NBA Summer League presents one of the most volatile and inefficient betting markets in professional basketball. Held primarily in Las Vegas each July, with occasional earlier showcases in Salt Lake City and Sacramento, the league features rosters stacked with rookies, second-year players fighting for roster spots, and undrafted free agents auditioning for two-way contracts. The result is wildly inconsistent play — scoring runs can be erratic, turnovers are elevated, and team chemistry is virtually nonexistent. Games are played in shorter formats (sometimes 40 minutes with modified quarter lengths), and blowouts are common as talent disparities between rosters can be massive. Totals and spreads behave differently than in the regular NBA season, making historical modeling far less reliable.
Vig on Summer League lines tends to run wider than standard NBA regular-season markets, and for good reason. Sportsbooks face significantly less liquidity, sharper information asymmetry, and smaller handle volumes, all of which incentivize them to build in extra margin. While a competitive NBA regular-season spread might carry -108/-112 or tighter juice, Summer League lines frequently sit at -110/-110 with inflated spreads, or show wider gaps on moneylines and totals. Books are also slower to adjust lines because injury and roster information is murkier — a coach might rest a lottery pick for the second half with no advance notice, completely changing the complexion of a game.
The sharpest edges in Summer League betting tend to appear in the first few days of play, before books can calibrate rosters and rotations. Early-tournament lines are often set with limited information, and bettors who closely track preseason minicamp reports, rookie scouting profiles, and coaching staff tendencies can find genuine value. As the tournament progresses toward the championship game, lines tighten modestly as performance data accumulates. Key factors affecting odds include sudden DNPs for top prospects being "shut down," minute restrictions, and the general absence of meaningful home-court advantage since nearly all games are played at neutral sites in Las Vegas.
Cross-Sport Vig Comparison
NBA Summer League averages 5.63% vig across 17 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs NBA Summer League |
|---|---|---|
| NBA Summer League | 5.63% | — |
| CFL | 5.15% | 0.48% higher |
| NCAAF | 4.84% | 0.79% higher |
| NFL | 4.76% | 0.87% higher |
| NFL Preseason | 4.78% | 0.85% higher |
Vig Rankings
| # | Sportsbook | Avg Vig | Grade | ML | Spreads | Totals | Events |
|---|---|---|---|---|---|---|---|
| 1 | LowVig.ag | 3.55% | B+ | 3.43% | 3.84% | 3.39% | 2 |
| 2 | BetOnline.ag | 4.28% | B | 3.43% | 4.76% | 4.65% | 2 |
| 3 | BetUS | 4.36% | B | 3.57% | 4.76% | 4.76% | 2 |
| 4 | DraftKings | 4.79% | B | 3.60% | 5.43% | 5.35% | 3 |
| 5 | FanDuel | 4.94% | B | 4.18% | 5.30% | 5.35% | 3 |
| 6 | ReBet | 4.94% | B | 5.03% | 5.02% | 4.76% | 2 |
| 7 | Fanatics | 4.96% | B | 3.83% | 5.41% | 5.25% | 3 |
| 8 | Bovada | 5.04% | C+ | 4.05% | 5.35% | 5.40% | 3 |
| 9 | BetMGM | 5.19% | C+ | 4.70% | 5.35% | 5.53% | 3 |
| 10 | Caesars | 5.47% | C+ | 4.01% | 6.20% | 6.20% | 3 |
| 11 | Pinnacle | 5.51% | C+ | 5.10% | 5.76% | 5.52% | 3 |
| 12 | Hard Rock Bet | 5.57% | C+ | 4.94% | 5.75% | 5.82% | 3 |
| 13 | MyBookie.ag | 6.17% | C | 7.00% | 5.90% | 5.90% | 3 |
| 14 | BetAnything | 6.98% | C | — | 6.98% | 6.98% | 2 |
| 15 | theScore Bet (ESPN Bet) | 7.31% | D | 7.37% | 7.28% | 7.30% | 3 |
| 16 | BetRivers | 8.17% | D- | 6.59% | 8.05% | 9.35% | 3 |
| 17 | Fliff | 8.51% | D- | 8.02% | 8.66% | 8.69% | 3 |
Frequently Asked Questions
Which sportsbook has the lowest NBA Summer League vig?
LowVig.ag currently has the lowest vig at 3.55%, earning a grade of B+.
What is vig (vigorish) in sports betting?
Vig — short for vigorish, also called juice or overround — is the margin a sportsbook builds into its odds. It's the difference between the true probability of an outcome and what the odds imply. Lower vig means you keep more of your winnings on every bet. For example, a standard -110/-110 line has about 4.76% vig.
How often is this data updated?
We pull fresh odds from The Odds API three times per day — at 6:00 AM, 2:00 PM, and 10:00 PM UTC. Each snapshot captures the latest lines from every sportsbook that has posted odds. The timestamp at the top of the page shows the most recent refresh.
How is the vig grade calculated?
Each sportsbook is graded on a letter scale based on average vig: A+ (under 2%) is exceptional, A (2–3%) is excellent, B+ (3–4%) is above average, B (4–5%) is the industry standard, C (5–6%) is below average, and D (above 6%) indicates high-juice markets.
Why does lower vig matter for bettors?
Lower vig directly impacts your long-term returns. A bettor placing $1,000 per week at a book with 4% vig loses roughly $40/week to the house edge. At 2% vig, that drops to $20/week — a $1,040 difference over a year. For serious bettors, shopping for lower vig is one of the most reliable ways to improve profitability.
What sportsbooks do you track?
We track both regulated US sportsbooks (DraftKings, FanDuel, BetMGM, Caesars) and offshore books (Bovada, BetOnline, MyBookie, BetUS, LowVig.ag, BetAnySports). Data comes from The Odds API, which aggregates real-time lines from licensed sources.
How We Calculate These Numbers
- Data Source
- All odds on this page come from The Odds API, which aggregates real-time lines from licensed US and offshore sportsbooks. We track moneyline, spread, and totals markets across every sport with active betting lines.
- Update Frequency
- We pull a fresh snapshot of every tracked market three times per day — at 6:00 AM, 2:00 PM, and 10:00 PM UTC. Each snapshot captures the latest lines from every sportsbook that has posted odds for a given event. The timestamp at the top of each page tells you exactly when the data was last refreshed.
- Vig Calculation
- Vig (short for vigorish, also called juice or overround) measures the margin a sportsbook builds into its odds. We calculate it by converting the odds on each side of a market to implied probabilities, summing those probabilities, and subtracting 100%. For example, a market priced at -110/-110 implies 52.38% on each side — a total of 104.76%, meaning a vig of 4.76%. Lower vig means better value for bettors because you keep more of your winnings.
- Per-Market Breakdown
- We compute vig separately for each market type: moneyline (h2h), point spreads, and totals (over/under). The "average vig" shown for each sportsbook is the mean across all market types weighted by the number of events sampled in each market.
- Grading Scale
- Every sportsbook receives a letter grade based on its average vig: A+ (under 2%) is exchange-level pricing. A (2–3%) is very competitive. B+ (3–4%) is above average. B (4–5%) is the industry standard — a -110/-110 line is 4.76%. C+ (5–6%) is slightly below average. C (6–7%) is below average. D (7–8%) is high vig. D− (8–10%) is very high vig. F (10%+) is predatory pricing. See the full Vig Index Methodology for formulas, worked examples, and known limitations.
- Trend Tracking
- We store daily snapshots for 30 days, allowing us to show 24-hour and 7-day vig trends. A downward trend (improving) means sportsbooks are tightening their lines — often in response to increased competition or higher betting volume as a season heats up.