, the

selected Misiorowski 63rd overall in the

2022 Major League Baseball draft The 2022 Major League Baseball draft took place on July 17–19, 2022, in Los Angeles. The draft assigned amateur baseball players to Major League Baseball (MLB) teams. The draft order was based on the reverse order of the 2021 MLB season standin ...

. 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. In August 2024, the Brewers promoted Misiorowski to their AAA minor league affiliate and moved him to the

bullpen In baseball, the bullpen (or simply the pen) is the area where relief pitchers warm up before entering a game. A team's roster of relief pitchers is also metonymically referred to as "the bullpen". These pitchers usually wait in the bullpen if ...

for a potential major league role later in their season. Their stated long-term plan, however, was for him to remain as a

starting pitcher In baseball (hardball or softball), a starting pitcher or starter is the first pitcher in the game for each team. A pitcher is credited with a game started if they throw the first pitch to the opponent's first batter of a game. Starting pit ...

. To begin the 2025 season, ''

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'' rated Misiorowski as the Brewers' third-best prospect. The team assigned him to the Triple-A

Nashville Sounds The Nashville Sounds are a Minor League Baseball team of the International League and the Triple-A (baseball), Triple-A affiliate of the Milwaukee Brewers. They are located in Nashville, Tennessee, Nashville, Tennessee, and are named for the ci ...

, where he posted a 2.13 ERA with 80 strikeouts in 13 appearances. By June, ''

'' had Misiorowski as the 21st-best prospect in all of baseball. On June 12, he was promoted to the major leagues. 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 Statcast is an automated tool developed to analyze player movements and athletic abilities in Major League Baseball (MLB). Statcast was introduced to all thirty MLB stadiums in 2015. The Statcast brand is also licensed to ESPN, which uses it to ...

era, topping out at . In his second start, against the

Minnesota Twins The Minnesota Twins are an American professional baseball team based in Minneapolis. The Twins compete in Major League Baseball (MLB) as a member club of the American League (AL) American League Central, Central Division. The team is named afte ...

, 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 Paul David Skenes (, born May 29, 2002) is an American professional baseball pitcher for the Pittsburgh Pirates of Major League Baseball (MLB). He made his MLB debut in 2024. Skenes played college baseball for the Air Force Falcons baseball, Air ...

and the

Pittsburgh Pirates The Pittsburgh Pirates are an American professional baseball team based in Pittsburgh. The Pirates compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central ...

, 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 Clayton Edward Kershaw (born March 19, 1988) is an American professional baseball pitcher for the Los Angeles Dodgers of Major League Baseball (MLB). A left-handed starting pitcher, Kershaw has spent his entire MLB career with the Dodgers s ...

and the

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—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 The Immaculate Conception is the doctrine that the Virgin Mary was free of original sin from the moment of her conception. It is one of the four Marian dogmas of the Catholic Church. Debated by medieval theologians, it was not defined as a ...

, 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.https://www.espn.com/mlb/story/_/id/45730740/phillies-rip-mlb-adding-jacob-misiorowski-all-star-roster

References

External links

Crowder Roughriders bio"MLB Office Hours" interview
{{DEFAULTSORT:Misiorowski, Jacob 2002 births Living people 21st-century American sportsmen Baseball players from Missouri Biloxi Shuckers players Carolina Mudcats players Crowder Roughriders baseball players Major League Baseball pitchers Milwaukee Brewers players Nashville Sounds players National League All-Stars Sportspeople from Blue Springs, Missouri Wisconsin Timber Rattlers players