Hee Won Ju vs Rira KosakaPrediction, Head-to-Head Results, and Stats
Hee Won Ju and Rira Kosaka have met 1 time since 2026; Rira Kosaka leads 1–0. Across all meetings Ju has taken 0 sets to Kosaka's 2. Their most recent meeting: Rira Kosaka won at W15 Yeongwol (2026).
Spread & Straight-Sets Form
Completed best-of-3 matches · Last 12 months
| Indicator | Won Ju | Kosaka | ||
|---|---|---|---|---|
| Indicator | Hee Won Ju | Rira Kosaka | ||
| Wins in straight sets | 100% | 1/1 | 78% | 14/18 |
| Wins a set when losing | 33% | 1/3 | 47% | 9/19 |
| Goes to a deciding set | 25% | 1/4 | 35% | 13/37 |
| Covers −1.5 sets as favorite | — | 33% | 1/3 | |
| Covers +1.5 sets as underdog | — | 69% | 11/16 | |
| Tiebreak sets won | — | 33% | 1/3 | |
| Wins after taking set 1 | 50% | 1/2 | 84% | 16/19 |
| Wins 2-0 after taking set 1 | 50% | 1/2 | 74% | 14/19 |
Colored rows are higher-is-better: green above 50%, red below. Favorite/underdog set by book odds; cover rows count only matches with odds on record. Small sample — read with care. Head-to-head: 1 of 1 completed meetings ended in straight sets (Won Ju 0, Kosaka 1).
Previous meetings
1 career meeting, newest first
Sep 9, 2026
W15 Yeongwol
H Hard · 1st Round
Player ROI
Hypothetical if you put 1u on each player to win every one of their matches · Last 90 days
| Metric | Ju | Kosaka |
|---|---|---|
| W-L | - | 3–4 |
| Avg odds | - | 4.13 |
| ROI % | - | -15.4% |
| Units P/L | - | -1.08u |
Small sample: ROI stabilizes with more matches; fewer than 10 in the window is noisy.
Travel
Last 30 days
| Metric | Ju | Kosaka |
|---|---|---|
| Countries | — | 3 |
| Events | — | 3 |
| Matches | — | 8 |
| Distance | — | — |
| Route | — | AUT → ECU → POR |
Host country from each tournament in the last 30 days, including the current event even when a player arrived on a bye. Route is the order of countries visited; consecutive stops in the same country are shown once. Distance is the great-circle total between host cities, shown only when every stop in the window is geocoded. A rough fatigue signal, not a headline stat.
Recent Form
Last five matches per player
Rira Kosaka
W15 Yeongwol · 1st Round
Sep 9
Han Hyeongju
W15 Yeongwol · 1st Round Qualifying
Aug 30
Mi Jeong Kwon
W35 Changwon · 2nd Round Qualifying
May 4
Ashleigh Harvey
W35 Changwon · 1st Round Qualifying
May 3
Haruka Kaji
W35 Wagga Wagga · 1st Round
Oct 7
Zoe Theodorakopoulos
W35 Wagga Wagga · 2nd Round Qualifying
Oct 5
Sera Nishimoto
W35 Wagga Wagga · 3rd Round Qualifying
Oct 5
Haruna Arakawa
W35 Wagga Wagga · 1st Round
Sep 30
Remika Ohashi
W35 Wagga Wagga · 3rd Round Qualifying
Sep 29
Shante Lai
W35 Wagga Wagga · 2nd Round Qualifying
Sep 28
Sayaka Ishii
W50 Nanao · 3rd Round Qualifying
Sep 22
Natsuho Arakawa
W50 Nanao · 1st Round Qualifying
Sep 21
Win rate
Matches, sets and games won · Last 12 months · 4–37 matches
| Metric | Ju | Kosaka |
|---|---|---|
| Matches won | 25% | 49% |
| Sets won | 33% | 52% |
| Games won | 44% | 50% |
Record by tier
Head-to-head record by tournament tier
| Stage | Ju | Kosaka |
|---|---|---|
| ITF W15 | 0 | 1 |
By surface
Head-to-head record per surface
| Surface | Ju | Kosaka |
|---|---|---|
| Hard | 0 | 1 |
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