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 China Open Odds Today

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

No live odds are currently available for ATP China 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 China Open Odds Not Currently Available

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

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

The ATP China Open operates within a compressed tournament window during the Asian swing of the tennis calendar, typically held in early October as part of the ATP 500 series. Unlike traditional team sports with extended seasons, this Beijing-based tournament represents a crucial two-week period where players accumulate ranking points and prize money before the year-end ATP Finals. Preseason betting markets for the China Open typically emerge in late August following the US Open, giving bettors roughly six weeks to analyze player form and identify value opportunities before the tournament's first-round matches commence.

Off-season futures markets for the China Open focus heavily on outright winner odds, with sportsbooks offering extensive betting options on both the men's and women's draws when held concurrently. Quarter and semifinal futures provide mid-range value, while first-round upset specials become particularly popular given the tournament's reputation for early-round surprises on the outdoor hard courts. Draw-dependent markets emerge once the player field is finalized in mid-September, allowing sharp bettors to capitalize on favorable bracket positioning before casual money floods the markets closer to tournament week.

Vig patterns in China Open betting typically start wide in late August, with recreational-focused books offering margins exceeding 110% on outright markets. The sweet spot for value hunting occurs in mid-September when books have established their initial lines but before mainstream tennis coverage intensifies. Historical odds movements center around late withdrawals from top-ranked players due to fatigue from the US Open-Asian swing transition, creating dramatic line shifts when marquee names like Djokovic or Nadal announce participation changes. Weather delays and air quality concerns in Beijing also trigger significant in-tournament adjustments, making live betting particularly volatile during match play.

In-Season Sports

These sports have active odds right now:

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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.