Jacob Misiorowski is rewriting what's physically possible on a mound

Jacob Misiorowski just posted a run that only three other pitchers have matched since anyone started tracking this stuff seriously, and he's doing it while throwing harder than anyone who's ever stood on a big league mound. ESPN reported he set the starting-pitcher velocity record at 104.5 mph back on June 12, then broke his own record with a 105.5 mph fastball against the Cubs — the third-fastest pitch ever tracked, trailing only two Aroldis Chapman relief appearances. That's not a reliever airing it out for one batter. That's a starter doing it deep into outings, all season long.

Then came July 26th, a start that didn't feel real in real time. Misiorowski opened by striking out the side, and it only escalated from there — 103, then 104 mph fastballs stacking up as the innings ticked by.

Rob Friedman

@PitchingNinja

Miz finishes off K'ing the Side with 104 mph 👀 13 Pitches over 103 mph in the 1st inning. 😳

The pitch-count math got absurd fast. Rob Friedman pointed out that Misiorowski threw 13 pitches over 103 mph in the first inning alone — more than Mason Miller, the hardest-throwing closer in the sport, had thrown all season combined at that point. By the time the day was over, Codify Baseball tallied 66 fastballs over 100 mph in one start, a new MLB single-game record, averaging 102.8 mph on the gun.

Rob Friedman

@PitchingNinja

Miz had 66 fastballs over 100 mph today... New MLB single game record.

That's not a hot inning or a strikeout binge — that's a full workload of triple-digit gas that no starter in the pitch-tracking era, which dates back to 2008, had ever come close to sustaining. Jeff Passan called it out directly, noting the average sat at 102.8 mph across all 66 heaters. Codify's follow-up chart of every single fastball reading from the game reads like a typo, string after string of 102s, 103s, 104s, topping out at 105.

Codify

@CodifyBaseball

Jacob Misiorowski's fastballs today (in MPH): 🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥 104 103 104 104 104 104 103 104 103 103 104 104 104 104 102 102 103 103 103 103 103 105 105 103 104 103 104 102 102 104 103 103 102 103 104 102 103 102 103 102 102 103 102 103 104 104 102 102 103 103 103 103 102 102 104 102 103 102 102 101 102 102 100 100 100 101 🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥

Zoom out from that one start and the season-long numbers are arguably even crazier. Codify tracked Misiorowski at 210-plus pitches this year with 105+ mph of perceived velocity — the rest of the league combined has thrown two, both from Mason Miller. And the strikeout-to-walk profile backs up that the heat isn't wild: Friedman noted 39 strikeouts against a single walk in July alone. That efficiency is exactly what put him in the company Codify flagged over the weekend — a sub-1.00 ERA with 130-plus strikeouts across any 14-game stretch, a list that before this year contained exactly three names: J.R. Richard, Pedro Martinez and Jacob deGrom.

For a 24-year-old who's barely a season and a half into a big league career, that's the kind of stat line that changes how a front office plans around a guy. He's not just the hardest thrower in the sport right now — he's doing it with command, deep into games, at a workload nobody else can touch. The strikeout props are going to keep printing until someone proves this is beatable.