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 Canadian Open Odds Today

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

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

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

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

The ATP Canadian Open operates on a unique annual timeline within the tennis calendar, typically held in early August as part of the ATP Masters 1000 series. The tournament alternates locations between Toronto and Montreal each year, with the men's event running for approximately one week in the first or second week of August. Unlike team sports with extended seasons, tennis futures markets for the Canadian Open generally open 2-3 months prior to the tournament, with initial odds appearing in late May or early June. The tournament serves as crucial preparation for the US Open, creating distinct betting dynamics as players balance performance with injury risk management.

Off-season betting opportunities for the Canadian Open center heavily on outright winner markets, with books offering futures on both the men's singles champion and various prop bets. Popular markets include first-round exit props for top seeds, quarter-final qualifier bets, and head-to-head tournament performance comparisons between ranked players. Unlike other sports, there are no draft considerations, but the ATP rankings system creates dynamic odds as players accumulate or lose ranking points throughout the clay and grass court seasons leading up to the hard court swing. Draw-specific props emerge once the tournament bracket is released, typically one week before play begins.

Vig patterns for Canadian Open betting typically show their loosest margins during the initial futures release in late spring, when books have less certainty about player form and fitness coming off the clay court season. The most significant odds movements occur following Wimbledon results in early July, as hard court specialists often see their odds shorten while grass court specialists may lengthen. Injury withdrawals create the most dramatic line movement, particularly when top-five players withdraw within 48 hours of the draw ceremony. Surface transition from grass to hard courts historically produces the largest disparities between European and North American sportsbook assessments of player value.

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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.