Bet the MLB run line when you think a favorite wins by 2+ runs or an underdog loses by 1 or wins outright. Bet the moneyline for any other side selection. Which market has better EV depends on the price and your probability of winning by 2+ runs, so compare the break-even probability of each price.
The Short Answer
The MLB run line is almost always set at ±1.5 runs. The favorite at -1.5 must win by 2+. The underdog at +1.5 covers by winning outright OR losing by exactly 1 run. The moneyline is the straight pick on who wins.
Bet the run line on heavy favorites when you think they win by 2+ at least 50%+ of the time (run line -1.5 at +100 to +130 beats moneyline at -200+). Bet the moneyline on plus-money dogs because the upside is bigger and the run line cap of +1 isn't worth giving up.
The Math Comparison
Heavy favorite example: Team A is -200 ML / -1.5 RL +110.
Moneyline: need 66.7%+ true win probability to break even. Example assumption: a 70% true win probability (an assumption, not a measured rate).
Run line -1.5 at +110: need 47.6%+ true probability of winning by 2+. Example assumption: a 52% chance of winning by 2+ runs (an assumption, not a measured rate).
Per $100 wagered, using those assumed rates: ML expected profit is 0.70 × $50 - 0.30 × $100 = +$5. RL expected profit is 0.52 × $110 - 0.48 × $100 = +$9.20. RL comes out ahead by about $4.20 per $100 wagered, and only if the 52% assumption holds.
When the Run Line Is Better
Heavy favorite (ML -180 or worse) at home. Home favorites win by 2+ more often than road favorites. RL -1.5 often gets to +100 to +130 prices that beat the ML EV.
Pitcher mismatch. Ace facing back-end starter. Ace's team wins by 2+ at high rate. RL -1.5 at +130 needs only a 43.5% chance of winning by 2+ to break even.
Hitter park + lineup edge. Favored team's offense vs weak SP in a hitter park. Multi-run wins likely. RL -1.5 better than ML.
Underdog with closing speed. Dog at +130 ML but you think they have real upset equity AND won't lose by 2+ even when they lose. RL +1.5 at -160 gives you covers on outright wins AND 1-run losses. It needs a 61.5% cover rate to break even, versus 43.5% for the +130 moneyline.
When the Moneyline Is Better
Plus-money dogs at +130 or higher. RL +1.5 at -160 caps the upside. Better to take dog ML straight up at +135-+170 for the bigger profit per win.
Mild favorites (-110 to -140 ML). RL -1.5 prices balloon to +180 or higher because the favorite isn't favored enough to win by 2+ consistently. ML usually has better EV.
Tight pitcher duels. Total 7.5 or lower. One-run games likely. Favorites win by 2+ rarely. ML better than RL -1.5 (and dog RL +1.5 better than dog ML).
Bullpen game on favorite's side. Bullpens often give up late runs. Favorite might win 4-3 instead of 5-2. RL -1.5 misses.
Run Line vs Moneyline Decision Tree
Is the favorite -180 or worse on the ML? → Check the RL -1.5 price. If +100 or better AND you think they win by 2+ at 50%+ probability, take RL.
Is the dog +120 to +180? → Compare ML profit per win to RL +1.5 profit per win. ML usually wins on EV per $100.
Is the game total 7.5 or lower? → Tight game expected. ML for the side you like; skip RL.
Is the game total 9.5 or higher? → Multi-run game expected. RL viable for either side.
Is one side heavily favored to grind out a single-run win? → ML for that side. RL -1.5 unlikely to cash.
Break-Even Hit Rates by Combination
Favorite ML at -150: break-even hit rate 60.0%
Same favorite RL -1.5 at +135: break-even hit rate 42.6%
Favorite ML at -200: break-even hit rate 66.7%
Same favorite RL -1.5 at +110: break-even hit rate 47.6%
Dog ML at +150: break-even hit rate 40.0%
Same dog RL +1.5 at -160: break-even hit rate 61.5%
How Bookie Bullies Decides RL vs ML
Bookie Bullies retired its MLB run line picks on 2026-09-19 and no longer publishes them, so this page is education only. The site publishes first-inning reads on the first-inning page and moneyline picks under strict gates on the daily picks page.
Frequently Asked Questions
Should I bet the MLB run line or moneyline?
Bet the MLB run line when you think a favorite wins by 2+ runs (RL -1.5 at +100-+130 beats moneyline at -200+) or an underdog loses by 1 or wins outright (RL +1.5 at -150-160 captures both outcomes). Bet the moneyline for plus-money dogs above +130 (better upside than RL cap) and mild favorites (-110 to -140 ML where RL prices balloon).
Is the run line better than the moneyline for MLB favorites?
The run line is better than the moneyline for HEAVY favorites (ML -180 or worse) when RL -1.5 prices are +100 to +130 AND the favorite has 50%+ probability of winning by 2+. The moneyline is better for mild favorites (-110 to -140) because RL -1.5 prices balloon to +180+ when the favorite isn't favored enough.
What's a good MLB run line strategy?
Best MLB run line strategy: target heavy favorites at home in pitcher mismatches or hitter parks with offensive lineup edges (RL -1.5 at +100-130). Target plus-money dogs in tight pitcher duels where 1-run losses are common (RL +1.5 at -150-160). Avoid RL -1.5 on mild favorites and RL +1.5 on heavy dogs.
How often does the MLB favorite cover -1.5 run line?
Favorites cover -1.5 less often than they win outright, because they must win by two or more runs. The cover rate rises with favorite size, which is why heavy favorites have better RL EV than mild ones.
Are MLB run line bets profitable?
Random run line bets lose to vig, and this page makes no claim that run line betting is reliably profitable. Bookie Bullies retired its own MLB run line picks on 2026-09-19 because they hit below the break-even rate.