Favorites vs Underdogs: How to Actually Think About Betting Either Side
What Makes a Fighter or Team the Favorite
The favorite is simply the side the market thinks is more likely to win, reflected in odds like -200 or -400 rather than a plus number. Sportsbooks set these prices based on a mix of statistical models, public perception, and how money is being wagered, which means the favorite’s price is a probability estimate, not a guarantee. A -400 favorite is priced to win roughly 80% of the time in theory, which also means they lose about one in five times at that price — a fact that’s easy to forget when a favorite feels “obviously” better.
What Makes a Fighter or Team the Underdog
The underdog is priced with a plus number like +150 or +300, reflecting the market’s view that they’re less likely to win but will pay out more if they do. An underdog doesn’t need to be bad to be priced as one — sometimes it just means the market slightly favors the other side, or that public perception is inflating the favorite’s price beyond what the true probability supports.
“Favorite” and “underdog” are relative labels about market perception, not fixed judgments about quality. A -150 favorite and a +130 underdog represent a fairly close matchup — the labels can make the gap feel bigger than the actual odds suggest.
Why Favorites Aren’t Automatically the “Safe” Bet
Backing favorites feels intuitively safer, but the math doesn’t always agree. Heavy favorites require risking a lot to win a little, which means a single unexpected loss can wipe out the profit from several correct favorite bets. If you bet five -400 favorites and win four of them, you’re roughly breakeven or worse once the vig is factored in, despite an 80% win rate — because the payout on each win is small relative to the risk on each bet.
This is why “favorites win more often” and “favorites are profitable to bet” are two different claims. The first is often true. The second depends entirely on whether the price accurately reflects the true win probability, which is exactly what a sportsbook is trying to get right.
Why Underdogs Aren’t Automatically “Value”
The flip side of the favorite trap is assuming underdogs are inherently good bets because of the bigger payout. Underdogs lose more often than they win by definition, and a long-shot underdog at +400 still needs to win roughly 20% of the time just to break even over the long run. Chasing underdog payouts without a real analytical reason the market is underpricing that side is just as much a mistake as blindly backing favorites.
| Odds | Implied Probability | Break-Even Win Rate |
|---|---|---|
| -400 | 80.0% | 80.0% |
| -150 | 60.0% | 60.0% |
| +130 | 43.5% | 43.5% |
| +300 | 25.0% | 25.0% |
The break-even win rate is just the implied probability from the odds. Betting either side profitably over time means winning more often than that number, not just picking whichever side “feels” right. Our guide to the vig covers why the real break-even point is slightly higher than the pure implied probability once the sportsbook’s cut is factored in.
How to Actually Evaluate Either Side
Ask what the market might be missing, not just what it’s saying. A price only tells you the market’s current view — the useful question is whether that view is missing something you can identify, like a stylistic mismatch, a recent change, or public money skewing the line.
Don’t let the label do your thinking for you. “Favorite” and “underdog” are just names for which side of even money a bet falls on — treat every price as a probability estimate to evaluate, not a verdict to accept.
Track your results by side, not just overall. If you notice you’re consistently losing money on favorites or underdogs specifically, that’s a useful signal about a bias in how you’re evaluating one side or the other.
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Frequently Asked Questions
Neither is inherently better — profitability depends on whether the price accurately reflects the true probability of winning, not on which side of even money the bet falls on. Both favorites and underdogs can be good or bad bets depending on the specific matchup.
Because the payout on a heavy favorite is small relative to the amount risked, a single loss can erase the profit from several wins. A high win rate doesn’t automatically mean a profitable betting strategy once the payout size is factored in.
It means the market has pushed the favorite’s odds higher than their true win probability likely supports, often due to public perception or lopsided betting action, which can make the underdog a better value bet at that specific price.
Compare the underdog’s price to your own estimate of their true win probability. If you believe they win more often than the implied probability from the odds suggests, that’s the basic definition of a value bet on that side.
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About the Author
Rob Brown has been betting on MMA professionally since 2015. Every pick is publicly recorded and independently verified — no cherry-picking, no deleted bets. His full record is tracked at betMMA.tips and bettin.gs.
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