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 US Open Odds Today

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

No live odds are currently available for ATP 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.

ATP US Open Odds Not Currently Available

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

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

The ATP US Open betting calendar follows a unique rhythm within the tennis season, with the tournament occurring annually during the final two weeks of August and first week of September at Flushing Meadows. Unlike traditional team sports, tennis futures markets for the US Open typically open immediately after the previous year's tournament concludes, with initial outright winner odds available by late September. The most liquid betting period begins in earnest during the clay court season in April and May, as players' hard court form from earlier in the year provides a baseline for assessment, while the key evaluation window runs through the summer hard court swing in July and August leading directly into the event.

Off-season US Open futures markets center heavily on outright tournament winner bets, with separate men's and women's championship markets offering the primary betting interest. Quarter-specific betting becomes available closer to the event, allowing bettors to wager on which player will emerge from each section of the draw. Set betting futures for potential finals matchups appear sporadically at major sportsbooks, while some operators offer novelty markets on potential first-round upset victims among top seeds. The unique single-elimination format means player-specific season win totals don't exist, but books occasionally offer props on whether certain players will reach specific rounds based on their seeding.

Vig patterns in US Open betting typically start loose during the initial post-tournament window, with margins often exceeding 110% on outright markets as books hedge against uncertainty. The sharpest value window generally occurs during the European clay season from April through June, when casual attention focuses elsewhere but informed tennis bettors can identify line discrepancies. Odds movements historically spike around three key periods: post-Wimbledon in mid-July when grass court results reshape hard court expectations, during the Montreal and Cincinnati Masters events in August as direct US Open preparation, and following the draw ceremony approximately one week before play begins, when bracket positioning creates dramatic shifts in perceived paths to the title.

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.