Jacob Misiorowski's historic Brewers debut marred by early exit due to leg cramps - WATCH

On Thursday night, Milwaukee Brewers’ young pitcher Jacob Misiorowski had an exciting major league debut against the St. Louis Cardinals at American Family Field. The 23-year-old threw five innings without allowing a hit, struck out five and walked four but left the game early because of leg cramps.

Even though he couldn’t finish, the Brewers won 6-0, and Misiorowski’s strong start got everyone talking.

A dazzling debut of Jacob Misiorowski cut short

Jacob Misiorowski stepped onto the field as the Brewers’ top young pitcher, and he amazed everyone in his first big-league game. He started strong, throwing three super-fast pitches over 100 mph, which got the Cardinals’ batters off guard. According to MLB news from June 12, 2025, he threw 14 pitches at 100 mph or faster, with one reaching 102.2 mph, the fastest by a Brewers starter since 2008.

He used fastballs, cutters, and even a 92 mph changeup to keep hitters confused. But after a long break in the fifth inning when the Brewers scored five runs, Misiorowski felt cramps in his right leg. While moving back to the mound, he seemed to twist his ankle, and the trainer came out to check on him.After talking with manager Pat Murphy and the medical team, he left the game, and the crowd cheered loudly for him. Misiorowski said later he felt okay and wasn’t too worried.

Also Read: Aaron Civale's trade request triggers sharp response from Brewers manager after bullpen role decision

A bright future for the young star

Even though he left early, Misiorowski’s debut has Brewers fans excited about his future with the team. His game was historic, as he’s only the third pitcher since 1900 to throw five innings without a hit in his first MLB game, joining names like Emmet Sheehan and Red Ames.Manager Pat Murphy said he loved how Misiorowski mixed his pitches, using his fast throws to control the game. Picked in the second round of the 2022 MLB Draft, Misiorowski was ranked the 87th-best prospect by The Athletic. His strong debut showed why the Brewers moved another pitcher, Aaron Civale to the bullpen to give him a spot in the starting lineup.Murphy compared him to Brewers stars like Brandon Woodruff and Corbin Burnes, saying he could be special. As Misiorowski keeps growing, the Brewers believe he’ll be a key part of their team for a long time.