Natsuho Arakawa vs Rira KosakaPrediction, Head-to-Head Results, and Stats
Natsuho Arakawa and Rira Kosaka have met 1 time since 2026; Rira Kosaka leads 1–0. Across all meetings Arakawa has taken 1 sets to Kosaka's 2. Their most recent meeting: Rira Kosaka won at W50 Nanao (2026).
Spread & Straight-Sets Form
Completed best-of-3 matches · Last 12 months
| Indicator | Arakawa | Kosaka | ||
|---|---|---|---|---|
| Indicator | Natsuho Arakawa | Rira Kosaka | ||
| Wins in straight sets | 71% | 12/17 | 78% | 14/18 |
| Wins a set when losing | 39% | 9/23 | 47% | 9/19 |
| Goes to a deciding set | 35% | 14/40 | 35% | 13/37 |
| Covers −1.5 sets as favorite | 14% | 1/7 | 33% | 1/3 |
| Covers +1.5 sets as underdog | 55% | 11/20 | 69% | 11/16 |
| Tiebreak sets won | 75% | 6/8 | 33% | 1/3 |
| Wins after taking set 1 | 65% | 13/20 | 84% | 16/19 |
| Wins 2-0 after taking set 1 | 60% | 12/20 | 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: 0 of 1 completed meetings ended in straight sets (Arakawa 0, Kosaka 0).
Style Matchup
Playing styles and historical archetype record
Arakawa
🤖 Servebot
Kosaka
🧱 The Wall
Matchup analysis
The 🤖 Servebot archetype wins about 53% vs 🧱 The Wall across 355 matches in our dataset: a stylistic lean toward Natsuho Arakawa.
Servebot players often use high ace rate and dominant service to pressure the the wall's elite returner.
Previous meetings
1 career meeting, newest first
Sep 21, 2026
W50 Nanao
? Carpet · 1st Round Qualifying
Prop Research
Hit rates on common betting markets · Last 90 days
| Outcome | Arakawa | Kosaka | ||
|---|---|---|---|---|
| Outcome | Natsuho Arakawa | Rira Kosaka | ||
| 1 or more | 77% | 10/13 | 44% | 4/9 |
| 3 or more | 62% | 8/13 | 11% | 1/9 |
| 5 or more | 23% | 3/13 | 0% | 0/9 |
| 10 or more | 0% | 0/13 | 0% | 0/9 |
| 15 or more | 0% | 0/13 | 0% | 0/9 |
| 20 or more | 0% | 0/13 | 0% | 0/9 |
Player ROI
Hypothetical if you put 1u on each player to win every one of their matches · Last 90 days
| Metric | Arakawa | Kosaka |
|---|---|---|
| W-L | 5–8 | 3–4 |
| Avg odds | 3.59 | 4.13 |
| ROI % | +84.8% | -15.4% |
| Units P/L | +11.02u | -1.08u |
Small sample: ROI stabilizes with more matches; fewer than 10 in the window is noisy.
Travel
Last 30 days
| Metric | Arakawa | Kosaka |
|---|---|---|
| Countries | 4 | 3 |
| Events | 4 | 3 |
| Matches | 4 | 8 |
| Distance | — | — |
| Route | ESP → AUT → ECU → 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.
Common opponents
Results vs. opponents both players faced · Last 12 months
Kosaka has a higher win rate against shared opponents (60% vs Arakawa's 0%).
| Opponent | Arakawa | Kosaka |
|---|---|---|
| Remika Ohashi | L 64 36 810 | W 61 63 |
| Sayaka Ishii | L 61 16 410 | L 36 16 |
| Soo Ha Jang | L 36 63 26 | W 63 67 106 |
| Eloise Newberry | L 63 26 46 | W 62 76 |
| Moeka Miyata | L 61 36 1113 | L 36 67 |
Recent Form
Last five matches per player
Jasmine Adams
W35 Wagga Wagga · 2nd Round Qualifying
Oct 5
Nagi Hanatani
W35 Wagga Wagga · 1st Round
Sep 29
Rira Kosaka
W50 Nanao · 1st Round Qualifying
Sep 21
Remika Ohashi
W35 Kyoto · 3rd Round Qualifying
Sep 15
Karen Tsutsumi
W35 Kyoto · 1st Round Qualifying
Sep 14
Clarissa Blomqvist
W15 Monastir · 1st Round
Sep 2
Eloise Newberry
W15 Monastir · 1st Round
Aug 26
Eloise Newberry
W15 Monastir · 1st Round
Aug 26
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 · 37–41 matches
| Metric | Arakawa | Kosaka |
|---|---|---|
| Matches won | 44% | 49% |
| Sets won | 46% | 52% |
| Games won | 48% | 50% |
Record by tier
Head-to-head record by tournament tier
| Stage | Arakawa | Kosaka |
|---|---|---|
| ITF W50 | 0 | 1 |
By surface
Head-to-head record per surface
| Surface | Arakawa | Kosaka |
|---|---|---|
| Carpet | 0 | 1 |
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