The School of Tennis Oddsodds.tennis
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Marta Kostyuk v Sloane Stephens

2026-08-18 12:00 UTC — WTA Cincinnati Open

Head to Head

54 sportsbooks (18 in analysis )

Estimated chance of each outcome, according to the model: Interquartile mean (Vetted List)

Marta Kostyuk (Local)

Prediction 80.92%1.24fair odd
EV -2.90%
Edge -2.42%
Kelly -14.50%
Growth +0.000%

assuming max odds 1.20

Bookmakers’ predictions’ distribution
77.78%80.92%80.95%82.96%MIN.MEANMEDIANMAX.
Odds’ distribution
1.131.161.161.2088.50%86.01%86.21%83.33%MIN.MEANMEDIANMAX.

Sloane Stephens (Visit)

Prediction 19.08%5.24fair odd
EV +6.87%
Edge +1.23%
Kelly +1.49%
Growth +0.103%

assuming max odds 5.60

Bookmakers’ predictions’ distribution
17.04%19.08%19.05%22.22%MIN.MEANMEDIANMAX.
Odds’ distribution
4.204.995.105.6023.81%20.04%19.61%17.86%MIN.MEANMEDIANMAX.

For Head to Head, Interquartile mean (Vetted List) estimates these probabilities: Marta Kostyuk (Local): 80.92%; Sloane Stephens (Visit): 19.08%. For Sloane Stephens (Visit), that estimate is equivalent to fair decimal odds of 5.24. 20 bookmakers offer odds above that level; the best available odds are 5.60, producing a positive expected value of +6.87%.

Sportsbook Odds (54 sportsbooks)

We're not affiliated with any bookmaker, we earn nothing from any action done with them.

BookmakerLocalVisit ▼MarginUpdated
FanDuel🎯1.15I 86.96%NM 82.96%EV -6.95%E -6.04%K -46.31%G +0.000%5.60I 17.86%NM 17.04%EV +6.87%E +1.23%K +1.49%G +0.103%4.8%2026-08-17 05:44
Coolbet🎯1.18I 84.75%NM 82.34%EV -4.52%E -3.83%K -25.11%G +0.000%5.50I 18.18%NM 17.66%EV +4.96%E +0.902%K +1.10%G +0.055%2.9%2026-08-17 06:09
Paddy Power🎯1.14I 87.72%NM 82.83%EV -7.76%E -6.80%K -55.40%G +0.000%5.50I 18.18%NM 17.17%EV +4.96%E +0.902%K +1.10%G +0.055%5.9%2026-08-17 05:39
Sky Bet🎯1.14I 87.72%NM 82.83%EV -7.76%E -6.80%K -55.40%G +0.000%5.50I 18.18%NM 17.17%EV +4.96%E +0.902%K +1.10%G +0.055%5.9%2026-08-17 05:38
DraftKings🎯1.16I 86.21%NM 82.26%EV -6.14%E -5.29%K -38.36%G +0.000%5.38I 18.59%NM 17.74%EV +2.67%E +0.497%K +0.610%G +0.016%4.8%2026-08-17 03:09
Virgin Bet🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
Unibet (SE)🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:34
LiveScore Bet🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
LeoVegas (SE)🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
Casumo🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:34
TABtouch🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:34
Grosvenor🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:34
BetRivers🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
Unibet (NL)🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
Unibet🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
ATG (SE)🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
Bally Bet🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:34
betPARX🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
Svenska Spel🎯1.16I 86.21%NM 82.04%EV -6.14%E -5.29%K -38.36%G +0.000%5.30I 18.87%NM 17.96%EV +1.15%E +0.216%K +0.266%G +0.003%5.1%2026-08-17 06:35
Hard Rock Bet🎯1.15I 86.96%NM 82.03%EV -6.95%E -6.04%K -46.31%G +0.000%5.25I 19.05%NM 17.97%EV +0.192%E +0.036%K +0.045%G +0.000%6.0%2026-08-17 06:54
NordicBet🎯1.17I 85.47%NM 81.63%EV -5.33%E -4.55%K -31.34%G +0.000%5.20I 19.23%NM 18.37%EV -0.763%E -0.147%K -0.182%G +0.000%4.7%2026-08-17 06:20
Betsson🎯1.17I 85.47%NM 81.63%EV -5.33%E -4.55%K -31.34%G +0.000%5.20I 19.23%NM 18.37%EV -0.763%E -0.147%K -0.182%G +0.000%4.7%2026-08-17 06:19
PointsBet (AU)🎯1.16I 86.21%NM 81.76%EV -6.14%E -5.29%K -38.36%G +0.000%5.20I 19.23%NM 18.24%EV -0.763%E -0.147%K -0.182%G +0.000%5.4%2026-08-17 05:45
SportsBet🎯1.13I 88.50%NM 82.15%EV -8.57%E -7.58%K -65.88%G +0.000%5.20I 19.23%NM 17.85%EV -0.763%E -0.147%K -0.182%G +0.000%7.7%2026-08-17 05:45
1xBet🎯1.20I 83.33%NM 81.16%EV -2.90%E -2.42%K -14.50%G +0.000%5.17I 19.34%NM 18.84%EV -1.34%E -0.258%K -0.320%G +0.000%2.7%2026-08-17 07:50
Fanatics🎯1.17I 85.47%NM 81.34%EV -5.33%E -4.55%K -31.34%G +0.000%5.10I 19.61%NM 18.66%EV -2.67%E -0.524%K -0.651%G +0.000%5.1%2026-08-17 06:10
GTbets🎯1.17I 85.47%NM 81.34%EV -5.33%E -4.55%K -31.34%G +0.000%5.10I 19.61%NM 18.66%EV -2.67%E -0.524%K -0.651%G +0.000%5.1%2026-08-17 03:04
Winamax (DE)🎯1.16I 86.21%NM 81.47%EV -6.14%E -5.29%K -38.36%G +0.000%5.10I 19.61%NM 18.53%EV -2.67%E -0.524%K -0.651%G +0.000%5.8%2026-08-17 06:20
PMU (FR)🎯1.14I 87.72%NM 81.73%EV -7.76%E -6.80%K -55.40%G +0.000%5.10I 19.61%NM 18.27%EV -2.67%E -0.524%K -0.651%G +0.000%7.3%2026-08-17 06:34
Bovada🎯1.18I 84.75%NM 80.91%EV -4.52%E -3.83%K -25.11%G +0.000%5.00I 20.00%NM 19.09%EV -4.58%E -0.916%K -1.14%G +0.000%4.7%2026-08-17 05:43
888sport🎯1.17I 85.47%NM 81.04%EV -5.33%E -4.55%K -31.34%G +0.000%5.00I 20.00%NM 18.96%EV -4.58%E -0.916%K -1.14%G +0.000%5.5%2026-08-17 02:54
William Hill🎯1.17I 85.47%NM 81.04%EV -5.33%E -4.55%K -31.34%G +0.000%5.00I 20.00%NM 18.96%EV -4.58%E -0.916%K -1.14%G +0.000%5.5%2026-08-17 02:54
betfred_uk🎯1.17I 85.47%NM 81.04%EV -5.33%E -4.55%K -31.34%G +0.000%5.00I 20.00%NM 18.96%EV -4.58%E -0.916%K -1.14%G +0.000%5.5%2026-08-17 05:45
Betr (AU)🎯1.16I 86.21%NM 81.17%EV -6.14%E -5.29%K -38.36%G +0.000%5.00I 20.00%NM 18.83%EV -4.58%E -0.916%K -1.14%G +0.000%6.2%2026-08-17 06:10
Tipico (DE)🎯1.13I 88.50%NM 81.57%EV -8.57%E -7.58%K -65.88%G +0.000%5.00I 20.00%NM 18.43%EV -4.58%E -0.916%K -1.14%G +0.000%8.5%2026-08-17 05:44
Unibet (UK)🎯1.16I 86.21%NM 80.86%EV -6.14%E -5.29%K -38.36%G +0.000%4.90I 20.41%NM 19.14%EV -6.49%E -1.32%K -1.66%G +0.000%6.6%2026-08-17 06:19
Marathon Bet🎯1.18I 84.75%NM 80.27%EV -4.52%E -3.83%K -25.11%G +0.000%4.80I 20.83%NM 19.73%EV -8.40%E -1.75%K -2.21%G +0.000%5.6%2026-08-17 06:35
BoyleSports🎯1.14I 87.72%NM 80.81%EV -7.76%E -6.80%K -55.40%G +0.000%4.80I 20.83%NM 19.19%EV -8.40%E -1.75%K -2.21%G +0.000%8.6%2026-08-17 05:45
Betway🎯1.18I 84.75%NM 80.10%EV -4.52%E -3.83%K -25.11%G +0.000%4.75I 21.05%NM 19.90%EV -9.35%E -1.97%K -2.49%G +0.000%5.8%2026-08-17 05:30
LeoVegas🎯1.14I 87.72%NM 80.65%EV -7.76%E -6.80%K -55.40%G +0.000%4.75I 21.05%NM 19.35%EV -9.35%E -1.97%K -2.49%G +0.000%8.8%2026-08-17 06:25
PlayUp🎯1.19I 84.03%NM 79.45%EV -3.71%E -3.12%K -19.53%G +0.000%4.60I 21.74%NM 20.55%EV -12.21%E -2.66%K -3.39%G +0.000%5.8%2026-08-17 07:35
BetMGM🎯1.19I 84.03%NM 79.45%EV -3.71%E -3.12%K -19.53%G +0.000%4.60I 21.74%NM 20.55%EV -12.21%E -2.66%K -3.39%G +0.000%5.8%2026-08-17 05:24
theScore Bet🎯1.17I 85.47%NM 79.72%EV -5.33%E -4.55%K -31.34%G +0.000%4.60I 21.74%NM 20.28%EV -12.21%E -2.66%K -3.39%G +0.000%7.2%2026-08-17 05:09
Ladbrokes (UK)🎯1.18I 84.75%NM 79.23%EV -4.52%E -3.83%K -25.11%G +0.000%4.50I 22.22%NM 20.77%EV -14.12%E -3.14%K -4.03%G +0.000%7.0%2026-08-17 05:24
Coral🎯1.18I 84.75%NM 79.23%EV -4.52%E -3.83%K -25.11%G +0.000%4.50I 22.22%NM 20.77%EV -14.12%E -3.14%K -4.03%G +0.000%7.0%2026-08-17 05:24
Bet Victor🎯1.17I 85.47%NM 79.37%EV -5.33%E -4.55%K -31.34%G +0.000%4.50I 22.22%NM 20.63%EV -14.12%E -3.14%K -4.03%G +0.000%7.7%2026-08-17 05:49
betano_uk🎯1.17I 85.47%NM 79.37%EV -5.33%E -4.55%K -31.34%G +0.000%4.50I 22.22%NM 20.63%EV -14.12%E -3.14%K -4.03%G +0.000%7.7%2026-08-17 05:42
Betclic (FR)🎯1.14I 87.72%NM 79.79%EV -7.76%E -6.80%K -55.40%G +0.000%4.50I 22.22%NM 20.21%EV -14.12%E -3.14%K -4.03%G +0.000%9.9%2026-08-17 05:44
ReBet🎯1.14I 87.72%NM 79.61%EV -7.76%E -6.80%K -55.40%G +0.000%4.45I 22.47%NM 20.39%EV -15.08%E -3.39%K -4.37%G +0.000%10.2%2026-08-17 06:20
TAB🎯1.18I 84.75%NM 78.85%EV -4.52%E -3.83%K -25.11%G +0.000%4.40I 22.73%NM 21.15%EV -16.03%E -3.64%K -4.71%G +0.000%7.5%2026-08-17 07:34
Winamax (FR)🎯1.13I 88.50%NM 79.19%EV -8.57%E -7.58%K -65.88%G +0.000%4.30I 23.26%NM 20.81%EV -17.94%E -4.17%K -5.44%G +0.000%11.8%2026-08-17 06:20
Unibet (FR)🎯1.13I 88.50%NM 79.00%EV -8.57%E -7.58%K -65.88%G +0.000%4.25I 23.53%NM 21.00%EV -18.89%E -4.45%K -5.81%G +0.000%12.0%2026-08-17 06:19
Neds🎯1.20I 83.33%NM 77.78%EV -2.90%E -2.42%K -14.50%G +0.000%4.20I 23.81%NM 22.22%EV -19.85%E -4.73%K -6.20%G +0.000%7.1%2026-08-17 05:24
Ladbrokes (AU)🎯1.20I 83.33%NM 77.78%EV -2.90%E -2.42%K -14.50%G +0.000%4.20I 23.81%NM 22.22%EV -19.85%E -4.73%K -6.20%G +0.000%7.1%2026-08-17 05:24
Margin = Margin (Overround) · I = Implied Probability · NM = No-Margin Probability · EV = Expected Value · E = Edge · K = Kelly Criterion · G = Bankroll Growth

Updated is when each book last changed its price, so an older time means the odds simply haven't moved, not that the price is stale. Books not seen in the last ~15 minutes are normally dropped; only if a whole market's feed goes quiet are the latest recorded prices shown instead.

Exchanges (6)

BookmakerLocalVisitMargin ▲Updated
Novig◎1.12I 89.29%NM 82.45%5.26I 19.01%NM 17.55%8.3%2026-08-17 06:20
Smarkets◎1.13I 88.50%NM 78.80%4.20I 23.81%NM 21.20%12.3%2026-08-17 06:20
Betfair Exchange (EU)◎1.16I 86.21%NM 50.64%1.19I 84.03%NM 49.36%70.2%2026-08-17 07:15
Betfair Exchange (AU)◎1.16I 86.21%NM 50.64%1.19I 84.03%NM 49.36%70.2%2026-08-17 07:14
Betfair Exchange (UK)◎1.16I 86.21%NM 50.64%1.19I 84.03%NM 49.36%70.2%2026-08-17 07:15
Matchbook◎1.13I 88.50%NM 50.66%1.16I 86.21%NM 49.34%74.7%2026-08-17 07:15

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