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.

Bovada WTA Italian Open Odds

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

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

WTA Italian 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 Italian 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 Italian Open occupies a crucial position in the WTA calendar, typically held in mid-May as the final major clay court preparation before Roland Garros. The tournament runs for one week, usually from the second or third Monday in May, making it the penultimate Masters 1000-level event before the French Open. Unlike team sports, tennis futures markets for the Italian Open generally open 4-6 weeks before the tournament, around early to mid-April, when the clay court season begins in earnest. The tight window between clay court events means sportsbooks often wait for Charleston and Stuttgart results before posting comprehensive Italian Open odds.

Off-season betting opportunities for the Italian Open center heavily on outright winner markets and player-specific props rather than traditional futures. Sportsbooks typically offer tournament winner odds, finalist markets, and head-to-head matchups for potential early-round clashes between seeded players. Set betting becomes particularly relevant on clay, with over/under total sets markets popular given the surface's tendency to produce longer matches. Quarter-specific betting and "to reach semifinals" props gain traction due to the draw's structure, while live betting during the event focuses on game spreads and momentum shifts that clay courts amplify.

Vig patterns for the Italian Open tend to be tightest immediately after the draw release, typically the weekend before play begins, when recreational money floods outright winner markets. Books often shade lines toward marquee names like previous champions, creating value opportunities on emerging clay court specialists who haven't yet gained widespread recognition. The biggest odds movements historically stem from early clay season results at Charleston and Madrid, late injury withdrawals that reshape the draw, and weather-related scheduling changes that can compress match schedules. Surface-specific form often overrides rankings-based odds, particularly when hard court specialists struggle in their clay debut matches.

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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.