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.

Caesars WTA Canadian Open Odds

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

No live odds are currently available for WTA 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.

WTA Canadian Open Odds Not Currently Available

WTA 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 WTA Canadian 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 Canadian Open, officially known as the National Bank Open presented by Rogers, occupies a crucial spot in the tennis calendar as part of the WTA 1000 series. Held annually in mid-August, typically during the second week of the month, this tournament serves as a critical tune-up event before the US Open. The tournament alternates between Toronto and Montreal, with 2024 marking Toronto's hosting year. Sportsbooks typically release futures odds for major WTA events in January, but Canadian Open-specific betting markets usually appear 4-6 weeks before the tournament begins, around early July when the draw and wild card announcements are finalized.

Off-season betting opportunities for the Canadian Open center heavily on outright winner markets and quarter-specific futures. Unlike season-long tours, tennis betting focuses on tournament-specific props including first-round upset specials, set betting markets for featured matchups, and withdrawal props given the tournament's proximity to the US Open. The unique hard court surface conditions in Toronto and Montreal create distinct playing characteristics that sharpen the value in surface-specialist futures. Bettors can also find value in nationality-based props, particularly for Canadian wild card recipients like Bianca Andreescu or Leylah Fernandez, whose odds fluctuate dramatically based on form entering the summer hard court swing.

Vig patterns for the Canadian Open typically tighten significantly once the main draw is released, usually seven days before play begins. Early-season futures often carry wider margins of 8-12%, but these compress to 4-6% once player availability is confirmed. The tournament's positioning creates unique volatility windows—odds can shift dramatically based on Wimbledon results and subsequent withdrawal announcements, as players manage their schedules before the final Grand Slam. Weather delays, common in both Toronto and Montreal venues, historically create live betting opportunities with expanded vig as books adjust to scheduling uncertainties that can dramatically alter player rest periods between 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.