The WTA Charleston Open, held annually at the Credit One Charleston Open on Harbour Town's green clay courts, presents a distinctive betting landscape. As one of the few clay-court events on American soil, it forces bettors to reconsider assumptions built on hard-court form. Clay naturally produces longer rallies, more breaks of serve, and greater physical demands, which tends to elevate baseline grinders and diminish big servers. Match duration on clay is inherently less predictable, making over/under game totals and set betting markets particularly interesting. The tournament typically draws a solid but not elite field — it's a WTA 500 event — meaning the depth of outright and match markets is moderate, with liquidity concentrated on the top quarter of the draw rather than spread evenly across all rounds.
Vig on Charleston matches tends to run slightly wider than what bettors encounter at Grand Slams or WTA 1000 events. Sportsbooks price less-followed tournaments with larger margins because lower betting volume means less market pressure to sharpen lines. Early-round matches featuring lesser-known players can carry especially inflated juice, sometimes pushing combined implied probability well above 105-106%. As the tournament progresses into the quarterfinals and beyond, margins typically tighten as sharper money enters the market and books compete more aggressively on higher-profile matchups. Comparing vig across books becomes particularly valuable in the first two rounds, where the spread between the sharpest and softest pricing can be significant.
Charleston falls in early April, landing right at the start of the spring clay-court swing that builds toward Roland Garros. This timing matters for bettors because many players are transitioning from hard courts, and early-season clay form can be unreliable. Players who spent the off-season training on clay — or who recently competed in South American or European clay events — often carry an undervalued edge. Weather is another critical variable; Charleston's coastal climate brings humidity, wind, and occasional rain delays that can disrupt momentum and disproportionately affect players who struggle with interrupted match rhythms. Matchup dynamics on clay reward patience in analysis — head-to-head records on the surface carry more predictive weight than overall records, and movement quality often matters more than raw power.
Analysis updated September 27, 2026. Odds data above refreshes hourly.
Yuliia Starodubtseva @ Jessica Pegula
Best moneyline price: Jessica Pegula -350 at Bovada; Yuliia Starodubtseva +300 at theScore Bet (ESPN Bet).
| Side | Market | Best Line | Worst |
|---|---|---|---|
| Jessica Pegula | Moneyline | Bovada: -350 | -410 |
| Yuliia Starodubtseva | Moneyline | theScore Bet (ESPN Bet): +300 | +250 |
| Jessica Pegula -4.5 | Spread | LowVig.ag: -118 | -125 |
| Yuliia Starodubtseva +4.5 | Spread | LowVig.ag: -102 | -110 |
| Over 20.5 | Total | LowVig.ag: -102 | -115 |
| Under 20.5 | Total | BetRivers: -114 | -120 |
Frequently Asked Questions
What are the best WTA Charleston Open lines today?
The table below shows which sportsbook has the best available price on each side of every upcoming WTA Charleston Open event. Line shopping across multiple books can save you 1–3% per bet compared to sticking with a single sportsbook.
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.