Win probability

Tuesday, 23 June 2026

15 matches selected · 4 tournaments · model last ran 14:50 UTC

Umpiry rates 15 matches on Tuesday, 23 June 2026. The closest is Anastasia Zakharova v Yuliia Starodubtseva at 50 % — the model’s most uncertain call of the day. The most one-sided is Elina Svitolina v Liudmila Samsonova at 78 %. Probabilities come from a per-tour model trained on Elo, surface Elo, recent serve and return form and layoff.

Rated matches · ordered closest first
TimeTournamentRoundMatchProbabilityVerdictH2H
10:10Eastbourne
WTA · grass
R32Zakharova A.Starodubtseva Y.50 %50 %Toss-up1–0
12:50Eastbourne
WTA · grass
R32Bondar A.Udvardy P.53 %47 %Toss-up1–2
13:45Eastbourne
ATP · grass
R32Burruchaga R.Fery A.54 %46 %Toss-up0–2
13:40Bad Homburg
WTA · grass
R16Osaka N.Mertens E.54 %46 %Toss-up7–3
11:45Mallorca
ATP · grass
R16Kecmanovic M.Sonego L.56 %44 %Toss-up4–5
13:10Mallorca
ATP · grass
R32Tsitsipas S.Buse I.58 %42 %Toss-up1–1
11:45Mallorca
ATP · grass
R16Borges N.Lennard Struff J.58 %42 %Toss-up2–0
15:40Mallorca
ATP · grass
R16Darderi L.Hanfmann Y.58 %42 %Toss-up7–0
11:35Eastbourne
WTA · grass
R32Bejlek S.Siegemund L.58 %42 %Slight edge1–1
09:40Bad Homburg
WTA · grass
R32Alexandrova E.Li A.59 %41 %Slight edge3–1
09:10Bad Homburg
WTA · grass
R32Navarro E.Lys E.63 %37 %Slight edge1–0
11:00Bad Homburg
WTA · grass
R16Fernandez L.Wang X.66 %34 %Slight edge2–2
10:05Eastbourne
WTA · grass
R32Mcnally C.Tjen J.68 %32 %Clear favourite3–0
09:40Bad Homburg
WTA · grass
R32Noskova L.Gabriela Ruse E.76 %24 %Clear favourite0–1
15:35Bad Homburg
WTA · grass
R16Svitolina E.Samsonova L.78 %22 %Clear favourite1–0

How to read this

Each row gives the model’s probability that the favourite wins, and the verdict says the same thing in words. Rows are ordered by how close the model thinks the match is, so the top of the table is where it is least sure. A 70 % favourite losing is not a broken model — it is the 30 %. Probabilities are not odds and take no account of any market.

How often the model has been right

Umpiry win-probability model accuracy by tour family, measured on the predictions the model made
TourCorrect
ATP / WTA66 %
Challenger (men)64 %
Challenger (women)68 %
ITF (men)66 %
ITF (women)64 %

Measured on the predictions the model actually made, not on a backtest — see Methodology.

Questions

How is the probability calculated?
A separate model for each tour, trained on Elo, surface-specific Elo, recent serve and return form and time since the player’s last match. It runs several times a day; the time of the last run is at the top of this page.
How often is the model right?
We publish it. The table above gives the hit rate for each tour family, measured on the predictions the model actually made — see Methodology for how it is computed.
Why are the closest matches at the top?
Rows are ordered by distance from 50 %, so the table opens where the model is least sure. “Most one-sided” reverses the order and groups the rows by tournament.
Is this a betting tip?
No. The page shows a model’s probability and how often that model has been right. There are no odds, no comparison with a market and no suggested stake.