In WTA tennis, spread betting — commonly referred to as game spreads or handicaps — involves giving one player a specified advantage or disadvantage in total games won across the match. For example, a -4.5 game spread on the favorite means she must win by at least five more games than her opponent for the bet to cash. This differs fundamentally from team sport spreads where the margin is measured in points; in tennis, the granularity of games creates a unique dynamic where a single break of serve can swing cover potential dramatically.
The spreads market at the Cincinnati Open becomes particularly valuable when there's a significant skill gap between opponents in early rounds, where moneyline odds on the favorite offer minimal return. Bettors should closely monitor surface form on hardcourt, head-to-head records, and how players handle the late-summer heat and humidity that defines this tournament. Fatigue is a real factor, as many competitors arrive having played in Montreal the week prior. Regarding vig, game spreads in WTA markets typically carry slightly higher juice than moneylines or over/under totals — often in the -112 to -115 range per side — making it especially important to compare pricing across books before placing a wager.
Spreads Vig Rankings
| # | Sportsbook | Vig | Grade | Events |
|---|---|---|---|---|
| 1 | Pinnacle | 3.12% | B+ | 12 |
| 2 | LowVig.ag | 4.55% | B | 12 |
| 3 | BetOnline.ag | 4.55% | B | 12 |
| 4 | BetUS | 6.78% | C | 8 |
| 5 | BetAnything | 6.80% | C | 8 |
| 6 | Bovada | 6.84% | C | 11 |
| 7 | BetRivers | 7.01% | D | 12 |
| 8 | Bally Bet | 7.07% | D | 12 |
| 9 | betPARX | 7.07% | D | 12 |
| 10 | Caesars | 8.81% | D- | 12 |
| 11 | ReBet | 8.97% | D- | 12 |
Upcoming Spreads Lines
| Matchup | Time | ReBet | Bovada | BetRivers | Bally Bet | betPARX |
|---|---|---|---|---|---|---|
| Madison Keys @ Katerina Siniakova | Aug 18, 3:00 PM | -4.5 (-125) | -4.5 (-130) | -4.5 (-127) | -3.5 (-190) | -3.5 (-190) |
| Mirra Andreeva @ Janice Tjen | Aug 18, 4:00 PM | -5.5 (-125) | -5.5 (-120) | -5.5 (-132) | -4.5 (-220) | -4.5 (-220) |
| Elina Svitolina @ Xiyu Wang | Aug 18, 6:00 PM | +4.5 (-118) | +4.5 (-110) | +4.5 (-125) | +3.5 (+128) | +3.5 (+128) |
| Ann Li @ Coco Gauff | Aug 18, 7:00 PM | -5.5 (-125) | -5.5 (-120) | -5.5 (-118) | -4.5 (-200) | -4.5 (-200) |
| Sloane Stephens @ Marta Kostyuk | Aug 18, 7:00 PM | +6.5 (-154) | +6 (-130) | +5.5 (+104) | +5.5 (+104) | +5.5 (+104) |
Frequently Asked Questions
What is a point spread bet?
A point spread bet levels the playing field by giving the underdog a head start. If the spread is Patriots -7, they must win by more than 7 points for a spread bet to pay. Spreads are the most popular market in football and basketball, which means they attract the most volume and typically have the lowest vig.
Why do spreads usually have lower vig than moneylines?
Spreads attract the highest betting volume because they create a roughly 50/50 proposition regardless of team quality. This balanced action means sportsbooks don't need wide margins to manage risk, resulting in tighter vig — often the best value available.
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.
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.