The Postseason Speedometer: Misiorowski's 106 MPH Moonshot and the Props That Track It

The 2026 MLB postseason begins today with Wild Card Series across both leagues, and the Brewers' Jacob Misiorowski enters October as baseball's most raw velocity generator. Misiorowski has thrown 200 of the 202 fastest pitches recorded by any starter since 2008 launched Statcast, with his fastest at 105.5 mph (June 26, 2026). That single-game peak sits 0.3 mph behind Aroldis Chapman's all-time record of 105.8 mph set in September 2010. One prominent prediction circulating ahead of the postseason: Misiorowski will hit 106 mph before elimination from the bracket.

Here's why that prediction matters for betting: October baseball produces measurable adrenaline spikes in fastball velocity across the board. Chapman himself threw his fastest pitch in a playoff context. More importantly, a pitcher's velocity floor tends to rise 1-2 mph on average during postseason play, driven by shortened rest, higher emotional load, and smaller sample sizes that don't capture fatigue. Misiorowski is already operating at a velocity ceiling no starter has sustained. If he enters October throwing his fastest fastballs with fresh legs and playoff stakes, the probability of a single 106 mph reading—not sustained velocity, just one pitch—rises materially above his 0.5% regular-season frequency at that threshold.

The betting implication: Misiorowski's strikeout props will already be inflated by the market to reflect his elite velocity profile. But his fastball velocity will likely trend higher than his regular-season average, creating an efficiency gain that won't yet be priced into K-rates at his typical ratios. A Brewers pitcher facing a Wild Card opponent hasn't seen Misiorowski's October velocity signature; the oddsmakers have only regular-season data. His pitch-type distribution will also shift marginally toward more fastballs (relievers typically elevate fastball usage in high-leverage spots). That combination—higher fastball velocity plus increased fastball frequency—directly translates to strikeout volume compression on opposing hitters and to elevated K per 9 rates that linemakers haven't fully adjusted for yet.

Pete Crow-Armstrong's 40-40 season creates a separate narrative prop: a 4-4 postseason series (four home runs and four stolen bases in a single series). Only Lenny Dykstra (1993 World Series) and Carlos Beltrán (2004 NLCS) have done it. PCA will need the Cubs to advance past the Padres in the Wild Card and then past the Brewers in the NLDS to reach a best-of-seven NLCS where a 4-4 series becomes statistically feasible. The Cubs' path is narrow and requires winning at least two best-of-three and best-of-five series before the counting opportunity exists. This is a deep prop angle—one that doesn't land unless the Cubs clear two playoff hurdles—but it's the kind of narrative bet that markets underprice because it requires dependency on a team outcome first. Crow-Armstrong's 40-40 is locked in; a 4-4 series isn't.

For bettors, the Misiorowski angle is actionable today. His strikeout props in his first postseason start will reflect regular-season velocity baselines that have already been exceeded in isolated playoff moments. The velocity spike isn't guaranteed—one appearance isn't a sample—but the mechanism is sound and will fade within two or three starts once the market recalibrates. Crow-Armstrong's 4-4 series is purely narrative and carries high variance; it's a fun ticket, not an edge play.