Key facts
- Jacob Misiorowski of the Milwaukee Brewers has a fastball that averages 99.9 mph.
- His fastball has topped out at 103.6 mph.
Jacob Misiorowski, a pitcher for the Milwaukee Brewers, is noted for his exceptional fastball velocity. His pitches average 99.9 mph, and he has recorded a top speed of 103.6 mph. This level of velocity suggests he may be one of the hardest throwers in baseball history.