In tennis, spread betting on the ATP Madrid Open revolves around game handicaps — a bookmaker might set Jannik Sinner at -4.5 games against a lower-ranked opponent, meaning he'd need to win by at least five games across all sets for the bet to cash. This differs fundamentally from team sport spreads; in tennis, the margin is measured in games (or sometimes sets), and the unique scoring structure means momentum swings can dramatically affect whether a handicap covers. The clay-court surface in Madrid tends to produce longer rallies and more service breaks than hard-court events, which often leads to tighter match scorelines and makes game spreads particularly interesting to analyze.
The spread market becomes most valuable when there's a mismatch in surface form rather than just ranking. A clay-court specialist ranked outside the top 30 may cover a spread against a higher-ranked player who struggles on dirt — bettors should scrutinize recent clay results and Madrid-specific performance history. Altitude in Madrid also plays a factor, as the ball flies faster at elevation, occasionally benefiting big servers in ways the spread doesn't fully account for. Vig on tennis game spreads typically runs slightly higher than moneyline markets, often sitting in the 5-7% range compared to 3-5% on head-to-head lines, making it worth comparing across books to capture the sharpest pricing available.
Cross-Sport spreads Vig Comparison
ATP Madrid Open spreads averages 5.60% vig across 9 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs ATP Madrid Open |
|---|---|---|
| ATP Madrid Open | 5.60% | — |
| CFL | 5.18% | 0.43% higher |
| NCAAF | 4.69% | 0.91% higher |
| NFL | 4.77% | 0.84% higher |
| NFL Preseason | 4.37% | 1.23% higher |
Vig Rankings
| # | Sportsbook | Vig | Grade | Events |
|---|---|---|---|---|
| 1 | Pinnacle | 2.83% | A | 1 |
| 2 | LowVig.ag | 3.63% | B+ | 1 |
| 3 | BetOnline.ag | 3.63% | B+ | 1 |
| 4 | BetRivers | 5.88% | C+ | 1 |
| 5 | betPARX | 6.35% | C | 1 |
| 6 | Bally Bet | 6.35% | C | 1 |
| 7 | BetAnything | 6.78% | C | 1 |
| 8 | BetUS | 6.93% | C | 1 |
| 9 | Caesars | 8.05% | D- | 1 |
Frequently Asked Questions
Which sportsbook has the lowest ATP Madrid Open spreads vig?
Pinnacle currently has the lowest vig at 2.83%, 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.