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.

Best ATP Australian Open Odds Today

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

No live odds are currently available for ATP 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.

ATP Australian Open Odds Not Currently Available

ATP 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 ATP Australian Open lines, the full analysis will become available.

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

The ATP Australian Open operates within tennis's unique calendar structure, with the tournament held annually in mid-to-late January in Melbourne. Unlike traditional team sports, tennis futures markets for the Australian Open typically open immediately after the previous year's tournament concludes, running through the entire calendar year. Preseason preparation occurs during the December-January period when players compete in warm-up events like the Adelaide International and United Cup, providing crucial form indicators before the major championship. Outright winner markets, quarter-final betting, and set handicap futures become available roughly six months prior to the tournament, with the most liquid betting occurring in the final two months leading up to the event.

Off-season betting opportunities center heavily on outright tournament winner futures, with books offering odds on all seeded players plus emerging talents. Popular futures include first-time Grand Slam winner props, nationality-based betting (such as which country will have the most quarterfinalists), and draw-specific markets once seedings are released in early January. Unlike team sports, there are no draft or free agency considerations, but coaching changes and training base relocations can significantly impact player odds. The WTA and ATP ranking updates throughout the year directly influence seeding predictions and create betting value on players moving up or down the rankings hierarchy.

Vig patterns in Australian Open markets typically show the loosest margins during the initial futures release in February-March following the previous tournament, when books price in maximum uncertainty over player form and fitness. Margins tighten considerably once the ATP Finals conclude in November, as the tennis season winds down and player hierarchies become clearer. The highest-value betting window often occurs during the clay and grass court seasons (May-July) when hard-court specialists may see their Australian Open odds drift despite strong overall seasons. Major odds movements historically stem from injury announcements during the off-season, particularly for top-10 players, coaching changes involving former Grand Slam champions, and breakthrough performances at Masters 1000 events that signal emerging contenders for Melbourne.

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.