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.

Pinnacle ATP Madrid Open Odds

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

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

ATP Madrid 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 Madrid 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 ATP Madrid Open operates within a tight window as part of the European clay court swing, typically held in late April to early May each year. This Masters 1000 event serves as crucial preparation for the French Open, with player commitments usually confirmed by mid-March when the entry list is released. Preseason futures for the Madrid Open generally appear in January alongside other Masters series events, though the most liquid betting markets emerge 4-6 weeks before the tournament when the draw is finalized and player form from previous clay court events becomes clearer.

Off-season betting opportunities for Madrid's clay court specialists center heavily on outright winner markets and player-specific props. Bettors can find value in futures on traditional clay court champions like Rafael Nadal or emerging talents who showed promise on the surface in previous seasons. Set betting markets and total games props become particularly attractive once the draw is released, as the unique playing conditions at Madrid's high altitude significantly impact match dynamics. Quarter-specific betting and "to reach final" props offer strategic value for players who historically perform well in the tournament's latter stages, while first-round upset specials can provide opportunities given the surface transition challenges many players face.

Vig patterns for the Madrid Open typically tighten significantly once the main draw is released in late April, with the sharpest lines appearing 48-72 hours before first-round matches begin. Early season futures often carry higher margins of 8-12%, dropping to 4-6% as the tournament approaches. The biggest odds movements historically occur following Monte Carlo and Barcelona results, as these preceding clay court events directly impact Madrid seeding and player confidence levels. Weather forecasts also drive substantial line movement, as Madrid's altitude and potential rain delays can dramatically alter playing conditions and favor certain playing styles over others.

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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.