Alyssa Ahn vs Klara Kosan — W15 San Diego CA Round of 32

W15 San Diego CA · CHALLENGER · Round of 32
USA
Alyssa Ahn
#880WTA
19 yrs
Last 10 · pre-match
LLWLWWWLWL
0 — 0
Sets
Monday, 9 June 2025
hard
USA
Klara Kosan
#1343WTA
24 yrs
Last 10 · pre-match
LWLLWLLWLW
Ahn A.
6-1 7-5
Kosan K.
Ahn A.
672
Kosan K.
15–

Alyssa Ahn defeated Klara Kosan 6-1 7-5 in the W15 San Diego CA round of 32 on hard.

Key context

  • Match story: Alyssa Ahn came through a tight passage before pulling clear — 6–1 7–5.

Head to head

No previous meetings on record.

Serve vs return

This season
Ahn A.serving50% hold

wins 50% of points on serve vs Kosan K.

Kosan K.serving37% hold

wins 45% of points on serve vs Ahn A.

Baseline battle — serve is shaky, expect plenty of breaks

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

Statistics

This season
Ahn A.Kosan K.
1st serve in·Slight edge
64%
59%
1st serve points won·Even
59%
56%
2nd serve points won·Even
48%
44%
Service points won·Even
55%
51%
Return points won·Even
48%
46%
Break points saved·Even
52%
48%
Aces / match·Even
0.7
0.9
Double faults / match·Dominant
0.9
5.2

Averages over each player's completed matches in the selected window (23 vs 17). ATP, WTA & Challenger.

Umpiry Score

Pre-match
Ahn A.
4.3
Heavy underdogUmpiry ScorePartial · surface data limited
  • Extended break: 105 days (−1.5)
Kosan K.
4.5
Heavy underdogUmpiry ScorePartial · surface data limited
  • Extended break: 42 days (−0.7)
Form & Matchup
5.0No prior meetings
H2H
5.0
5.1
Surface form
2.9
0.0
Win streak
0.0Lost last 2
Context
8.5
Defending pts
6.0

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.

Conditions

Court speed
Slowlow bounce, long rallies
SlowFast

Draw

Final
Swan K.
Radanovic D.
6-46-0
Taylor L.
Schuman A.
5-76-26-1
Mushika M.
Ahn A.
7-56-3
Semi-finals
Swan K.
Hill C.
6-46-1
Radanovic D.
Mushika M.
7-696-2
Mushika M.
Wang T.
6-27-65
Ahn A.
Rogozinska Dzik S.
7-57-64
Quarter-finals
Swan K.
Sahdiieva A.
6-36-3
Hill C.
Center O.
5-76-36-4
Radanovic D.
An C.
6-06-2
Mushika M.
Rogozinska Dzik S.
2-66-26-3
Mushika M.
Radanovic D.
4-63-1
Rogozinska Dzik S.
Sahdiieva A.
6-26-0
Ahn A.
Atay S.
6-46-1
Mushika M.
Miroshnichenko V.
6-20-67-65
Wang T.
Mushika M.
6-26-1
R16
Swan K.
Schuman A.
6-06-2
Mushika M.
Taylor L.
4-66-16-2
Rogozinska Dzik S.
Vagramov A.
6-16-3
Center O.
Walker B.
7-666-2
Sahdiieva A.
Castillo Meza M.
6-17-65
Radanovic D.
Wang T.
6-37-5
An C.
Kinard T.
7-637-62
Ahn A.
Taylor L.
6-41-66-3
Mushika M.
Suh S.
6-24-66-3
Atay S.
Aytoyan M.
6-36-3
Mushika M.
Frodin T.
6-36-2
Rogozinska Dzik S.
Spink I.
6-46-2
Wang T.
Iyengar M.
6-04-66-3
Miroshnichenko V.
Chan J.
6-43-66-1
Sahdiieva A.
Chen Y.
6-27-5
R32
An C.
Suh S.
1-66-26-2
Swan K.
Colling S.
6-36-3
Walker B.
Varul L.
6-36-3
Mushika M.
Fairclough L.
6-06-1
Taylor L.
Adair M.
6-06-0
Vagramov A.
Deming E.
6-26-2
Center O.
Smejkalova A.
6-34-66-4
Sahdiieva A.
Fulgenzi B.
7-606-1
Castillo Meza M.
Payne B.
6-46-1
Mushika M.
Markham A.
6-756-26-4
Rogozinska Dzik S.
Chen Y.
6-07-64
Kinard T.
Dunyon J.
6-43-66-3
Wang T.
Narendran T.
6-37-5
Schuman A.
Alicea S.
7-56-3
Hill C.
Kiss C.
7-53-60-0
Atay S.
Radanovic D.
6-40-0
Chan J.
Luescher S.
6-716-36-2
Ahn A.
Kosan K.
6-17-5
Frodin T.
Atturu S.
6-36-2
Suh S.
Barksdale K.
6-26-2
Chen Y.
Leacock Y.
6-26-0
Aytoyan M.
Adair M.
6-06-1
Mushika M.
Cruz A.
6-36-1
Iyengar M.
Kiss C.
6-46-2
Rogozinska Dzik S.
Nordikyan K.
6-26-0
Mushika M.
Carneiro O.
6-16-4
Sahdiieva A.
Allegre O.
6-26-3
Taylor L.
Fairclough L.
7-626-4
Spink I.
Castillo Meza M.
2-67-626-3
Wang T.
Deming E.
6-26-3
Miroshnichenko V.
Giavara H.
6-46-4