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Same game parlay correlation, explained

By JB, Slip Surgeon · Updated Oct 26, 2026

A same game parlay (SGP) looks like a normal parlay with legs from one game. It isn't priced like one. Legs from the same game are correlated: one leg landing changes the chance of the others. Books know this, which is why your SGP pays less than multiplying the legs.

What correlation means for a parlay

Two legs are positively correlated when one landing makes the other more likely. They're negatively correlated when one landing makes the other less likely. Legs from different games are close to independent, so the parlay price is just the legs multiplied. Inside one game, that shortcut breaks.

Common positive pairs

• NFL: a quarterback over passing yards with his top receiver over receiving yards. The same completions count for both.
• NFL: a lead running back over rushing yards with his team on the moneyline. Teams that lead run the ball late.
• NBA: a point guard over assists with a teammate over points. Assists need someone to make the shot.
• NBA: a game total over with a high-usage scorer over points.

Common negative pairs (the ones that quietly hurt you)

• NFL: a running back over rushing yards with his quarterback over a big passing number. The scripts that produce each are usually different games.
• NFL: a game total under with a wide receiver over a high receiving line.
• NBA: two teammates both over big rebound lines. There are only so many boards.
• NBA: a star over points with his team's total under.

Negative pairs don't make a slip impossible, but the book prices the combination as less likely than the multiplied legs suggest, and you're asking for two things that pull against each other.

How books price an SGP

FanDuel and BetMGM price same game parlays with their own models of how legs move together, then add their margin. The result is a payout below the multiplied price for positively correlated legs. That gap is partly correlation and partly extra margin, and from the outside you can't fully separate the two. You can see the size of the adjustment, though: put the same legs in the parlay calculator as if they were independent and compare with the SGP price your book shows.

BetMGM and FanDuel differences

FanDuel lets you combine most player props and game lines from one game into an SGP. BetMGM combines same-game legs through its bet builder, and only some markets are eligible. When the bet slip checker loads a same-game slip, legs from one game go in as a Same Game Parlay and the book sets the final price; if BetMGM can't combine a leg, the checker tells you.

How to use correlation without fooling yourself

1. Start from a game read. Decide how you think the game goes (fast pace, a blowout, a passing script), then pick legs that fit that one story.
2. Each leg still needs its own case. Correlation doesn't rescue a leg you wouldn't bet alone.
3. Cut legs that need a different game. If one leg needs a shootout and another needs a grind, one of them goes.
4. Keep it short. Three legs that tell one story beat six that tell three.

Frequently asked questions

Are same game parlays worse than regular parlays?

They aren't automatically worse, but they're priced differently. Books adjust SGP payouts for correlation and margin, so the price is usually below the multiplied legs.

Why does my same game parlay pay less than the legs multiplied?

Because the legs are linked and the book prices that link (plus margin). Positively correlated legs are more likely to land together than independent legs, so the payout is cut.

Check your own slip

Slip Surgery runs these checks on any NBA or NFL slip for free, then loads it into FanDuel or BetMGM.

Keep reading

Model picks, not locks. No checker can tell you a slip will win; it can only show you the price, the math and what changed. 21+ only. If betting stops being fun, call 1-800-GAMBLER or read our responsible gaming page.