One rookie pitcher couldn’t have asked for a better MLB debut — except for one thing.
Jacob Misiorowski was a thorn in the side of the Cardinals, as he was shutting down their batters the whole night with five hitless innings in Thursday night’s 6-0 Brewers win, but his night was cut short with an injury the team called right calf and quad cramping, according to MLB.com.
In the sixth inning, it appeared that he had rolled his ankle, and after talking with coaches and athletic trainers, he left the game.
Jacob Misiorowski throws a pitch during the Brewers’ 6-0 home win over the Cardinals on June 12, 2025. Getty ImagesStill, the young pitcher notched his first MLB win during his highly anticipated debut.
One major reason for the anticipation was how fast he pitched the ball, and fans who tuned into the game looking to watch the flamethrower throw heat were not disappointed.
His first pitch in the majors found the strike zone and clocked in at 100.5 mph — the second-fastest pitch by a Brewers starting pitcher since 2008.
But that pitch was soon usurped as his second pitch, which clocked in at 101.8 mph.
He didn’t lose his velocity during the entire game, and his 78th pitch was 101 mph.
Jacob Misiorowski (left) walks off the field with head athletic trainer Brad Epstein during the sixth inning of the Brewers’ win over the Cardinals. APAccording to ESPN, he was only the 10th pitcher since 1891 to throw at least five hitless innings in a big league debut.
“It certainly bodes well,” manager Pat Murphy told reporters. “He has high standards for himself. He earned it to get here. We didn’t move him that quickly. He’s got to stay healthy, take care of himself.
“He seems like a pitcher. You know, he’s got pitch-ability. He’s not just a guy out there, heaving it.”
