BetMGM vs Courtside: where their odds disagree
Over the last 30 days, BetMGM and Courtside quoted the same line at prices that summed to less than 100% on 8 game-markets — a cross-book arbitrage — with an average net edge of 3.09% and a peak of 13.60%. On plain vig, Courtside is the cheaper book of the two. Last disagreement: Sep 19, 2026.
Vig: BetMGM vs Courtside
| BetMGM | Courtside | |
|---|---|---|
| Overall overround | 4.96% | 4.03% |
| Moneyline | 4.45% | 3.58% |
| Spreads | 4.65% | 3.90% |
| Totals | 5.58% | 5.49% |
| NFL | 4.39% | 3.69% |
| MLB | 4.81% | 4.38% |
| NBA | 4.60% | — |
| NHL | 4.56% | — |
| MLS | 8.73% | — |
Disagreements by sport
| Sport | Game-markets | Avg net edge | Max net edge |
|---|---|---|---|
| MLB | 8 | 3.09% | 13.60% |
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 |
|---|---|---|---|---|
| New York Yankees @ Arizona Diamondbacks · MLB | total 11.5 | Over @ Courtside + Under @ BetMGM | 5.73% | Sep 19, 12:39 AM ET |
| Atlanta Braves @ Chicago Cubs · MLB | total 7.5 | Over @ BetMGM + Under @ Courtside | 2.25% | Sep 15, 10:04 PM ET |
| Baltimore Orioles @ New York Mets · MLB | spread 1.5 | Baltimore Orioles @ BetMGM + New York Mets @ Courtside | 0.96% | Sep 14, 9:32 PM ET |
| Kansas City Royals @ Boston Red Sox · MLB | moneyline | Boston Red Sox @ BetMGM + Kansas City Royals @ Courtside | 0.36% | Sep 13, 6:04 PM ET |
| Pittsburgh Pirates @ Chicago Cubs · MLB | total 7.5 | Over @ BetMGM + Under @ Courtside | 13.60% | Sep 13, 5:18 PM ET |
| Los Angeles Angels @ Washington Nationals · MLB | total 10.5 | Over @ BetMGM + Under @ Courtside | 0.34% | Sep 13, 4:18 PM ET |
| Los Angeles Angels @ Washington Nationals · MLB | spread 1.5 | Los Angeles Angels @ BetMGM + Washington Nationals @ Courtside | 0.96% | Sep 13, 4:18 PM ET |
| Los Angeles Angels @ Washington Nationals · MLB | moneyline | Los Angeles Angels @ BetMGM + Washington Nationals @ Courtside | 0.53% | Sep 13, 2:17 PM ET |
Frequently asked questions
How often do BetMGM and Courtside disagree?
In the last 30 days our scanner recorded 8 game-markets where BetMGM and Courtside quoted the same line at prices whose implied probabilities summed to less than 100% — a cross-book arbitrage — across 8 scans. The average net edge was 3.09% and the largest 13.60%.
Which has lower vig, BetMGM or Courtside?
Courtside — BetMGM measures 4.96% overall and Courtside measures 4.03% 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 Courtside disagree on most?
MLB (8 game-markets, avg 3.09%).
← all sportsbooks · BetMGM · Courtside · what arbitrage is · dutching calculator