BetMGM vs Fanatics Sportsbook: where their odds disagree
Over the last 30 days, BetMGM and Fanatics Sportsbook quoted the same line at prices that summed to less than 100% on 70 game-markets — a cross-book arbitrage — with an average net edge of 4.12% and a peak of 12.05%. On plain vig, Fanatics Sportsbook is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: BetMGM vs Fanatics Sportsbook
| BetMGM | Fanatics Sportsbook | |
|---|---|---|
| Overall overround | 4.96% | 4.75% |
| Moneyline | 4.45% | 4.54% |
| Spreads | 4.65% | 4.91% |
| Totals | 5.58% | 4.80% |
| NFL | 4.39% | 4.65% |
| MLB | 4.81% | 4.87% |
| NBA | 4.60% | 4.64% |
| NHL | 4.56% | 4.73% |
| MLS | 8.73% | — |
Disagreements by sport
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 |
|---|---|---|---|---|
| Miami Marlins @ San Diego Padres · MLB | spread 5.5 | Miami Marlins @ BetMGM + San Diego Padres @ Fanatics Sportsbook | 6.05% | Sep 18, 11:23 PM ET |
| Kansas City Royals @ Pittsburgh Pirates · MLB | spread 1.5 | Kansas City Royals @ Fanatics Sportsbook + Pittsburgh Pirates @ BetMGM | 5.35% | Sep 18, 6:46 PM ET |
| Philadelphia Phillies @ New York Mets · MLB | total 3.5 | Over @ Fanatics Sportsbook + Under @ BetMGM | 4.76% | Sep 17, 9:34 PM ET |
| San Diego Padres @ Colorado Rockies · MLB | total 12.5 | Over @ Fanatics Sportsbook + Under @ BetMGM | 1.11% | Sep 17, 3:43 PM ET |
| Los Angeles Dodgers @ Cincinnati Reds · MLB | total 9.5 | Over @ Fanatics Sportsbook + Under @ BetMGM | 7.27% | Sep 16, 9:14 PM ET |
| Atlanta Braves @ Chicago Cubs · MLB | moneyline | Atlanta Braves @ BetMGM + Chicago Cubs @ Fanatics Sportsbook | 0.75% | Sep 16, 8:59 PM ET |
| Philadelphia Phillies @ Washington Nationals · MLB | spread 3.5 | Philadelphia Phillies @ Fanatics Sportsbook + Washington Nationals @ BetMGM | 3.61% | Sep 16, 7:13 PM ET |
| Miami Marlins @ Arizona Diamondbacks · MLB | total 8.5 | Over @ BetMGM + Under @ Fanatics Sportsbook | 1.23% | Sep 15, 10:04 PM ET |
| Miami Marlins @ Arizona Diamondbacks · MLB | moneyline | Arizona Diamondbacks @ Fanatics Sportsbook + Miami Marlins @ BetMGM | 2.65% | Sep 15, 10:04 PM ET |
| Miami Marlins @ Arizona Diamondbacks · MLB | spread 1.5 | Arizona Diamondbacks @ BetMGM + Miami Marlins @ Fanatics Sportsbook | 0.54% | Sep 15, 4:39 PM ET |
| Seattle Mariners @ Los Angeles Angels · MLB | moneyline | Los Angeles Angels @ Fanatics Sportsbook + Seattle Mariners @ BetMGM | 2.79% | Sep 15, 12:20 AM ET |
| Seattle Mariners @ Los Angeles Angels · MLB | total 11.5 | Over @ BetMGM + Under @ Fanatics Sportsbook | 0.66% | Sep 14, 10:48 PM ET |
| San Diego Padres @ San Francisco Giants · MLB | spread 1.5 | San Diego Padres @ BetMGM + San Francisco Giants @ Fanatics Sportsbook | 1.31% | Sep 13, 10:38 PM ET |
| San Diego Padres @ San Francisco Giants · MLB | total 10.5 | Over @ Fanatics Sportsbook + Under @ BetMGM | 1.96% | Sep 13, 10:22 PM ET |
| Green Bay Packers @ Minnesota Vikings · NFL | spread 4.5 | Green Bay Packers @ BetMGM + Minnesota Vikings @ Fanatics Sportsbook | 6.54% | Sep 13, 7:05 PM ET |
Frequently asked questions
How often do BetMGM and Fanatics Sportsbook disagree?
In the last 30 days our scanner recorded 70 game-markets where BetMGM and Fanatics Sportsbook quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 71 scans. The average net edge was 4.12% and the largest 12.05%.
Which has lower vig, BetMGM or Fanatics Sportsbook?
Fanatics Sportsbook — BetMGM measures 4.96% overall and Fanatics Sportsbook measures 4.75% 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 Fanatics Sportsbook disagree on most?
MLB (66 game-markets, avg 4.18%); NFL (4 game-markets, avg 3.09%).
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