In WTA French Open betting, spreads — commonly called game handicaps — involve one player giving or receiving a specified number of games across the match. For example, a -4.5 game spread on Iga Świątek means she must win by at least five more games than her opponent for the bet to cash. This differs from point spreads in football or basketball, where the margin is measured in points; in tennis, the unit is total games won, making each set's competitiveness critically important to the outcome.
Spread betting on clay is particularly valuable when there's a significant skill gap between opponents but the moneyline offers little return. Early-round matches at Roland Garros frequently feature elite players against qualifiers, where moneyline odds can dip below -1000 but a well-researched game spread provides far better value. Bettors should monitor clay-court form, first-serve percentages on slow surfaces, and whether a favorite tends to cruise or play down to opponents. Regarding vig, WTA spreads typically carry slightly higher margins than moneylines or basic over/under totals, as books price in the added uncertainty of game-by-game variance — making it especially worthwhile to compare lines across multiple sportsbooks before placing a wager.
Analysis updated September 20, 2026. Odds data above refreshes hourly.
Cross-Sport spreads Vig Comparison
WTA French Open spreads averages 7.48% vig across 5 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs WTA French Open |
|---|---|---|
| WTA French Open | 7.48% | — |
| ATP China Open | 6.41% | WTA French Open runs 1.07 pts higher |
| ATP Japan Open | 6.09% | WTA French Open runs 1.39 pts higher |
| WTA China Open | 6.59% | WTA French Open runs 0.89 pts higher |
| CFL | 5.11% | WTA French Open runs 2.37 pts higher |
Vig Rankings
| # | Sportsbook | Vig | Grade | Events |
|---|---|---|---|---|
| 1 | betPARX | 6.08% | C | 1 |
| 2 | Bovada | 6.98% | C | 1 |
| 3 | Bally Bet | 7.51% | D | 1 |
| 4 | Caesars | 7.96% | D | 1 |
| 5 | MyBookie.ag | 8.85% | D- | 1 |
Frequently Asked Questions
Which sportsbook has the lowest WTA French Open spreads vig?
betPARX currently has the lowest vig at 6.08%, earning a grade of C.
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.