The WTA Canadian Open, part of the prestigious WTA 1000 tier, presents a compelling betting market each August as it serves as a critical hardcourt tune-up for the US Open. What makes tennis betting distinct — and this tournament in particular — is the individual nature of the sport: there are no team dynamics to mask a player's true form. Bettors must evaluate recent hardcourt results, fatigue from the summer swing, and surface transition for players coming off clay or grass seasons. Market depth is solid for a WTA 1000 event, with most major sportsbooks offering match winners, set betting, game totals, and increasingly granular live betting options. However, the WTA tour's well-documented parity — where upsets are significantly more frequent than on the ATP side — creates both opportunity and risk for sharp bettors who can identify value in underdog lines.
Vig on WTA Canadian Open matches tends to vary meaningfully by round and profile of the match. Early-round contests featuring lower-ranked players or qualifiers often carry wider margins, sometimes exceeding 6-8%, as books price in uncertainty and expect lower handle. Marquee quarterfinal and semifinal matchups between top-20 players typically see margins tighten to the 3-5% range as competition among sportsbooks intensifies and sharper money enters the market. Comparing vig across books becomes especially valuable in the later rounds, where even small margin differences can meaningfully impact long-term profitability.
Several key factors drive line movement at this event. The tournament alternates between Montreal and Toronto annually, and outdoor hardcourt conditions — including humidity, heat, and occasional rain delays — can materially affect player performance, particularly for athletes prone to fitness issues during grueling summer schedules. The timing in mid-August means fatigue and minor injuries accumulated through the North American hardcourt swing are significant variables. Bettors should closely monitor withdrawal lists and late substitutions, as these often create soft lines on replacement players. Additionally, the draw structure matters: a WTA 1000 event features 64 players with first-round byes for top seeds, meaning top players enter fresher but may face match-sharp opponents in their openers.
Analysis updated September 6, 2026. Odds data above refreshes hourly.
Cross-Sport Vig Comparison
WTA Canadian Open averages 5.50% vig across 19 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs WTA Canadian Open |
|---|---|---|
| WTA Canadian Open | 5.50% | — |
| ATP China Open | 5.70% | WTA Canadian Open runs 0.20 pts lower |
| ATP Japan Open | 5.58% | WTA Canadian Open runs 0.08 pts lower |
| WTA China Open | 5.81% | WTA Canadian Open runs 0.31 pts lower |
| CFL | 5.07% | WTA Canadian Open runs 0.43 pts higher |
Vig Rankings
| # | Sportsbook | Avg Vig | Grade | ML | Spreads | Totals | Events |
|---|---|---|---|---|---|---|---|
| 1 | Pinnacle | 3.73% | B+ | 2.33% | 4.51% | 4.34% | 1 |
| 2 | BetMGM | 3.96% | B+ | 3.96% | — | — | 1 |
| 3 | LowVig.ag | 4.16% | B | 3.69% | 4.74% | 4.05% | 1 |
| 4 | BetOnline.ag | 4.17% | B | 3.72% | 4.74% | 4.05% | 1 |
| 5 | Hard Rock Bet | 4.44% | B | 4.44% | — | — | 1 |
| 6 | FanDuel | 4.80% | B | 4.80% | — | — | 1 |
| 7 | theScore Bet (ESPN Bet) | 4.84% | B | 4.84% | — | — | 1 |
| 8 | DraftKings | 5.02% | C+ | 5.02% | — | — | 1 |
| 9 | Bovada | 5.56% | C+ | 2.98% | 6.93% | 6.78% | 1 |
| 10 | 888sport | 5.60% | C+ | 5.60% | — | — | 1 |
| 11 | betPARX | 5.75% | C+ | 4.44% | 6.41% | 6.41% | 1 |
| 12 | Bally Bet | 5.75% | C+ | 4.44% | 6.41% | 6.41% | 1 |
| 13 | BetRivers | 5.89% | C+ | 4.44% | 6.41% | 6.81% | 1 |
| 14 | Fanatics | 5.95% | C+ | 5.95% | — | — | 1 |
| 15 | BetAnything | 6.36% | C | 5.95% | — | 6.78% | 1 |
| 16 | BetUS | 6.52% | C | 5.70% | 6.93% | 6.93% | 1 |
| 17 | ReBet | 7.02% | D | 5.07% | 8.26% | 7.74% | 1 |
| 18 | Fliff | 7.11% | D | 7.11% | — | — | 1 |
| 19 | Caesars | 7.88% | D | 6.23% | 9.09% | 8.33% | 1 |
Frequently Asked Questions
Which sportsbook has the lowest WTA Canadian Open vig?
Pinnacle currently has the lowest vig at 3.73%, earning a grade of B+.
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 every hour, on the hour (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 average vig: A+ (under 2%) is exchange-level pricing, A (2–3%) very competitive, B+ (3–4%) above average, B (4–5%) the industry standard, C+ (5–6%) slightly below average, C (6–7%) below average, D (7–8%) high vig, D− (8–10%) very high, F (10%+) predatory.
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, BetAnything). Data comes from The Odds API, which aggregates real-time lines from licensed sources.
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 every hour, on the hour (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.