Katie Boulter vs Donna Vekic — London Semi-final

London · WTA · Semi-final

GBR

Katie Boulter

#73WTA

1816ELO

1734Grass ELO

29 yrs · 180 cm · Right-handed

Last 10

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Sets

Saturday, 13 June 2026 · 10:00

grass

CRO

Donna Vekic

#76WTA

1777ELO

1687Grass ELO

29 yrs · 179 cm · Right-handed

Last 10

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Katie Boulter faces Donna Vekic in the London semi-final on grass. Katie Boulter holds the paper edge — ranked #73, leading the head-to-head 1–0, a roughly 50-point grass Elo advantage.

Key context

Fatigue load: Katie Boulter carries the heavier recent load — 2 three-setters to 1 in the past fortnight.
Head-to-head: Katie Boulter leads the head-to-head 1–0, but this is their first meeting on grass. Last met at San Diego 2024.
Win streak: Both arrive in form — Katie Boulter on a 3-match run, Donna Vekic on 4.

Win Probability

Pre-match · updated 21:21 UTC

Boulter K.56%

Vekic D.44%

Toss-up
50–58%

Slight edge
58–67%

Clear favourite
67–80%

Strong favourite
80%+

Toss-up · Too close to call

Calibrated model · 65% favourite accuracy (2025–26, out-of-sample). Probability is a statistical estimate, not a certainty. How it works.

Umpiry Score

Pre-match

Boulter K.

5.9

Even matchUmpiry Score

Back-to-back day (−0.5)

Vekic D.

5.2

Clear underdogUmpiry Score

Back-to-back day (−0.5)

Form & Matchup

5.6+47 Grass Elo edge

Surface ELO

4.4Grass Elo 1687

5.4Overall Elo 1816

ELO gap

4.6Overall Elo 1777

5.0First meeting on grass

H2H

5.0First meeting on grass

7.37 of last 10 on grass

Surface form

6.86 of last 10 on grass

7.03-match win streak

Win streak

7.04-match win streak

Fatigue & Travel

4.02 three-setters in 14 days

3-set count

7.01 three-setter in 14 days

7.6Home country · 15/25 here

Country comfort

5.5Won 59% in GBR (34)

Context

5.0Didn't play here last year

Defending pts

5.0Didn't play here last year

The Umpiry Score combines match-context factors — matchup, form, fatigue, travel and motivation — into a single 0–10 score, updated daily. Read how it works.

Conditions

Weather forecast

17°CClear

Wind 17 km/hHumidity 49%

Head to head

1–0

Date	Tournament	Round	Surface	Winner	Score
2024-02-26	San Diego	QF	hard	Katie Boulter	6-4 6-3

Statistics

Recent form

Boulter K.Vekic D.

60%1st serve in+1%61%

67%1st serve points won+2%69%

46%2nd serve points won46%

59%Service points won+1%60%

46%Return points won+3%43%

56%Break points saved56%

2.9Aces / match+0.22.7

4.5Double faults / match+0.54

Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.