MLB Run Line vs Moneyline Which to Bet

For most favorites, most of the time, take the moneyline. Laying -1.5 only makes sense when the extra payout covers the wins you give back by exactly one run, and you can check that with one division before you bet.

The run line isn't a cheaper way to back a good team. You pay for the plus-money price by giving up every one-run win, and about 28% of MLB games end by one run, according to BetMGM's explainer and BettingUSA. Covers puts the figure closer to 30%. That's a large slice of outcomes, and the price has to earn it back.

The moneyline asks one question: does your team win? It doesn't care whether the margin is one run or eight, and that's its advantage. A favorite that holds on 3-2 pays you exactly the same as one that wins 9-1.

The weakness is the price. In Michael Shackleford's study of 4,929 games from the 2016 and 2017 seasons at Wizard of Odds, moneyline favorites returned 97.79% of the money wagered. That was the worst of the four moneyline groups he measured. Underdogs returned 98.49%, road teams 98.30% and home teams 97.99%. Laying chalk costs something, and his figures show how much.

The cost also depends on how wide the line is. Shackleford puts the theoretical house edge at 2.38% on a 10-cent moneyline, 3.49% on 15 cents and 4.55% on 20 cents. That makes shopping for the tighter line part of the bet itself.

Who should bet it: anyone who rates the favorite to win but has no specific reason to think the game won't be close.

The run line is baseball's point spread, fixed at 1.5 runs. Books don't move the number from game to game. They move the price. That's why a -170 moneyline favorite turns into roughly +120 at -1.5 in BetMGM's example, and a -190 favorite becomes about +130 in OddsShopper's.

What it does well is turn an expensive favorite into a plus-money bet. The real case for it comes from Covers. If you strongly back a heavy favorite, the run line beats laying a big negative number, provided you've done the work on starting pitchers, lineups, home and road splits, injuries and weather and concluded the game is likely to be lopsided. That argument is reasonable, and it's correct for the games it describes.

The trouble is that it doesn't describe the average game. In the same Wizard of Odds sample, run-line favorites at 20-cent lines returned 96.90%, against 97.79% for moneyline favorites. The plus-money price felt better and paid worse.

The vig also differs by book. As of BettingUSA's September 22, 2026 update, its average run line vig was 3.79% at DraftKings, 4.05% at Caesars, 4.15% at BetMGM and 4.38% at FanDuel.

Who should bet it: someone with a specific reason to expect a multi-run win, who has checked the price against the test below.

Both bets lose when the favorite loses. So the comparison only covers the games the favorite wins, and in those games just one thing separates the two bets: whether the margin was exactly one run. That gives you a simple threshold.

Take the moneyline's total return on $100, divide it by the run line's total return on $100, and subtract the result from 1. The answer is the largest share of the favorite's wins that can come by exactly one run before the run line becomes the worse bet. If you think fewer of its wins will be one-run wins, lay the -1.5. If you think more will be, take the moneyline.

Use that 28% to 30% figure as a rough anchor, not as the answer. It counts all games, not the share of a particular favorite's wins, and none of the sources here break it down that way. Your estimate for a specific game has to come from the matchup: a starter mismatch, a tired opposing bullpen, a total that points to runs. For the bullpen piece, the relief usage numbers do more work than most bettors give them credit for.

The second thing that separates the bets is how the price is built. Shackleford's fair run-line tables, fitted on 2000 to 2009 data, value +1.5 more on an away underdog than on a home underdog of the same strength. In other words, -1.5 on a home favorite is the weaker side of that pair. His worked example, a Yankees at Red Sox game from April 6, 2010, put the house edge at 4.20% on one side of the run line and 0.79% on the other. A moneyline gets priced much closer to even on both sides. A run line can hide a lopsided margin on the side you want, which the straight bet calculator will show you if you enter both prices.

The third is the postseason, where near coin-flip moneylines can come with unbalanced run lines. Sportsbetting.legal listed ALDS Game 3 at Guardians -102 and White Sox -118, with White Sox -1.5 at +185. That's the same game priced two ways, and the threshold test above works on both.

Bet the moneyline by default. The best long-run evidence here, Wizard of Odds' 4,929-game sample, had moneyline favorites returning 97.79% against 96.90% for the same teams at -1.5. That gap is the cost of all those one-run wins.

Switch to the run line only when two things hold. First, the threshold from your two prices sits above your honest estimate of how often this favorite wins by exactly one. Second, you've found the book with the lowest vig for that game. A road favorite at a steep price, such as the -190 to +130 example, is where the run line most often clears the bar. A home favorite at a modest price, such as the Dodgers at -154 to +120, rarely does, because you'd need three of every four of its wins to come by two runs or more.

If you want more distance from the favorite than -1.5 gives, moving to -2.5 changes the math again. The same moneyline, run line and totals reasoning, applied to all three markets together, is set out in the full game-level framework.