Win probability

Thursday, 6 August 2026

20 matches selected · 2 tournaments · model last ran 18:50 UTC

Umpiry rates 20 matches on Thursday, 6 August 2026. The closest is Juncheng Shang v Luciano Darderi at 53 % — the model’s most uncertain call of the day. The most one-sided is Jessica Pegula v Kamilla Rakhimova at 87 %. 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
17:55Montreal
ATP · hard
R32Shang J.Darderi L.53 %47 %Toss-up0–1
17:30Toronto
WTA · hard
R32Shnaider D.Kalinskaya A.54 %46 %Toss-up1–1
20:10Montreal
ATP · hard
R32Borges N.Hanfmann Y.54 %46 %Toss-up1–0
20:45Toronto
WTA · hard
R32Kostyuk M.Keys M.58 %42 %Toss-up1–2
15:10Toronto
WTA · hard
R32Gibson T.Alexandrova E.61 %39 %Slight edge1–1
22:15Montreal
ATP · hard
R64Khachanov K.Atmane T.64 %36 %Slight edge0–1
22:55Montreal
ATP · hard
R64Humbert U.Merida Aguilar D.65 %35 %Slight edge0–1
23:15Toronto
WTA · hard
R64Fernandez L.Zarazua R.70 %30 %Clear favourite3–0
19:35Montreal
ATP · hard
R32De Minaur A.Norrie C.72 %28 %Clear favourite3–5
22:05Toronto
WTA · hard
R64Krejcikova B.Samsonova L.73 %27 %Clear favourite1–4
23:35Toronto
WTA · hard
R64Cirstea S.Joint M.74 %26 %Clear favourite1–1
22:45Toronto
WTA · hard
R64Noskova L.Mcnally C.77 %23 %Clear favourite0–2
23:10Montreal
ATP · hard
R64Medvedev D.Van De Zandschulp B.78 %22 %Clear favourite4–1
01:00Toronto
WTA · hard
R64Eala A.Parks A.78 %22 %Clear favourite1–1
00:35Montreal
ATP · hard
R64Paul T.Royer V.80 %20 %Clear favourite1–0
22:10Montreal
ATP · hard
R64Mensik J.Fearnley J.81 %19 %Strong favourite1–0
01:05Montreal
ATP · hard
R64Tien L.Monfils G.81 %19 %Strong favourite2–0
17:55Montreal
ATP · hard
R32Fils A.Navone M.82 %18 %Strong favourite1–1
16:40Toronto
WTA · hard
R32Swiatek I.Golubic V.83 %17 %Strong favourite3–1
18:30Toronto
WTA · hard
R32Pegula J.Rakhimova K.87 %13 %Strong 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.

Yesterday

Wednesday, 5 August 2026 · 20 matches

Favourites won

16 / 20

Model expected

13.5

The model expected 13.5 favourites to win; 16 did. See yesterday’s page.

Biggest shock, last 7 days

5 Aug
Montreal
ATP · hard
R64

Surprise score

92

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.