The School of Tennis Oddsodds.tennis
Default modelInterquartile mean (Vetted List)
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Sloane Stephens v Anhelina Kalinina

Kickoff: 2026-04-21 16:00 UTC

Closing line — the calculated probabilities and expected value from the last prices recorded before kickoff, under your selected model. The game has started, so these are not live figures. Assess the reliability of each model's probability predictions against all settled-game outcomes →

Head to Head

18 sportsbooks (7 in analysis )

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

Sloane Stephens (Local)

Prediction 18.36%5.45fair odd
EV +6.51%
Edge +1.12%
Kelly +1.36%
Growth +0.088%

assuming max odds 5.80

Bookmakers’ predictions’ distribution
16.18%18.23%19.04%21.70%MIN.MEANMEDIANMAX.
Odds’ distribution
4.304.954.905.8023.26%20.19%20.41%17.24%MIN.MEANMEDIANMAX.

Anhelina Kalinina (Visit)

Prediction 81.64%1.22fair odd
EV -0.403%
Edge -0.330%
Kelly -1.83%
Growth +0.000%

assuming max odds 1.22

Bookmakers’ predictions’ distribution
78.30%81.77%80.96%83.82%MIN.MEANMEDIANMAX.
Odds’ distribution
1.121.161.171.2289.29%85.88%85.47%81.97%MIN.MEANMEDIANMAX.

At the last prices before kickoff, Interquartile mean (Vetted List) estimated these probabilities for Head to Head: Sloane Stephens (Local): 18.36%; Anhelina Kalinina (Visit): 81.64%. For Sloane Stephens (Local), that estimate was equivalent to fair decimal odds of 5.45. 4 bookmakers offered closing odds above that level; the best were 5.80, corresponding to a positive expected value of +6.51%.

Sportsbook Odds (18 sportsbooks)

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BookmakerLocal ▼VisitMarginUpdated
FanDuel🎯5.80I 17.24%NM 16.18%EV +6.51%E +1.12%K +1.36%G +0.088%1.12I 89.29%NM 83.82%EV -8.57%E -7.65%K -71.39%G +0.000%6.5%2026-04-21 15:45
Betway🎯5.50I 18.18%NM 17.29%EV +0.997%E +0.181%K +0.222%G +0.002%1.15I 86.96%NM 82.71%EV -6.12%E -5.32%K -40.78%G +0.000%5.1%2026-04-21 15:45
888sport🎯5.50I 18.18%NM 16.92%EV +0.997%E +0.181%K +0.222%G +0.002%1.12I 89.29%NM 83.08%EV -8.57%E -7.65%K -71.39%G +0.000%7.5%2026-04-21 15:45
Mr Green (SE)🎯5.50I 18.18%NM 16.92%EV +0.997%E +0.181%K +0.222%G +0.002%1.12I 89.29%NM 83.08%EV -8.57%E -7.65%K -71.39%G +0.000%7.5%2026-04-21 15:45
NordicBet🎯5.30I 18.87%NM 17.70%EV -2.68%E -0.505%K -0.622%G +0.000%1.14I 87.72%NM 82.30%EV -6.93%E -6.08%K -49.53%G +0.000%6.6%2026-04-21 15:45
BetOnline.ag🎯5.06I 19.76%NM 19.04%EV -7.08%E -1.40%K -1.74%G +0.000%1.19I 84.03%NM 80.96%EV -2.85%E -2.40%K -15.01%G +0.000%3.8%2026-04-21 15:45
LowVig.ag🎯5.06I 19.76%NM 19.04%EV -7.08%E -1.40%K -1.74%G +0.000%1.19I 84.03%NM 80.96%EV -2.85%E -2.40%K -15.01%G +0.000%3.8%2026-04-21 15:45
Pinnacle🎯5.04I 19.84%NM 19.10%EV -7.45%E -1.48%K -1.84%G +0.000%1.19I 84.03%NM 80.90%EV -2.85%E -2.40%K -15.01%G +0.000%3.9%2026-04-21 15:05
888sport (SE)🎯5.00I 20.00%NM 18.57%EV -8.18%E -1.64%K -2.05%G +0.000%1.14I 87.72%NM 81.43%EV -6.93%E -6.08%K -49.53%G +0.000%7.7%2026-04-21 15:45
Coral🎯4.80I 20.83%NM 19.60%EV -11.86%E -2.47%K -3.12%G +0.000%1.17I 85.47%NM 80.40%EV -4.48%E -3.83%K -26.38%G +0.000%6.3%2026-04-21 15:45
BoyleSports🎯4.80I 20.83%NM 19.60%EV -11.86%E -2.47%K -3.12%G +0.000%1.17I 85.47%NM 80.40%EV -4.48%E -3.83%K -26.38%G +0.000%6.3%2026-04-21 15:45
theScore Bet🎯4.80I 20.83%NM 19.46%EV -11.86%E -2.47%K -3.12%G +0.000%1.16I 86.21%NM 80.54%EV -5.30%E -4.57%K -33.13%G +0.000%7.0%2026-04-21 15:45
Fliff🎯4.75I 21.05%NM 19.35%EV -12.77%E -2.69%K -3.41%G +0.000%1.14I 87.72%NM 80.65%EV -6.93%E -6.08%K -49.53%G +0.000%8.8%2026-04-21 15:45
PlayUp🎯4.60I 21.74%NM 20.55%EV -15.53%E -3.38%K -4.31%G +0.000%1.19I 84.03%NM 79.45%EV -2.85%E -2.40%K -15.01%G +0.000%5.8%2026-04-21 15:05
Bovada🎯4.50I 22.22%NM 21.33%EV -17.37%E -3.86%K -4.96%G +0.000%1.22I 81.97%NM 78.67%EV -0.403%E -0.330%K -1.83%G +0.000%4.2%2026-04-21 15:39
William Hill🎯4.50I 22.22%NM 20.63%EV -17.37%E -3.86%K -4.96%G +0.000%1.17I 85.47%NM 79.37%EV -4.48%E -3.83%K -26.38%G +0.000%7.7%2026-04-21 15:05
Ladbrokes (UK)🎯4.33I 23.09%NM 21.70%EV -20.49%E -4.73%K -6.15%G +0.000%1.20I 83.33%NM 78.30%EV -2.04%E -1.70%K -10.18%G +0.000%6.4%2026-04-21 15:45
TAB🎯4.30I 23.26%NM 21.53%EV -21.04%E -4.89%K -6.38%G +0.000%1.18I 84.75%NM 78.47%EV -3.67%E -3.11%K -20.38%G +0.000%8.0%2026-04-21 15:05
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 (5)

BookmakerLocalVisitMargin ▲Updated
Betfair Exchange (AU)◎5.20I 19.23%NM 19.13%1.23I 81.30%NM 80.87%0.5%2026-04-21 15:45
Smarkets◎5.70I 17.54%NM 17.39%1.20I 83.33%NM 82.61%0.9%2026-04-21 15:45
Betfair Exchange (UK)◎5.70I 17.54%NM 17.39%1.20I 83.33%NM 82.61%0.9%2026-04-21 15:45
Betfair Exchange (EU)◎5.10I 19.61%NM 19.30%1.22I 81.97%NM 80.70%1.6%2026-04-21 15:45
Novig◎5.62I 17.79%NM 16.86%1.14I 87.72%NM 83.14%5.5%2026-04-21 15:45