Player research cockpit

RiraKosaka

TennisJack analysis

Rira Kosaka currently has a useful TennisJack sample of 21 completed matches, with a 47.6% win rate in the loaded match history. The recent form line is 5-5 across the latest 10 completed matches.

Latest rank -

Matches21Completed matches

Win rate47.6%Across all matches

Latest form5-5In latest 10 matches

Index statusReview candidateProfile confidence

Performance metrics

Hold Base51.9%

Break Pressure36.2%

Latest form (10 matches)

5-5

W L W L W L W L W L

Surface profile

Hardcourt outdoor

Canonical/players/rira-kosaka/

Index statusReview candidate

Last updatedData from TennisJack

Profile intelligence

Ten signals worth watching.

Built from 21 completed TennisJack matches: form, surface, odds, pressure and close-set behavior. The full match log stays below for audit.

Player DNA

Quick fingerprint from starts, service base, return bite and decider exposure.

Balanced starts Break-heavy player Close-set risk

Set 1 punch42.9%

Service shield51.9%

Return bite36.2%

Decider risk38.1%

Favorite / Underdog Split

How the player behaves when priced as market favorite versus outsider.

Favorite 33.3% 1-2 - 3 matches Avg odds 1.39 | 1+ set 66.7%

Underdog 28.6% 2-5 - 7 matches Avg odds 4.23 | 1+ set 57.1%

First Set Personality

Shows whether the player starts cleanly, breaks first, or survives early pressure.

Set 1 win42.9%

Breaks first S137.5%

Broken first S162.5%

Recovers S120.0%

Break Pressure Profile

Return damage versus service leakage, built from set-level break counters.

Avg breaks3.43

Avg broken4.10

Balance-0.67

Clean service matches23.8%

3+ breaks produced52.4%

Set 2 win52.4%

Clean Win / Comeback Index

Separates smooth 2-0 wins from matches where the player had to repair damage.

40.0%Clean 2-0 share among wins

Clean 2-0 wins4

Comeback signals10

Lost set 1, won match2

Comeback index47.6%

Surface Edge

Where the profile is most trustworthy and where the win rate really travels.

Primary surfaceHardcourt outdoor

Primary record7-7

Primary WR50.0%

Best surfaceHardcourt outdoor 50.0%

Hardcourt outdoor7-750.0%

Unknown3-350.0%

Carpet indoor0-10.0%

Odds Value Pulse

Shows whether the player wins as expected or creates value at outsider prices.

Avg win odds2.47

Avg loss odds3.77

Biggest win odds4.33

2.00+ odds WR16.7%

2.00+ sample6

Odds sample10

Decider Profile

How often matches become complicated, and whether the player survives the third set.

Three-set share38.1%

Decider record4-4

Set 3 win50.0%

After losing S116.7%

Close Set Risk

Tie-break and 7-5 / 7-6 pressure profile, useful for spotting fragile edges.

Close sets11-7

Close-set WR61.1%

Tie-breaks1-1

Matches with tight set13

Momentum Trend

Compares the latest 5 matches with the previous 10 so form shifts are visible immediately.

Stable form · 1 losses running

W L W L W L W L W L

Latest 5 WR40.0%

Previous 10 WR40.0%

Latest 52-3

Previous 104-6

Trend delta+0.0%

Latest 5 WR40.0%

Match log

All Rira Kosaka matches in the TennisJack sample.

Scan date, tournament, surface, opponent, set score, result and service-return indicators before opening the deeper tools.

Open Player Research

Date	Match	Score	Result	Hold / Break
22.09.2026	Rira Kosaka vs Sayaka IshiiW50 Nanao	3-6 1-6Surface pending	Loss	Hold 37.5% Break 12.5%
21.09.2026	Rira Kosaka vs Natsuho ArakawaW50 Nanao	3-6 6-3 6-2Surface pending	Win	Hold 92.3% Break 23.1%
10.09.2026	Rira Kosaka vs Kisa YoshiokaW15 Yeongwol	2-6 7-5 3-6Surface pending	Loss	Hold 35.7% Break 46.7%
09.09.2026	Rira Kosaka vs Hee Won JuW15 Yeongwol	6-2 7-5Surface pending	Win	Hold 60.0% Break 70.0%
16.07.2026	Rira Kosaka vs Junhan ZhangW15 Luan	1-6 4-6Surface pending	Loss	Hold 62.5% Break 0.0%
14.07.2026	Rira Kosaka vs Liuyan AnW15 Luan	6-4 6-2Surface pending	Win	Hold 66.7% Break 66.7%
08.07.2026	Rira Kosaka vs Seo Yun ChoiW15 Luan	4-6 1-6Hardcourt outdoor	Loss	Hold 25.0% Break 33.3%
07.07.2026	Rira Kosaka vs Salakthip OunmuangW15 Luan	7-6 6-4Hardcourt outdoor	Win	Hold 54.5% Break 50.0%
25.06.2026	Rira Kosaka vs Ying ZhangW15 Sapporo	4-6 7-5 4-6Hardcourt outdoor	Loss	Hold 50.0% Break 43.8%
24.06.2026	Rira Kosaka vs Mutsumi UemuraW15 Sapporo	6-4 6-2Hardcourt outdoor	Win	Hold 55.6% Break 77.8%
13.05.2026	Rira Kosaka vs Gaeul JangW35 Andong	2-6 3-6Hardcourt outdoor	Loss	Hold 50.0% Break 11.1%
05.05.2026	Rira Kosaka vs Moeka MiyataW35 Fukuoka	3-6 6-7Carpet indoor	Loss	Hold 45.5% Break 36.4%
22.04.2026	Rira Kosaka vs Elena MicicW35 Miyazaki	6-2 3-6 4-6Hardcourt outdoor	Loss	Hold 53.9% Break 42.9%
16.08.2025SF	Rira Kosaka vs Shiho TsujiokaUTR Pro Yokohama Women	2-6 1-6Hardcourt outdoor	Loss	Hold - Break -
15.08.2025	Rira Kosaka vs Natsuki YamagamiUTR Pro Yokohama Women	5-7 7-5 6-4Hardcourt outdoor	Win	Hold - Break -
14.08.2025	Rira Kosaka vs Sasha Sakura StulaUTR Pro Yokohama Women	6-1 6-1Hardcourt outdoor	Win	Hold - Break -
13.08.2025	Rira Kosaka vs Junri NamigataUTR Pro Yokohama Women	6-1 6-1Hardcourt outdoor	Win	Hold - Break -
13.08.2025	Rira Kosaka vs Ran WakanaUTR Pro Yokohama Women	6-4 0-6 6-3Hardcourt outdoor	Win	Hold - Break -
22.05.2025	Rira Kosaka vs Nao NishinoITF W15 Fukui	1-6 1-5Hardcourt outdoor	Loss	Hold 28.6% Break 0.0%
21.05.2025	Rira Kosaka vs Yuno KitaharaITF W15 Fukui	7-5 0-6 6-2Hardcourt outdoor	Win	Hold 53.9% Break 46.1%
14.05.2025	Rira Kosaka vs Yuka NaitoITF W15 Toyama	1-6 6-2 2-6Hardcourt outdoor	Loss	Hold 58.3% Break 18.2%