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 China Open Moneyline Odds Today

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

No live odds are currently available for WTA 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.

WTA China Open Odds Not Currently Available

WTA 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 WTA China 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 WTA China Open operates within a compressed tournament window that typically runs from late September to early October, positioned strategically in the WTA's Asian swing following the US Open. Unlike season-long sports, this WTA 1000 event generates betting interest primarily through pre-tournament futures that emerge roughly 4-6 weeks before the event begins, with initial outright winner markets appearing in late August. The tournament's unique timing means it often serves as crucial preparation for the WTA Finals, creating additional betting angles around year-end rankings and qualification scenarios that don't exist for other tour events.

Futures betting for the China Open centers heavily on outright winner markets, with sportsbooks typically offering enhanced odds on local favorites and defending champions. Quarter-specific betting becomes particularly valuable given the tournament's strong field depth, while head-to-head matchups between top-10 players draw significant action. The event's hard court surface and Beijing's specific playing conditions create opportunities for surface-specialist prop bets, especially for players with strong Asian swing records. Set betting and games handicaps tend to offer more value than traditional moneylines due to the tournament's reputation for producing tight matches between elite players.

Vig patterns for the China Open typically start loose in early September when books post initial futures, offering the best value window for backing longshot winners before the field crystallizes. Margins tighten significantly once main draw entries are confirmed, usually 10 days before the tournament begins. The biggest line movements historically stem from late withdrawals due to injury or fatigue from the US Open-to-Asia travel schedule, with books often scrambling to adjust markets when top seeds pull out. Weather delays and air quality concerns in Beijing have also created mid-tournament betting opportunities, as books struggle to price matches that may be moved indoors or rescheduled.

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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.