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Bain Luck

Every game, election, and premiere has a number β€” the world's honest guess at what happens next. We find it, blend it, and show it clean.

60%
Celtics
vs
40%
76ers

Not β€œ-150 / +130” β€” just probabilities.

The same knowledge as a betting app. None of the pull.

You see exactly what the sharpest markets know β€” who's likely to win, what's likely to happen, how the odds are moving right now.

But there's zero enticement. No odds formats, ever. Nothing to deposit, nothing to buy. Just the probability, clean.

Six sources. One number.

Sportsbooks, ESPN, Kalshi, Polymarket, and live stat models each have a guess. We weight them by track record and blend them into a single probability β€” the whole market's honest opinion, not one book's.

Betting Odds (20+ books)61%
ESPN Win Probability58%
Kalshi63%
Polymarket59%
Bain Luck Aggregate60%
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And we grade ourselves in public: across nearly a million resolved outcomes, our numbers land within about two points of what actually happened.

Check our calibration

The score doesn't tell the full story.

A final score is one fact. The probability line is the whole night β€” every swing, every scare, every moment the outcome hung in the balance. Two nights the number saw more than the box score:

Tennis Β· 2026 Australian Open semifinal

Alcaraz won in five sets. So why did his odds run from 98% up two sets to 14% β€” the brink of elimination β€” before he won?

The score said

Final: Alcaraz d. Zverev 6-4, 7-6, 6-7, 6-7, 7-5.

The number knew
Adductor injury β€” 14%, the brink
Alcaraz win probability through the match (Polymarket)

A pre-match favorite around 84%, Alcaraz went up two sets and the market pushed him to 98%. Then an adductor injury β€” and across the next two sets it watched him crash to 14%, the edge of elimination, before he broke back in the fifth to win. $6.6M changed hands on Polymarket tracking every swing.

The scoreline says close. The probability line says he won, nearly lost, and won again. That's the night we show you.

Polymarket Β· atp-alcaraz-zverev-2026-01-30 Β· real price series, $6.6M volume

Golf Β· 2025 Masters, after Round 1

Two players were tied for the lead. Why did the market give one 24% and the other 9%?

The score said

End of Round 1: McIlroy and Burns both T1. Scheffler sat T6, a shot back.

The number knew
Win probability, end of Round 1 β€” Tied on the board β€” nearly 3Γ— apart in the market

The market gave McIlroy 24.4% and co-leader Burns just 8.6% β€” while Scheffler, below them on the board, drew 19.0%. A spot on the leaderboard isn't the same as the odds of winning.

McIlroy won. The board showed who was ahead; the number showed who was actually most likely to close.

DataGolf win-probability model + Kalshi futures

Every category, not just sports

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Built end to end by one person who thinks a clean probability is more honest β€” and more fun β€” than a betting slip.

The fine print

Bain Luck is for information and entertainment only. We don’t encourage or facilitate gambling. Probabilities are derived from publicly available market data and are not betting advice.

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