What happens to your bet: settlement at a glance
How most US sportsbooks grade the main baseball markets when a game does not go as scheduled. House rules differ in the details, so check the rules of the book you use before you bet.
| Scenario | Moneyline | Run line and totals | First 5 innings | Player props |
|---|---|---|---|---|
| Game postponed or never starts | Void | Void | Void | Void |
| Called before it is official (5 innings, 4.5 if the home team leads) | Void | Void | Void | Usually void |
| Called after it is official, before 9 innings | Stands, graded on the score when play stopped | Usually void, unless the result was already decided | Stands once 5 innings are complete | Varies by book |
| Game goes to extra innings | Counts | Counts | Already settled after 5 | Counts |
| Listed starting pitcher is scratched | Action bets stand, listed-pitcher bets void | Same as moneyline | Same as moneyline | That pitcher's props void |
| Game is suspended and finished later | Stands if it finishes within the book window | Stands if it finishes within the book window | Stands if 5 innings were complete | Varies by book |
Green-gold: the bet stands. Pink: refunded. Grey: depends on the book or on whether the outcome was already decided. An over that is already over the total when a game is called usually wins; an under can never be decided early.
A baseball bet is a small contract, and the fine print decides more tickets than people expect. Games start late, get stopped by rain, lose their scheduled starter an hour before first pitch or stretch into the thirteenth inning. Each of those situations has a rule behind it, and most arguments about “that bet should have paid” come down to one of the rules on this page.
One thing up front: every sportsbook writes its own house rules. What follows is how baseball betting rules usually work at US books, not a promise of how yours works. We point out where books tend to differ so you know which lines of your book’s rules page to read. For how the bets themselves are priced, start with our guide to baseball betting lines.
Listed pitchers vs action
The starting pitcher shapes the price of an MLB game more than any other player, so books tie most full-game bets to the scheduled starters.
When you bet with listed pitchers, both named starters must start for the bet to have action. If either one does not, the bet is void and your stake comes back. Some books offer a middle option where only the pitcher for your side must start.
When you bet with action, the wager stands no matter who takes the mound. If the starter changes, the book may adjust the odds to reflect the new matchup, and you get paid at the adjusted price rather than the one you saw when you bet.
What counts as a start
Books generally define the starter as the pitcher who throws the first pitch for his team. That matters in the modern game, where some clubs use an “opener”, a reliever who pitches the first inning before the listed bulk pitcher comes in. If the opener was the listed pitcher, the bet has action. If the book listed the bulk pitcher and the opener starts instead, a listed-pitcher bet can be voided. Check the pitcher names on your ticket, not just the team names.
Pitcher changes void bets
A late scratch is the most common way a baseball bet gets refunded. A starter wakes up with a stiff back, the team announces a change two hours before first pitch, and every listed-pitcher bet on that game is void. Sometimes that is good news, if the price had moved against you. Sometimes it cancels a bet you liked. The fix is to check the confirmed starters on our MLB probable pitchers board before you bet, and again before first pitch if you bet early.
How long a game must last
Moneyline bets
Most books follow MLB’s official game rule for the moneyline. A game becomes official after five innings, or after four and a half if the home team is leading, because the home team would not need its turn at bat. If rain ends the game after that point, the moneyline is graded on the score when play stopped.
Run lines and totals
Run line and total bets usually need more. The common standard is nine innings, or eight and a half if the home team leads. A game called in the seventh has an official winner, but the total and the run line have no action and are refunded. The logic is simple: a total of 8.5 set for nine innings makes no sense over seven.
There is one frequent exception. If a total has already been decided before the game is stopped, for example the over already cleared with 10 runs in, some books grade it as a winner anyway. Others void it. This is exactly the sort of detail that varies by book. Partial-game markets like first five innings follow their own length rule, explained on our first 5 innings page, and first-inning bets like those on our NRFI page only need the first inning completed.
Suspended games
MLB suspends a game when play has to stop and cannot be finished that day. Under the league’s current rules, a regular-season game halted by weather before it becomes official is suspended and resumed later from the exact point of stoppage, instead of being wiped out and replayed. A game that is official but tied when it is called is also suspended.
Betting treatment is where MLB suspended game betting rules get complicated, because the league’s rule and the sportsbook’s rule are two different things. The pattern at many books looks like this. If the game was already official when it was suspended, moneyline bets are graded on the score at the time of suspension. If it was not official, bets are void unless the game is completed within a window the book sets, often the same day or within a day or two. A game resumed a week later usually means refunds at most books, even though it counts in the standings. Your own book’s rules on MLB suspended game betting are the only version that matters for your ticket.
Postponements, rainouts and doubleheaders
A game postponed before the first pitch is usually void at every book. The rescheduled game is a new event with new lines, even if it is played the next afternoon as the first half of a doubleheader.
Doubleheaders themselves are straightforward. Game 1 and Game 2 are separate events with separate prices. A bet on Game 1 stays with Game 1, and if Game 2 is postponed, only Game 2 bets are affected. The thing to watch is which game your ticket refers to, because the lines can look almost identical and the starters are usually different.
Extra innings
Extras count. Unless your bet is specifically for a set number of innings, runs scored in the tenth or later count toward the moneyline, the run line and the total. In the regular season, each extra inning starts with a runner on second, which makes scoring more likely, a detail that matters to over bettors and to home favorites laying -1.5. Our MLB over/under guide and our run line guide cover how that runner changes those two markets.
Dead heat
Dead heat rules apply when more than one winner ties for a result you bet on. Imagine a future on the league home run leader where two players finish tied. Instead of paying you in full, the book divides your stake by the number of tied winners and pays that portion at full odds. A $20 bet at +800 in a two-way tie becomes $10 at +800, which returns $90, while the other $10 is lost. You will run into dead heats mostly on baseball futures and on some player markets on the MLB prop bets page.
Reading your own book’s house rules
Every book publishes a sports rules page, and the baseball section is usually a few hundred words. It is worth ten minutes before your first bet. Look for four things: how it handles listed pitchers, how many innings run lines and totals need, what it does with suspended games and how long the completion window is, and whether it grades a total that is already decided when play stops.
Two more rules sit above all of that. Sports betting in the US is legal only in states that have authorized it, and the rules on who can bet and where differ from state to state. Most of those states set the minimum age at 21, so assume 21+ unless your state says otherwise. Set a budget before you bet and treat it as the cost of entertainment; if you or someone you know needs help, call 1-800-GAMBLER. For odds math and payout checks, our betting calculators are free to use, and our baseball betting guide covers the basics of the sport’s markets.
