Haruka Kaji vs Rira KosakaPrediction, Head-to-Head Results, and Stats
Haruka Kaji and Rira Kosaka have met 1 time since 2026; Haruka Kaji leads 1–0. Across all meetings Kaji has taken 2 sets to Kosaka's 0. Their most recent meeting: Haruka Kaji won at W35 Wagga Wagga (2026).
Spread & Straight-Sets Form
Completed best-of-3 matches · Last 12 months
| Indicator | Kaji | Kosaka | ||
|---|---|---|---|---|
| Indicator | Haruka Kaji | Rira Kosaka | ||
| Wins in straight sets | 75% | 24/32 | 78% | 14/18 |
| Wins a set when losing | 22% | 7/32 | 47% | 9/19 |
| Goes to a deciding set | 23% | 15/64 | 35% | 13/37 |
| Covers −1.5 sets as favorite | 59% | 13/22 | 33% | 1/3 |
| Covers +1.5 sets as underdog | 49% | 19/39 | 69% | 11/16 |
| Tiebreak sets won | 67% | 10/15 | 33% | 1/3 |
| Wins after taking set 1 | 86% | 24/28 | 84% | 16/19 |
| Wins 2-0 after taking set 1 | 86% | 24/28 | 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. Head-to-head: 1 of 1 completed meetings ended in straight sets (Kaji 1, Kosaka 0).
Style Matchup
Playing styles and historical archetype record
Kaji
⚔️ The Gladiator
Kosaka
🧱 The Wall
Matchup analysis
The ⚔️ The Gladiator archetype wins about 60% vs 🧱 The Wall across 1,508 matches in our dataset: a stylistic lean toward Haruka Kaji.
The Gladiator players often use physical intensity and balanced game to pressure the the wall's elite returner.
Previous meetings
1 career meeting, newest first
Oct 7, 2026
W35 Wagga Wagga
H Hard · 1st Round
Prop Research
Hit rates on common betting markets · Last 90 days
| Outcome | Kaji | Kosaka | ||
|---|---|---|---|---|
| Outcome | Haruka Kaji | Rira Kosaka | ||
| 1 or more | 33% | 5/15 | 44% | 4/9 |
| 3 or more | 7% | 1/15 | 11% | 1/9 |
| 5 or more | 7% | 1/15 | 0% | 0/9 |
| 10 or more | 0% | 0/15 | 0% | 0/9 |
| 15 or more | 0% | 0/15 | 0% | 0/9 |
| 20 or more | 0% | 0/15 | 0% | 0/9 |
Player ROI
Hypothetical if you put 1u on each player to win every one of their matches · Last 90 days
| Metric | Kaji | Kosaka |
|---|---|---|
| W-L | 7–9 | 3–4 |
| Avg odds | 2.27 | 4.13 |
| ROI % | -32.1% | -15.4% |
| Units P/L | -5.13u | -1.08u |
Small sample: ROI stabilizes with more matches; fewer than 10 in the window is noisy.
Travel
Last 30 days
| Metric | Kaji | Kosaka |
|---|---|---|
| Countries | 2 | 3 |
| Events | 3 | 3 |
| Matches | 5 | 8 |
| Distance | — | — |
| Route | POR → CHN → POR | 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
Naho Sato
W35 Wagga Wagga · Quarterfinals
Oct 9
Rira Kosaka
W35 Wagga Wagga · 1st Round
Oct 7
Jasmine Adams
W35 Wagga Wagga · 2nd Round
Oct 7
Emerson Jones
Jingshan Tennis Open - Jingshan · 1st Round
Sep 28
Darya Astakhova
Korea Open - Seoul · 1st Round Qualifying
Sep 19
Alexandra Shubladze
W50 Guiyang · 2nd Round
Sep 10
Anastasia Kulikova
W50 Guiyang · 1st Round
Sep 8
Han Shi
W75 Tianjin · 2nd Round
Sep 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 · 37–64 matches
| Metric | Kaji | Kosaka |
|---|---|---|
| Matches won | 50% | 49% |
| Sets won | 50% | 52% |
| Games won | 50% | 50% |
Record by tier
Head-to-head record by tournament tier
| Stage | Kaji | Kosaka |
|---|---|---|
| ITF W35 | 1 | 0 |
By surface
Head-to-head record per surface
| Surface | Kaji | Kosaka |
|---|---|---|
| Hard | 1 | 0 |
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