Lois Boisson vs Dayana YastremskaHamburg Semi-final

Hamburg · WTA · Semi-final
#158WTA
1728ELO
1694Clay ELO
$57kYTD
$1.2MCAREER
23 yrs · 175 cm · Right-handed
Last 10 · pre-match
LLLLWLLLLW
2 — 0
Sets
Monday, 14 July 2025
clay
#74WTA
1792ELO
1731Clay ELO
$505kYTD
$6.5MCAREER
26 yrs · 175 cm · Right-handed
Last 10 · pre-match
LWLWLWLWWW
Boisson L.
6-1 7-6
Yastremska D.
Boisson L.
6772
Yastremska D.
1650

Lois Boisson defeated Dayana Yastremska 6-1 7-6 in the Hamburg semi-final on clay. The upset overturned the form book — Dayana Yastremska came in ranked #74.

Key context

  • Match story: Lois Boisson came through a tight passage before pulling clear — 6–1 7–6.

Head to head

No previous meetings on record.

Serve vs return

This season
Boisson L.serving73% hold

wins 60% of points on serve vs Yastremska D.

Yastremska D.serving66% hold

wins 57% of points on serve vs Boisson L.

Serve advantage — Boisson L.

Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About

Serve & return on clay

Boisson L.Yastremska D.
Serve
10
Return
24

Per-surface Serve / Return Rating (0–100, percentile within the clay field, opponent-adjusted over 52 weeks). About

Statistics

This season
1st serve in·Even
63%
59%
1st serve points won·Slight edge
69%
63%
2nd serve points won·Even
45%
49%
Service points won·Even
60%
57%
Return points won·Even
44%
44%
Break points saved·Even
59%
57%
Aces / match·Slight edge
4.2
3.0
Double faults / match·Dominant
3.3
4.9

Averages over each player's completed matches in the selected window (42 vs 76). ATP, WTA & Challenger.

Umpiry Score

Pre-match
6.8
Slight advantageUmpiry Score
5.7
Slight disadvantageUmpiry Score
  • Surface jump clay↔grass (−0.8)
Form & Matchup
5.9Clay Elo 1694
Surface ELO
4.1+37 Clay Elo edge
5.1Overall Elo 1728
ELO gap
4.9Overall Elo 1792
5.0No prior meetings
H2H
5.0
7.9
Surface form
5.8
Fatigue & Travel
Minutes 14d
6.9
7.0
3-set count
4.0
Prev. match
9.0
Surface transition
3.0
Context
5.0
Defending pts
5.0

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.

Freshness

Recent load
Freshness·Even
97
93

Boisson L.: 13 days rest · 1 match (14d) · Yastremska D.: 12 days rest · 2 matches (14d). Higher means fresher. About

Conditions

Court speed
Medium-slowfavours grinders
SlowFast