Rira Kosaka: Ranking, Schedule & Stats
Rira Kosaka is a professional tennis player from Japan, born 3 June 2008. The Japanese competes on the WTA Tour.
This page tracks Rira Kosaka's upcoming schedule, latest results, recent form and surface record, with each match linking through to a detailed head-to-head and pre-match analysis. Scores update live as matches are played.
Ratings & strengths
Umpiry ratings · updated dailyRanking & projection
WTA ranking · not EloWTA · not EloBeyond today · rivals & careerBeyond today
Results
Career
More career statistics
Career serve & return
Absolute totals across the 0 matches we have on record. Green is Kosaka, grey is the same stat by the players they faced.
1st-serve points won by season
| Season | Kosaka | Opponents |
|---|---|---|
| 2026 | 55% | 57% |
| 2025 | 62% | 63% |
| Career | 56% | 58% |
Counted from the match statistics we hold, season by season — the cards above are career totals from our data provider, so the two can differ by a few tenths. Seasons with fewer than three matches on record are left out.
Career win–loss by level
| Level | W–L | Win % | Titles |
|---|---|---|---|
| ITF / Futures | 2–8 | 20% | 0 |
Challenger and ITF matches are shown in grey and are not part of the tour-level total.
Season breakdown
Wins and losses in one season, split by round reached, surface, tournament level and opponent ranking band.
2026 season · 17–16 · W–L 52% · 33 matches
Round played
| Qualifying | 11–5 (69%) |
|---|---|
| R32 | 1–4 (20%) |
| R16 | 0–1 (0%) |
Surface
| Hard | 14–13 (52%) |
|---|---|
| Hard (indoor) | 1–1 (50%) |
| Carpet | 2–2 (50%) |
Tournament level
| Challenger | 5–7 (42%) |
|---|---|
| ITF / Futures | 12–9 (57%) |
Rounds are the round each match was played in, not a ladder: a player enters a 32-draw straight in R32, and team events (United Cup, Davis Cup) are not played through a draw at all — those have their own row. Ranking bands use the opponent's ranking on match day and are cumulative: top 100 includes top 10.
Surface record by season
Each cell is one season on one surface: the number is wins–losses, the colour is the win rate. Carpet is counted as indoor hard.
| Season | Hard | Clay | Grass | I.hard | Total |
|---|---|---|---|---|---|
| 2026 | 9–14 | · | · | 2–2 | 11–16 |
| 2025 | 5–3 | · | · | · | 5–3 |
| 2024 | 2–2 | · | · | · | 2–2 |
| 2023 | 0–3 | · | · | · | 0–3 |
| Career | 16–22 42% | · | · | 2–2 50% | 18–24 43% |
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Frequently asked · Rira KosakaFrequently asked
When was Rira Kosaka born?
Rira Kosaka was born on 3 June 2008 (18 years old).
Where is Rira Kosaka from?
Rira Kosaka is from Japan.
Cite this
Rira Kosaka is ranked No. 1439 in the WTA singles rankings with 5 points. Umpiry, "Rira Kosaka: Ranking, Schedule & Stats", https://umpiry.com/players/rira-kosaka-jpn?utm_source=cite (as of 7 October 2026).