MLB Run Line Betting
The run line is baseball's version of the spread, and it is almost always fixed at 1.5 runs. The favourite is -1.5 and must win by two or more; the underdog is +1.5 and covers if they lose by exactly one run or win outright. Prices are fixed odds in rand and settle once the game is official.
How the 1.5 runs work
Take a -1.5 favourite: a one-run win is not enough, they must win by two or more to cash. The +1.5 underdog is the mirror image, covering on any win and on a one-run loss. Because most MLB run lines sit at the same 1.5, the variable you are really betting is the price attached to it, not the number. Check the live line at the sportsbook.
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When the run line beats the moneyline
If you are confident a strong favourite will win comfortably, laying -1.5 pays more than the short moneyline price. The trade-off is real: you give up the one-run wins, and baseball is full of tight, late-decided games. Backing an underdog at +1.5 does the opposite, shortening the price in exchange for a buffer. Weigh the extra odds against how often that team actually wins by two. Back to MLB betting or the wider baseball betting section.
Frequently asked questions
Why is the MLB run line almost always 1.5?
Baseball is a low-scoring, one-run-margin sport, so 1.5 is the natural half-run line that splits a one-run game from a two-run game. Books adjust the odds rather than the number, though some offer alternate run lines at different prices.
Does the run line beat the moneyline?
Only when you expect a comfortable margin. Laying -1.5 pays more than the moneyline but loses on one-run wins; taking +1.5 is safer but pays less. It depends on the matchup, not a fixed rule.