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 WTA French Open Odds Today

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

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

WTA French 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 French Open lines, the full analysis will become available.

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

The WTA French Open operates within tennis's clay court season, with the tournament itself held annually during the final week of May through early June at Roland Garros. Sportsbooks typically release initial French Open futures in January following the Australian Open, with odds continuously adjusted throughout the clay court swing that begins in April with events in Charleston, Stuttgart, and Madrid. The tournament's unique two-week format creates distinct betting windows, as first-round odds appear roughly ten days before main draw action begins, while outright winner markets remain active throughout the fortnight until the June championship matches.

Off-season French Open betting centers heavily on outright winner futures, with clay court specialists like Iga Swiatek and Rafael Nadal historically commanding shorter odds than their hard court rankings might suggest. Quarter-specific futures offer value for bettors targeting players' draw positioning, while "to reach final" and "to win set" props become available closer to the tournament. First-time Grand Slam winner markets particularly shine at Roland Garros, where the clay surface often produces breakthrough performances. Additionally, head-to-head season series between top players frequently include clay court specific props, with emphasis on matches during the Madrid, Rome, and French Open sequence.

Vig patterns for French Open futures typically tighten significantly during the April clay court preparation tournaments, as Madrid and Rome results dramatically shift player form assessments. Early January lines often carry higher juice as books hedge against uncertainty, but the sweet spot for value emerges in late March before clay court results begin influencing odds. Historical analysis shows the largest futures movements occur following Madrid Open results in early May, where surface-specific form becomes clear, and after first-round French Open draws are released, when bracket positioning impacts quarter and semifinal odds substantially.

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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.