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.

Best ATP Cincinnati Open Odds Today

Q: Can I still compare sportsbooks for ATP Cincinnati Open?

No live odds are currently available for ATP Cincinnati Open. In the meantime, check out our odds comparison page for other available options, or visit our overall Vig Index for cross-sport rankings.

ATP Cincinnati Open Odds Not Currently Available

ATP Cincinnati Open does not currently have odds in our data feed. When odds for events are available at sportsbooks they will be listed here. This page updates 3× daily from The Odds API — when sportsbooks begin posting ATP Cincinnati Open lines, the full analysis will become available.

In the meantime, check out our odds comparison page for other available options.

The ATP Cincinnati Masters, officially known as the Cincinnati Open, occupies a crucial two-week window in mid-August each year, typically running from the second Monday through the third Sunday of the month. This ATP Masters 1000 event serves as the penultimate major hard court preparation tournament before the US Open, making it a pivotal swing tournament in the North American hard court season. Preseason outright winner odds for Cincinnati typically appear in late May or early June alongside other summer hard court events, with initial lines heavily influenced by clay court form from Roland Garros and early grass court results.

Cincinnati futures betting centers primarily on tournament outright winner markets, with sportsbooks offering extensive player props including first-round exits, semifinal qualifiers, and head-to-head matchups between seeded players. The tournament's unique position as a Masters 1000 event creates compelling set betting opportunities, particularly for players transitioning from clay or grass surfaces to hard courts. Books also offer specialized props around defending champion performance, wildcard recipient advancement, and qualifying tournament graduates reaching specific rounds. The event's proximity to the US Open generates significant cross-tournament betting interest, with Cincinnati results heavily influencing US Open futures adjustments.

Vig patterns for Cincinnati typically tighten considerably as the tournament approaches, with the best value window occurring during the initial line release in late spring when books rely heavily on ranking-based algorithms rather than surface-specific form. The biggest odds movements historically stem from late-season injury reports, particularly to top-10 players managing workloads before the US Open, and surprise early exits in preceding tournaments like Montreal or Toronto. Surface transition performances from grass court specialists or clay court grinders often create profitable middle opportunities as books adjust their models throughout the summer hard court swing.

In-Season Sports

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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.