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.

WTA Australian Open Sportsbook Vig Rankings

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

No live odds are currently available for WTA Australian 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 Australian Open Odds Not Currently Available

WTA Australian 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 Australian 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 Australian Open tennis season follows a predictable rhythm that savvy bettors can exploit. Pre-tournament futures markets typically open in late November following the WTA Finals conclusion, with the most liquid betting appearing by mid-December. The tournament itself runs during the final two weeks of January, with qualifying rounds beginning in mid-January. Unlike team sports with extended seasons, tennis betting operates in concentrated windows around each major, making the Australian Open's summer timing particularly advantageous for establishing early positions on players' form heading into the new calendar year.

Off-season Australian Open betting centers heavily on outright winner futures, with books offering odds on all top-50 ranked players by December. Quarter-specific betting becomes available closer to the draw ceremony, typically held the Friday before tournament start. Set betting markets and first-round matchup props emerge once the draw is released, while more exotic options like "tournament without Djokovic/Nadal/Federer" or nationality-based props provide alternative angles. Head-to-head season series between top players also carry through the Australian summer, as many competitors use warm-up events in Adelaide and Brisbane to prepare.

Vig patterns in Australian Open futures follow tennis's unique rhythm—sportsbooks maintain wider margins on outright winners during November and December, often exceeding 125% book percentage across all competitors. The sharpest value window typically occurs in the final week before the tournament when recreational money floods toward popular names, creating line movement that sophisticated bettors can counter. Injury withdrawals drive the most dramatic off-season odds shifts, particularly when they affect top-5 seeds, as books must rapidly redistribute win probability across remaining competitors. Late roster changes in warm-up tournaments also signal form and fitness levels that may not yet be reflected in futures pricing.

In-Season Sports

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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.