BetMGM vs BetRivers: where their odds disagree
Over the last 30 days, BetMGM and BetRivers quoted the same line at prices that summed to less than 100% on 15 game-markets — a cross-book arbitrage — with an average net edge of 2.96% and a peak of 13.74%. On plain vig, BetMGM is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: BetMGM vs BetRivers
| BetMGM | BetRivers | |
|---|---|---|
| Overall overround | 4.96% | 5.44% |
| Moneyline | 4.45% | 4.98% |
| Spreads | 4.65% | 5.33% |
| Totals | 5.58% | 5.81% |
| NFL | 4.39% | 5.00% |
| MLB | 4.81% | 5.36% |
| NBA | 4.60% | 5.57% |
| NHL | 4.56% | 5.52% |
| MLS | 8.73% | 6.44% |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 15 | 2.96% | 13.74% |
How big the edges were
Share of detections by net edge bucket. Most cross-book edges are small; the tail is where the money and the execution risk both live.
Recent examples
Best detection per game-market, most recent first. These windows have closed.
| Game | Market | Legs | Net edge | Detected |
|---|---|---|---|---|
| Philadelphia Phillies @ New York Mets · MLB | moneyline | New York Mets @ BetMGM + Philadelphia Phillies @ BetRivers | 0.75% | Sep 18, 8:34 PM ET |
| Miami Marlins @ Arizona Diamondbacks · MLB | spread 2.5 | Arizona Diamondbacks @ BetRivers + Miami Marlins @ BetMGM | 0.57% | Sep 16, 11:01 PM ET |
| Seattle Mariners @ Athletics · MLB | spread 1.5 | Athletics @ BetRivers + Seattle Mariners @ BetMGM | 7.07% | Sep 12, 1:06 AM ET |
| Texas Rangers @ Seattle Mariners · MLB | moneyline | Seattle Mariners @ BetMGM + Texas Rangers @ BetRivers | 0.48% | Sep 10, 4:45 PM ET |
| New York Mets @ Miami Marlins · MLB | spread 4.5 | Miami Marlins @ BetMGM + New York Mets @ BetRivers | 0.58% | Sep 8, 7:05 PM ET |
| New York Mets @ Miami Marlins · MLB | spread 2.5 | Miami Marlins @ BetMGM + New York Mets @ BetRivers | 1.23% | Sep 7, 2:43 PM ET |
| Arizona Diamondbacks @ Houston Astros · MLB | total 5.5 | Over @ BetRivers + Under @ BetMGM | 3.29% | Sep 6, 5:10 PM ET |
| Minnesota Twins @ Chicago White Sox · MLB | total 10.5 | Over @ BetRivers + Under @ BetMGM | 2.47% | Sep 5, 10:04 PM ET |
| Washington Nationals @ Los Angeles Dodgers · MLB | spread 2.5 | Los Angeles Dodgers @ BetRivers + Washington Nationals @ BetMGM | 1.38% | Sep 5, 9:34 PM ET |
| Detroit Tigers @ Cleveland Guardians · MLB | total 6.5 | Over @ BetRivers + Under @ BetMGM | 5.75% | Sep 5, 8:48 PM ET |
| Detroit Tigers @ Cleveland Guardians · MLB | spread 5.5 | Cleveland Guardians @ BetRivers + Detroit Tigers @ BetMGM | 5.75% | Sep 5, 8:48 PM ET |
| Tampa Bay Rays @ Texas Rangers · MLB | spread 3.5 | Tampa Bay Rays @ BetRivers + Texas Rangers @ BetMGM | 0.94% | Sep 3, 9:44 PM ET |
| Tampa Bay Rays @ Texas Rangers · MLB | total 5.5 | Over @ BetRivers + Under @ BetMGM | 2.81% | Sep 3, 9:44 PM ET |
| San Diego Padres @ Cincinnati Reds · MLB | moneyline | Cincinnati Reds @ BetMGM + San Diego Padres @ BetRivers | 0.30% | Aug 31, 3:45 PM ET |
| Tampa Bay Rays @ Detroit Tigers · MLB | total 5.5 | Over @ BetMGM + Under @ BetRivers | 13.74% | Aug 25, 8:40 PM ET |
Frequently asked questions
How often do BetMGM and BetRivers disagree?
In the last 30 days our scanner recorded 15 game-markets where BetMGM and BetRivers quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 16 scans. The average net edge was 2.96% and the largest 13.74%.
Which has lower vig, BetMGM or BetRivers?
BetMGM — BetMGM measures 4.96% overall and BetRivers measures 5.44% over 30 days of live lines. The per-market and per-sport breakdown is in the table above.
Does this mean I can make money betting both?
Not automatically. These are measurements of past disagreements at the moment they were detected. Lines move within minutes, displayed prices may not be available at your stake, both books must be accessible in your state, and neither book has to honor a stale price. ArbMonster shows the math; the execution and the risk are yours.
Which sports do BetMGM and BetRivers disagree on most?
MLB (15 game-markets, avg 2.96%).
← all sportsbooks · BetMGM · BetRivers · what arbitrage is · dutching calculator