The WTA Italian Open, held annually at the Foro Italico in Rome, occupies a critical slot on the tennis calendar as one of the premier clay-court events leading into Roland Garros. For bettors, clay-court tennis presents distinct dynamics: longer rallies, fewer aces, and more predictable outcomes favoring baseline specialists with superior fitness and topspin-heavy games. This translates into a betting landscape where surface specialists and form players tend to hold their value more reliably than on faster surfaces. Market depth at Rome is strong — sportsbooks offer extensive match winner, set betting, game handicap, and over/under totals lines — though live betting is where the real opportunities emerge, as momentum swings on clay tend to be more gradual and readable than on hard courts or grass.
Vig on WTA Italian Open matches varies meaningfully depending on the round and profile of the match. Early-round contests featuring lower-ranked qualifiers or lesser-known players tend to carry wider margins, sometimes exceeding 6-8%, as bookmakers price in greater uncertainty and lower betting volume. By the quarterfinals and beyond, margins typically tighten to the 3-5% range as sharper money enters the market and books compete more aggressively for action on marquee matchups. Comparing vig across sportsbooks becomes especially valuable in this tournament, where the spread between the tightest and loosest lines on the same match can represent meaningful edge over a full week of wagering.
The tournament typically runs in mid-May, and odds tend to be most competitive once the draw is set and early-round results provide form context. Key factors that shape Rome's betting lines include the outdoor clay-court conditions — wind and occasional rain delays can disrupt rhythm-dependent players — and the physical toll of the spring clay swing, where fatigue and nagging injuries from Madrid and earlier events significantly affect performance. Head-to-head records on clay carry more predictive weight here than general tour records, and bettors should pay close attention to how players have performed in the preceding weeks at Madrid and Stuttgart, as recent clay form is one of the strongest indicators of success at the Foro Italico.
Cross-Sport Vig Comparison
WTA Italian Open averages 5.45% vig across 18 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs WTA Italian Open |
|---|---|---|
| WTA Italian Open | 5.45% | — |
| CFL | 5.15% | 0.30% higher |
| NCAAF | 4.84% | 0.61% higher |
| NFL | 4.76% | 0.69% higher |
| NFL Preseason | 4.78% | 0.67% higher |
Vig Rankings
| # | Sportsbook | Avg Vig | Grade | ML | Spreads | Totals | Events |
|---|---|---|---|---|---|---|---|
| 1 | Pinnacle | 2.76% | A | 2.47% | 2.89% | 2.91% | 1 |
| 2 | BetOnline.ag | 4.00% | B | 3.89% | 4.07% | 4.05% | 1 |
| 3 | LowVig.ag | 4.00% | B | 3.89% | 4.07% | 4.05% | 1 |
| 4 | BetMGM | 4.44% | B | 4.44% | — | — | 1 |
| 5 | FanDuel | 4.72% | B | 4.72% | — | — | 1 |
| 6 | DraftKings | 4.76% | B | 4.76% | — | — | 1 |
| 7 | theScore Bet (ESPN Bet) | 5.02% | C+ | 5.02% | — | — | 1 |
| 8 | Fanatics | 5.23% | C+ | 5.23% | — | — | 1 |
| 9 | Hard Rock Bet | 5.23% | C+ | 5.23% | — | — | 1 |
| 10 | 888sport | 5.45% | C+ | 5.45% | — | — | 1 |
| 11 | BetRivers | 5.78% | C+ | 5.53% | 6.24% | 5.56% | 1 |
| 12 | betPARX | 5.86% | C+ | 5.53% | 5.35% | 6.69% | 1 |
| 13 | Bally Bet | 5.86% | C+ | 5.53% | 5.35% | 6.69% | 1 |
| 14 | BetAnything | 6.10% | C | 5.27% | — | 6.93% | 1 |
| 15 | BetUS | 6.45% | C | 5.45% | 6.93% | 6.98% | 1 |
| 16 | Fliff | 6.99% | C | 6.99% | — | — | 1 |
| 17 | ReBet | 7.37% | D | 6.03% | 8.26% | 7.82% | 1 |
| 18 | Caesars | 8.13% | D- | 6.44% | 9.04% | 8.90% | 1 |
Frequently Asked Questions
Which sportsbook has the lowest WTA Italian Open vig?
Pinnacle currently has the lowest vig at 2.76%, earning a grade of A.
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.