Brewers’ Jacob Misiorowski tops himself with 104.5 mph fastball, fastest by a starter since tracking began

MILWAUKEE, June 13, 2026. Jacob Misiorowski didn’t just bring velocity to American Family Field, he pushed it to a new benchmark. In the Brewers’ 6-0 win over the Phillies, the right-hander struck out Kyle Schwarber with a 104.5 mph fastball, the fastest pitch recorded from a starter since MLB began pitch tracking in 2008, according to MLB’s game report.

The moment mattered because Schwarber is a high-impact hitter, the kind of bat that can change innings on contact even when a team gets ahead early. Misiorowski’s ability to reach that speed in a strikeout sequence underscored how difficult it can be to square up elite pace, especially when it comes from a starter who is expected to set the tone rather than save it for later innings.

Misiorowski’s outing also came with game-level leverage. Milwaukee built and maintained separation in front of its home crowd, turning the hard-throwing display into a comfortable run total. The 6-0 score gives a sense of how effectively the Brewers converted early innings into control, forcing Philadelphia to spend at-bats chasing a deficit instead of trying to answer it with one swing.

Beyond the headline number, the 104.5 mph mark lands in a larger historical frame. Pitch tracking has made velocity comparisons far more precise than they were in the pre-tracking era, and MLB’s identification of the pitch as the hardest by a starter since 2008 places the performance in a league-wide record category rather than a team-specific milestone.

For Misiorowski, a pitch like that changes how hitters and coaches will prepare for him. Even without adding new technical details from the report, a starter who can routinely reach triple digits at the top end tends to draw more attention at the margins, increasing the value of sequencing and location as much as raw speed. The next step is whether Milwaukee can keep getting that same effectiveness while managing workload, because the modern game asks pitchers to balance maximum velocity with repeatability.

For the Brewers, outings like this tighten internal conversations about rotation roles and development priorities. When a starter produces both a record velocity moment and a decisive result, it adds certainty to how the club can plan around innings and leverage matchups, even if the organization still measures consistency over a season rather than one start.

What to watch next is straightforward: whether Milwaukee can turn these velocity peaks into sustained run prevention against future opponents, and whether Misiorowski’s team-managed pitch usage allows him to repeat similar effectiveness without fading as the outing goes on. If the fastball remains that dangerous, it also raises the baseline for how quickly Philadelphia and future opponents will have to adjust their approach.

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