BetMGM vs DraftKings: where their odds disagree
Over the last 30 days, BetMGM and DraftKings quoted the same line at prices that summed to less than 100% on 48 game-markets — a cross-book arbitrage — with an average net edge of 4.22% and a peak of 13.33%. On plain vig, DraftKings is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: BetMGM vs DraftKings
| BetMGM | DraftKings | |
|---|---|---|
| Overall overround | 4.96% | 4.54% |
| Moneyline | 4.45% | 4.28% |
| Spreads | 4.65% | 4.66% |
| Totals | 5.58% | 4.69% |
| NFL | 4.39% | 4.57% |
| MLB | 4.81% | 4.65% |
| NBA | 4.60% | 4.58% |
| NHL | 4.56% | 4.33% |
| MLS | 8.73% | — |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 48 | 4.22% | 13.33% |
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 |
|---|---|---|---|---|
| Athletics @ Cleveland Guardians · MLB | moneyline | Athletics @ DraftKings + Cleveland Guardians @ BetMGM | 9.45% | Sep 18, 8:19 PM ET |
| San Diego Padres @ Colorado Rockies · MLB | total 11.5 | Over @ DraftKings + Under @ BetMGM | 2.72% | Sep 17, 5:45 PM ET |
| San Diego Padres @ Colorado Rockies · MLB | total 14.5 | Over @ BetMGM + Under @ DraftKings | 0.57% | Sep 16, 10:30 PM ET |
| San Francisco Giants @ St. Louis Cardinals · MLB | total 5.5 | Over @ BetMGM + Under @ DraftKings | 1.98% | Sep 16, 2:23 PM ET |
| New York Yankees @ Minnesota Twins · MLB | spread 2.5 | Minnesota Twins @ DraftKings + New York Yankees @ BetMGM | 2.96% | Sep 15, 8:47 PM ET |
| Seattle Mariners @ Athletics · MLB | total 22.5 | Over @ BetMGM + Under @ DraftKings | 10.85% | Sep 13, 12:17 AM ET |
| Seattle Mariners @ Athletics · MLB | spread 19.5 | Athletics @ DraftKings + Seattle Mariners @ BetMGM | 12.84% | Sep 13, 12:17 AM ET |
| Pittsburgh Pirates @ Chicago Cubs · MLB | total 8.5 | Over @ DraftKings + Under @ BetMGM | 8.95% | Sep 12, 3:53 PM ET |
| Kansas City Royals @ Boston Red Sox · MLB | moneyline | Boston Red Sox @ DraftKings + Kansas City Royals @ BetMGM | 10.89% | Sep 11, 10:03 PM ET |
| Colorado Rockies @ New York Yankees · MLB | spread 5.5 | Colorado Rockies @ BetMGM + New York Yankees @ DraftKings | 9.85% | Sep 9, 9:20 PM ET |
| Los Angeles Angels @ Boston Red Sox · MLB | total 9.5 | Over @ DraftKings + Under @ BetMGM | 3.01% | Sep 9, 9:05 PM ET |
| New York Mets @ Miami Marlins · MLB | total 12.5 | Over @ DraftKings + Under @ BetMGM | 0.58% | Sep 9, 7:49 PM ET |
| New York Mets @ Miami Marlins · MLB | total 9.5 | Over @ DraftKings + Under @ BetMGM | 0.72% | Sep 9, 7:04 PM ET |
| Arizona Diamondbacks @ Kansas City Royals · MLB | total 8.5 | Over @ DraftKings + Under @ BetMGM | 13.33% | Sep 8, 11:10 PM ET |
| Texas Rangers @ Seattle Mariners · MLB | total 7.5 | Over @ BetMGM + Under @ DraftKings | 5.85% | Sep 8, 10:54 PM ET |
Frequently asked questions
How often do BetMGM and DraftKings disagree?
In the last 30 days our scanner recorded 48 game-markets where BetMGM and DraftKings quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 48 scans. The average net edge was 4.22% and the largest 13.33%.
Which has lower vig, BetMGM or DraftKings?
DraftKings — BetMGM measures 4.96% overall and DraftKings measures 4.54% 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 DraftKings disagree on most?
MLB (48 game-markets, avg 4.22%).
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