Win probability

Sunday, 2 August 2026

20 matches selected · 12 tournaments · model last ran 20:50 UTC

Umpiry rates 20 matches on Sunday, 2 August 2026. The closest is Oleg Prihodko v Tiago Pereira at 50 % — the model’s most uncertain call of the day. The most one-sided is Sara Bejlek v Xiyu Wang at 89 %. 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
10:10M25 Koszalin
ITF · clay
FPrihodko O.Pereira T.50 %50 %Toss-up0–1
03:00Los Cabos
ATP · hard
FShapovalov D.Gea A.51 %49 %Toss-up0–1
17:00W100 Gran Canaria-Maspalomas
ITF · clay
FCengiz B.Pigossi L.52 %48 %Toss-up0–1
02:00Vancouver
CHALLENGER · hard
FWolf J.Lajal M.53 %47 %Toss-up1–0
11:00M15 Dublin
ITF · hard
FMolder M.Gannon C.53 %47 %Toss-up0–1
17:40Memphis
WTA · hard
FVidmanova D.Liutova K.55 %45 %Toss-up0–1
15:10Montreal
ATP · hard
R128Munar J.Hijikata R.55 %45 %Toss-up2–0
12:15W35 Aldershot
ITF · hard
FKarunaratne A.Saigo R.56 %44 %Toss-up0–2
08:00W15 Rogaska Slatina
ITF · clay
FMikaca S.Senica A.57 %43 %Toss-up0–1
20:15Toronto
WTA · hard
R128Ito A.Sebov K.59 %41 %Slight edge0–1
19:10Toronto
WTA · hard
R128Birrell K.Golubic V.59 %41 %Slight edge1–3
10:00M25 Gentofte
ITF · clay
FNesterov P.Emil Overbeck C.62 %38 %Slight edge1–0
00:45Washington
ATP · hard
SFJodar R.Tabilo A.65 %35 %Slight edge2–1
19:10Toronto
WTA · hard
R128Bouzas Maneiro J.Arseneault A.69 %31 %Clear favourite1–0
22:40Washington
ATP · hard
SFFritz T.Nakashima B.70 %30 %Clear favourite4–2
15:10Montreal
ATP · hard
R128Shang J.Vallejo A.70 %30 %Clear favourite1–0
21:05Toronto
WTA · hard
R128Osorio C.Stefanini L.76 %24 %Clear favourite1–0
18:25Toronto
WTA · hard
R128Rakhimova K.Williams V.82 %18 %Strong favourite1–0
20:45Toronto
WTA · hard
R128Bucsa C.Uchijima M.88 %12 %Strong favourite0–1
19:10Toronto
WTA · hard
R128Bejlek S.Wang X.89 %11 %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

Saturday, 1 August 2026 · 20 matches

Favourites won

11 / 20

Model expected

11.6

The model expected 11.6 favourites to win; 11 did. See yesterday’s page.

Biggest shock, last 7 days

31 Jul
Bonn
CHALLENGER · clay
QF

Surprise score

90

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.