Best Price Right Now
Best moneyline: Sofia Costoulas +134 at Pinnacle (runner-up +131 at DraftKings); Tatiana Prozorova -154 at Pinnacle (runner-up -155 at Bovada).
Spread: Tatiana Prozorova -2.5 (consensus). Best price: Sofia Costoulas +2.5 (-105) at Pinnacle (runner-up -110 at Bovada); Tatiana Prozorova -2.5 (-111) at Pinnacle (runner-up -117 at BetRivers).
Total (over/under): 21.5 (consensus). Best price: Over 21.5 (-109) at Pinnacle (runner-up -115 at Bovada); Under 21.5 (-106) at ReBet (runner-up -107 at Pinnacle).
Compared across 11 sportsbooks as of September 20, 2026 at 7:00 PM UTC. The best book often differs by market and by side — the full board is below.
Line Movement
Since Sep 20, 12 PM ET, the moneyline has moved toward Tatiana Prozorova (Sofia Costoulas price improved from +127 to +134).
| Market | Tracking opened (Sep 20, 12 PM ET) | Now |
|---|---|---|
| Moneyline (best available) | Sofia Costoulas +127 / Tatiana Prozorova -150 | Sofia Costoulas +134 / Tatiana Prozorova -154 |
| Spread (Tatiana Prozorova, consensus) | -2.5 | -2.5 |
| Total (consensus) | 21.5 | 21.5 |
Full Odds Board
| Sportsbook | Sofia Costoulas | Tatiana Prozorova | Spread (Tatiana Prozorova) | Total | O / U |
|---|---|---|---|---|---|
| Bovada | +130 | -155 | -2.5 (-120) | 21.5 | -115 / -115 |
| 888sport | +130 | -163 | — | — | — |
| Bally Bet | +125 | -157 | -1.5 (-136) | 21.5 | -125 / -109 |
| betPARX | +125 | -157 | -1.5 (-136) | 21.5 | -125 / -109 |
| DraftKings | +131 | -160 | — | — | — |
| Fanatics | +130 | -160 | — | — | — |
| BetMGM | +130 | -165 | — | — | — |
| BetRivers | +125 | -157 | -2.5 (-117) | 21.5 | -125 / -109 |
| Hard Rock Bet | +125 | -155 | — | — | — |
| ReBet | +116 | -175 | -2.5 (-118) | 21.5 | -141 / -106 |
| Pinnacle | +134 | -154 | -2.5 (-111) | 21.5 | -109 / -107 |
Pricing Context: WTA Singapore Open Vig
Lowest-vig sportsbooks for WTA Singapore Open right now: Pinnacle (B+, 3.66% avg vig), BetOnline.ag (B, 4.40% avg vig), FanDuel (B, 4.44% avg vig). Lower vig means the book keeps less of every dollar wagered — the best single-game price and the best long-run pricing are not always the same book. Pinnacle, which holds a best price on this game, grades B+ on WTA Singapore Open vig overall.
Frequently Asked Questions
Which sportsbook has the best odds for Sofia Costoulas vs Tatiana Prozorova?
Best available moneyline right now: Sofia Costoulas +134 at Pinnacle (runner-up +131 at DraftKings); Tatiana Prozorova -154 at Pinnacle (runner-up -155 at Bovada). Prices refresh hourly — the full board below shows every tracked sportsbook.
What is the spread for Sofia Costoulas vs Tatiana Prozorova?
The consensus spread is Tatiana Prozorova -2.5. Best price at that number: Sofia Costoulas +2.5 (-105) at Pinnacle (runner-up -110 at Bovada); Tatiana Prozorova -2.5 (-111) at Pinnacle (runner-up -117 at BetRivers). Some sportsbooks deal a different number — the full board below lists every book's spread.
What is the over/under for Sofia Costoulas vs Tatiana Prozorova?
The consensus total is 21.5. Best price at that number: Over 21.5 (-109) at Pinnacle (runner-up -115 at Bovada); Under 21.5 (-106) at ReBet (runner-up -107 at Pinnacle).
Has the line moved for Sofia Costoulas vs Tatiana Prozorova?
Since Sep 20, 12 PM ET, the moneyline has moved toward Tatiana Prozorova (Sofia Costoulas price improved from +127 to +134).
How current are these odds?
Odds are refreshed hourly from live sportsbook data (last update: September 20, 2026 at 7:00 PM UTC). Odds change quickly around game time — always verify the price at the book before betting.
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.