Alyssa Ahn vs Klara Kosan — W15 Rancho Santa Fe CA Quarter-final

W15 Rancho Santa Fe CA · CHALLENGER · Quarter-final
USA
Alyssa Ahn
#880WTA
19 yrs
Last 10 · pre-match
LLWLWWWLWL
2 — 1
Sets
Monday, 16 June 2025
hard
USA
Klara Kosan
#1343WTA
24 yrs
Last 10 · pre-match
LWLLWLLWLW
Ahn A.
6-3 4-6 6-2
Kosan K.
Ahn A.
6462
Kosan K.
3621

Alyssa Ahn defeated Klara Kosan 6-3 4-6 6-2 in the W15 Rancho Santa Fe CA quarter-final on hard.

Key context

  • Match story: Alyssa Ahn closed it out in three sets, 6–3 4–6 6–2.

Head to head

No previous meetings on record.

Serve vs return

This season
Ahn A.serving52% hold

wins 51% 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·Even
63%
59%
1st serve points won·Even
60%
56%
2nd serve points won·Slight edge
49%
43%
Service points won·Slight edge
56%
51%
Return points won·Even
48%
46%
Break points saved·Even
51%
50%
Aces / match·Even
0.7
0.9
Double faults / match·Dominant
0.9
5.1

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

Umpiry Score

Pre-match
Ahn A.
6.9
Slight advantageUmpiry ScorePartial · surface data limited
Kosan K.
5.2
Clear underdogUmpiry ScorePartial · surface data limited
Form & Matchup
10.0No prior meetings
H2H
0.0
6.9
Surface form
2.6
Win streak
0.0Lost last 3
Fatigue & Travel
7.0
3-set count
Context
6.0
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
Cayetano E.
Nguyen A.
6-766-26-0
Semi-finals
Nguyen A.
Ahn A.
6-46-2
Cayetano E.
Nguyen A.
6-16-0
Quarter-finals
Cayetano E.
Sahdiieva A.
2-66-46-2
Ahn A.
Kosan K.
6-34-66-2
Nguyen A.
Chan J.
6-25-2
Nguyen A.
Frodin T.
6-16-2
R16
Cayetano E.
Martinez Solis C.
6-16-3
Nguyen A.
Wang T.
6-17-5
Frodin T.
Katsumi N.
4-66-46-4
Chan J.
Iyengar M.
6-36-4
Kosan K.
Fairclough L.
7-646-3
Nguyen A.
Driscoll C.
2-67-56-3
Ahn A.
Mushika M.
6-03-0
Sahdiieva A.
Chang L.
4-67-56-2
R32
Nguyen A.
Carneiro O.
6-06-2
Sahdiieva A.
Kockinis A.
3-66-46-0
Iyengar M.
Atturu S.
6-37-5
Frodin T.
Leon S.
6-36-4
Fairclough L.
Arora A.
6-46-1
Katsumi N.
Atay S.
7-637-5
Driscoll C.
Ansari C.
6-46-0
Kosan K.
Mushika M.
6-27-5
Martinez Solis C.
Kiss C.
6-44-66-4
Wang T.
Arakawa N.
6-16-0
Ahn A.
Nicholson S.
6-36-2
Chan J.
Kinard T.
5-76-36-2
Nguyen A.
Foshee I.
6-34-66-1
Cayetano E.
Castillo Meza M.
6-26-0
Mushika M.
Giavara H.
1-66-46-4
Chang L.
Miroshnichenko V.
3-66-46-4