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.

BetAnything WTA US Open Odds

Q: Can I still compare sportsbooks for WTA US Open?

No live odds are currently available for WTA US Open. In the meantime, check out our odds comparison page for other available options, or visit our overall Vig Index for cross-sport rankings.

WTA US Open Odds Not Currently Available

WTA US Open does not currently have odds in our data feed. When odds for events are available at sportsbooks they will be listed here. This page updates 3× daily from The Odds API — when sportsbooks begin posting WTA US Open lines, the full analysis will become available.

In the meantime, check out our odds comparison page for other available options.

Not sure which sportsbook is right for you? Try the Sportsbook Selector — answer four questions and get a personalized recommendation backed by live vig data.

The US Open occurs during a compressed two-week window in late August through early September, marking the climactic end of the North American hard court swing. Unlike team sports with extended seasons, tennis betting operates on a tournament-by-tournament basis, with US Open futures markets typically opening in January following the Australian Open. The most liquid betting window emerges in June after the French Open concludes, as players transition to hard courts and early summer tournaments provide form indicators. Preseason odds for the US Open essentially span from January through August, with significant line movements occurring after Wimbledon in July when players' hard court preparations begin in earnest.

Off-season US Open betting centers heavily on outright winner futures, with separate markets for men's and women's champions offering the primary wagering vehicle. Draw-based prop bets become available once the 128-player fields are announced in late August, including first-round upset specials and section betting where bettors can wager on which quarter of the draw produces the champion. Head-to-head matchups for potential finals pairings also gain traction during the summer months, while set betting and exact score props remain limited until the actual tournament fortnight. Unlike leagues with drafts or free agency, tennis futures focus purely on player form, ranking trajectories, and historical hard court performance.

Sportsbook margins on US Open futures tend to be most favorable during the January-March window when recreational interest remains low following the Australian Open. Vig typically tightens considerably from July onward as casual betting volume increases and books become more confident in their assessments. The biggest odds movements historically stem from injury withdrawals in the weeks leading up to the tournament, with stars like Nadal or Djokovic's participation status capable of shifting the entire futures board by 10-15%. Surface transitions also drive significant line movement, as clay court specialists see their US Open odds lengthen after strong French Open showings, while hard court specialists gain value during the European clay season despite poor recent form.

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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.