Moneyline: how does betting on the winner work?

What is the Moneyline?

The Moneyline is the market on the winner of the match, usually with two outcomes. Unlike 1X2, it usually doesn't build in a third outcome for a draw.

It's the standard result market in tennis, where the format of the game rules out a draw, and one of the most common result markets in basketball.

How to read moneyline odds: the minus and plus signs

US sportsbooks quote the moneyline in American odds, built around a $100 reference: a minus sign for the favorite, a plus sign for the underdog.

• Negative odds (the favorite). The number is the stake needed to win $100 of profit. At −154, you stake $154 to win $100.
• Positive odds (the underdog). The number is the profit on a $100 stake. At +130, a $100 stake wins $130.

In both cases the stake comes back on top of the profit when the bet wins. The bigger the negative number, the heavier the favorite; the bigger the positive number, the longer the shot. The conversion between American, decimal and fractional odds is detailed on the odds formats page.

Moneyline vs point spread

The moneyline asks only who wins; the point spread asks by how much. On a spread, the favorite has to win by more than the posted number of points and the underdog can lose by less than it. NFL and NBA spreads are therefore usually priced close to even money on both sides (often around −110), while moneyline prices move further apart as the gap between the two teams grows. On a whole-number spread, a final margin landing exactly on the line is a push: the stake is refunded. Baseball's run line and hockey's puck line work differently: they are usually fixed at 1.5, and it's the price that varies. A heavy favorite at −300 on the moneyline may sit at −110 on a 7.5-point spread: same game, two different questions.

Moneyline vs 1X2: what changes

The key difference between Moneyline and 1X2 comes down to the number of outcomes and whether the draw is possible.

Extra-time rules aren't universal: they vary by sport and by operator, on the Moneyline just as on 1X2. Always check the exact market rules before betting rather than assuming they match what you saw on a different market.

Example: a tennis Moneyline

In a tennis match, two players, two possible outcomes: the Moneyline applies directly, with no need for a draw.

On a $15 stake placed on Player A at 1.65 in decimal (about −154 in American odds), a win for that player returns $24.75 ($15 × 1.65), a net profit of $9.75. The same $15 on Player B at +130 would return $34.50 ($15 × 2.30), a net profit of $19.50. If Player B wins instead of Player A, the $15 stake on Player A is lost in full — there's no in-between outcome on this two-way market, unlike 1X2 where a draw breaks the all-or-nothing logic. The same arithmetic applies whichever side is the favorite: only the odd, and therefore the size of the potential profit, changes.

As with any market, these two odds convert into implied probabilities. The detail of that conversion is explained on the page dedicated to implied probability.

Edge cases: tennis retirement and basketball overtime

Retirements and interrupted play come up often enough on a two-outcome, no-draw market that operators write dedicated settlement rules for them.

In tennis, a player retiring mid-match is the most common edge case on a Moneyline. If a player retires before the match is finished, most operators void and refund bets as long as too few games or sets have been played; past a threshold set by the operator, often the end of a full set, the bet can instead be settled on the score reached at the point of retirement, with the retiring player's opponent declared the winner. The exact rules vary noticeably from one operator to another and should always be checked before betting.

In basketball, overtime is generally included in Moneyline settlement, unlike soccer, where a result market usually covers regulation time only. The reason is simple: a basketball game never ends on a tie, so the Moneyline market follows the final result, overtime included, unless stated otherwise by the operator. A match stopped before full time for a reason unrelated to play — a security incident, an equipment failure — generally follows the same logic as a tennis retirement: refunded if the operator's settlement threshold isn't reached.

Margin and implied probability on the Moneyline

Like any odds market, the Moneyline reads with the same tools as 1X2 or a handicap: every odd contains a margin, and margin is the mechanism, not a sign that anything unusual is happening on that particular price. In the example above, −154 and +130 (1.65 and 2.30 in decimal) correspond to implied probabilities of 60.6% and 43.5%. For a negative American odd, the implied probability is 154 ÷ (154 + 100); for a positive one, 100 ÷ (130 + 100). Together they total 104.1%: that 4.1-point excess is the sportsbook's margin, whose general calculation is explained on the sportsbook margin page. On a two-way market with no draw to spread the margin across, that excess is concentrated on just two prices instead of three.

How OddScore uses the Moneyline market

OddScore tracks the prices offered on the Moneyline market by dozens of sportsbooks, in tennis and basketball, removes their margin and compares how they evolve over time.

The goal isn't to predict the outcome of the match, but to make it easier to read how the market prices each of the two outcomes, and how that pricing evolves up to kickoff.

Understand how OddScore analyzes odds movements →

Put it into practice

Apply this guide to real odds.

Dig into the market

Odds movements are only part of the story. Here are the next topics to read.

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