Jacob Misiorowski doesn't really do warm-ups. The Brewers right-hander opened his outing with a fastball that touched 104 mph, and it turned out that wasn't even the peak, just the appetizer.
The very first pitch of the game came in at 104 mph.
From there it was just a parade of triple digits. Misiorowski ran it back up to 103 mph twice more before blowing away the side to end the first inning, still sitting at 104 mph with swings and misses to show for it.
Misiorowski closed out the first inning by striking out the side, topping out again at 104 mph.
The number that actually stopped people cold wasn't the topline velocity, it was the volume. Misiorowski threw 13 pitches over 103 mph in that single first inning alone. For context, Mason Miller, the hardest-throwing closer in the sport, has thrown 11 pitches over 103 mph across his entire season. A starter matched, then beat, a max-effort reliever's whole-year total before he'd even faced the order twice.
The side-by-side comparison to Mason Miller's season-long triple-digit count is what turned this into a viral moment.
Jacob Misiorowski had 13 Pitches over 103 mph in the 1st inning. Mason Miller (hardest throwing closer in MLB) has 11 pitches over 103 this entire season.
This isn't a one-start fluke. Misiorowski broke his own single-pitch velocity record with a 105.5 mph fastball back on June 26, and he's been climbing all year, averaging a league-leading 100.5 mph on his heater. Add in an ERA sitting at 1.62, a WHIP under 0.80, and a strikeout rate that's crept from the mid-30s in April to nearly 46% heading into the break, and you get a rookie-eligible arm who just made his second All-Star team and is squarely in the NL Cy Young conversation.
None of it comes free. The Brewers scratched him from a start earlier this month with arm fatigue and have been openly managing his workload since, which makes stretches like this one both thrilling and a little nerve-wracking for Milwaukee's medical staff. It also explains why this outing matters beyond the highlight reel: for prop bettors and fantasy managers leaning into Misiorowski's strikeout numbers down the stretch, a curveball at 91 mph on top of triple-digit gas is basically an unfair second weapon.
As if the fastball wasn't enough, Misiorowski also dropped a 91 mph curveball into the mix.
The scary part for the rest of the National League is that Misiorowski is still building. If the velocity keeps climbing the way it has all season, outings like this stop being outliers and start being the baseline, and Milwaukee's workload management becomes the only thing standing between him and a full-blown ace breakout.