Chun Hsin Tseng vs Rei Sakamoto — Kobe CH Quarter-final

Kobe CH · CHALLENGER · Quarter-final
Chun Hsin Tseng
TPE1
Chun Hsin Tseng
#229ATP
1554ELO
1495Hard ELO
$99kYTD
$1.7MCAREER
24 yrs · 175 cm · Right-handed
Last 10 · pre-match
LLWWLWLWLW
2 — 1
Sets
Monday, 10 November 2025
hard
JPN6
Rei Sakamoto
#150ATP
1608ELO
1589Hard ELO
$233kYTD
$492kCAREER
20 yrs · 193 cm · Right-handed
Last 10 · pre-match
LWLWWLLWWW
Tseng C.
4-6 6-1 7-6
Sakamoto R.
Tseng C.
467132
Sakamoto R.
616111

Chun Hsin Tseng defeated Rei Sakamoto 4-6 6-1 7-6 in the Kobe CH quarter-final on hard. The upset overturned the form book — Rei Sakamoto came in ranked #150, defending last year's round of 32.

Key context

Head to head

No previous meetings on record.

Serve vs return

This season
Tseng C.serving80% hold

wins 63% of points on serve vs Sakamoto R.

Sakamoto R.serving83% hold

wins 65% of points on serve vs Tseng C.

Even serve battle

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
Tseng C.Sakamoto R.
1st serve in·Even
60%
63%
1st serve points won·Slight edge
68%
73%
2nd serve points won·Even
52%
51%
Service points won·Even
61%
65%
Return points won·Even
39%
37%
Break points saved·Even
60%
61%
Aces / match·Dominant
2.9
6.9
Double faults / match·Even
2.0
2.1

Averages over each player's completed matches in the selected window (94 vs 87). ATP, WTA & Challenger.

Clutch

Under pressure
Tseng C.Sakamoto R.
Clutch Rating·Clear edge
26
49
Break points saved·Even
83
87
Break points won·Slight edge
15
8
Deciding sets·Dominant
31
93
Tiebreaks·Even
23
23

Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About

Umpiry Score

Pre-match
Tseng C.
5.4
Clear underdogUmpiry Score
Sakamoto R.
6.2
Even matchUmpiry Score
Form & Matchup
3.5Hard Elo 1495
Surface ELO
6.5+94 Hard Elo edge
3.7Overall Elo 1554
ELO gap
6.3Overall Elo 1608
5.0No prior meetings
H2H
5.0
3.1
Surface form
2.7
0.0Lost last 2
Win streak
0.0Lost last 3
Fatigue & Travel
7.1
Minutes 14d
7.0
3-set count
9.0
Prev. match
Context
5.0
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.

Freshness

Recent load
Tseng C.Sakamoto R.
Freshness·Slight edge
100
92

Tseng C.: 19 days rest · Sakamoto R.: 9 days rest · 2 matches (14d). Higher means fresher. About

Conditions

Court speed
Medium-fastrewards aggression
SlowFast
Final
Watanuki Y.[4]
Ymer E.[7]
3-66-16-4
Semi-finals
Watanuki Y.[4]
Tseng C.[1]
2-66-26-1
Ymer E.[7]
Uchida K.
6-44-66-3
Quarter-finals
Uchida K.
Shimabukuro S.[3]
7-635-72-0
Watanuki Y.[4]
Grenier H.[5]
7-6116-3
Ymer E.[7]
Huesler M.
7-55-76-4
Tseng C.[1]
Sakamoto R.[6]
4-66-17-611
R16
Ymer E.[7]
Tokuda R.
6-10-1
Watanuki Y.[4]
Ferreira Silva F.
6-46-4
Sakamoto R.[6]
Barton H.
3-66-36-4
Grenier H.[5]
Hsu Y.
6-26-2
Uchida K.
Crawford O.[8]
6-7106-36-4
Tseng C.[1]
Chung H.
1-66-27-5
Shimabukuro S.[3]
Jones M.
3-66-36-4
Huesler M.
Nishioka Y.[2]
W/O
R32
Ymer E.[7]
Peniston R.
6-26-741-1
Tseng C.[1]
Kuzmanov D.
6-46-1
Chung H.
Matsuda R.
6-16-4
Barton H.
Nam J.
6-786-47-66
Sakamoto R.[6]
Basing M.
7-666-746-3
Watanuki Y.[4]
Bigun K.
6-46-2
Crawford O.[8]
Uchiyama Y.
6-716-47-67
Jones M.
Leong M.
7-663-66-1
Shimabukuro S.[3]
Isomura K.
7-616-4
Tokuda R.
Taguchi R.
6-36-4
Nishioka Y.[2]
Jung J.
1-66-36-4
Grenier H.[5]
Ribeiro Marcondes I.
6-27-66
Uchida K.
Takahashi Y.
4-66-36-4
Huesler M.
Johns G.
6-37-5
Ferreira Silva F.
Zhukov M.
7-616-2
Hsu Y.
Shimizu Y.
7-656-4