MLB playoffs 2026: how to actually read win probabilities
October baseball is where casual money floods in and prices get emotional. A guide to reading playoff win probabilities like the market professionals do.
October is coming, and with it the season's biggest prediction markets — and its most emotional prices. A short guide to keeping your head when everyone else is pricing with their heart.
Baseball favourites are small favourites
In football a giant can be 80% against a minnow. Baseball doesn't do that: the best team in the sport wins about 60% of its games, and a "heavy" playoff favourite in a single game is maybe 58-62%. That means the underdog wins constantly — not as an upset, but as the base rate. A model's job in October is mostly to tell you how close to a coin flip the matchup truly is.
Short series amplify variance
A five-game series between a 55% and a 45% team ends with the weaker side advancing roughly a third of the time. Nobody choked; the sample was just tiny. When you see a price that implies certainty in a short series, someone is paying for a story.
Where the edges hide
Playoff rotations compress: aces pitch more of the innings, bullpens get stretched across consecutive days, and the starter effect our model prices all season gets bigger, not smaller. That's exactly the terrain where a pitcher-aware model earns its keep — and where casual October money moves prices off the fundamentals. The MLB board runs all postseason, every game, model vs market. Free during the beta.
Frequently asked questions
Are MLB playoff games harder to predict than regular season games?+
The best team in baseball still loses roughly a third of its games, and short series amplify that randomness — a five-game series is closer to a coin flip than most fans accept. Good models mostly tell you how close to 50/50 a playoff matchup really is.
Why do favourites seem to lose so often in the MLB postseason?+
Because 'favourite' in baseball means 55-60%, not 75%. A 58% favourite loses four times in ten — in a short series that's not an upset, it's the base rate doing its work.
Every fixture, fully modelled — the correct-score grid, the derived markets, and the written read.
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