Natsumi Kawaguchi vs Sayaka IshiiPrediction, Head-to-Head Results, and Stats
🇯🇵Natsumi Kawaguchi
#411 · 23 yrs · Left-Handed
3 meetings · sets 3–4
🇯🇵Sayaka Ishii
#588 · 20 yrs
Natsumi Kawaguchi and Sayaka Ishii have met 3 times since 2026; Sayaka Ishii leads 2–1. Their first meeting came at W100 Gifu in 2026 on hard. On hard courts they are level 1–1. Across all meetings Kawaguchi has taken 3 sets to Ishii's 4. Their most recent meeting: Sayaka Ishii won at W50 Nanao (2026).
Spread & Straight-Sets Form
Completed best-of-3 matches · Last 12 months
| Indicator | Kawaguchi | Ishii | ||
|---|---|---|---|---|
| Indicator | Natsumi Kawaguchi | Sayaka Ishii | ||
| Wins in straight sets | 64% | 18/28 | 65% | 17/26 |
| Wins a set when losing | 26% | 6/23 | 17% | 4/23 |
| Goes to a deciding set | 31% | 16/51 | 27% | 13/49 |
| Covers −1.5 sets as favorite | 48% | 11/23 | 32% | 8/25 |
| Covers +1.5 sets as underdog | 57% | 13/23 | 44% | 7/16 |
| Tiebreak sets won | 42% | 5/12 | 53% | 8/15 |
| Wins after taking set 1 | 85% | 22/26 | 91% | 20/22 |
| Wins 2-0 after taking set 1 | 69% | 18/26 | 77% | 17/22 |
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: 2 of 3 completed meetings ended in straight sets (Kawaguchi 1, Ishii 1).
Style Matchup
Playing styles and historical archetype record
Kawaguchi
💥 Big Hitter
Ishii
💥 Big Hitter
Matchup analysis
Both Natsumi Kawaguchi and Sayaka Ishii are 💥 Big Hitter types. Mirror matchups usually come down to execution, fitness, and surface fit, across 5,594 matches in our dataset the historical split is about even.
Previous meetings
3 career meetings, newest first
Sep 24, 2026
W50 Nanao
? Carpet · 2nd Round
May 20, 2026
W100 Takasaki
H Hard · 1st Round
Apr 27, 2026
W100 Gifu
H Hard · 1st Round Qualifying
Prop Research
Hit rates on common betting markets · Last 90 days
| Outcome | Kawaguchi | Ishii | ||
|---|---|---|---|---|
| Outcome | Natsumi Kawaguchi | Sayaka Ishii | ||
| 1 or more | 100% | 8/8 | 79% | 15/19 |
| 3 or more | 75% | 6/8 | 26% | 5/19 |
| 5 or more | 25% | 2/8 | 11% | 2/19 |
| 10 or more | 0% | 0/8 | 5% | 1/19 |
| 15 or more | 0% | 0/8 | 0% | 0/19 |
| 20 or more | 0% | 0/8 | 0% | 0/19 |
Player ROI
Hypothetical if you put 1u on each player to win every one of their matches · Last 90 days
| Metric | Kawaguchi | Ishii |
|---|---|---|
| W-L | 3–5 | 13–8 |
| Avg odds | 1.86 | 1.56 |
| ROI % | -46.9% | -12.1% |
| Units P/L | -3.75u | -2.55u |
Small sample: ROI stabilizes with more matches; fewer than 10 in the window is noisy.
Travel
Last 30 days
| Metric | Kawaguchi | Ishii |
|---|---|---|
| Countries | 3 | 2 |
| Events | 3 | 2 |
| Matches | 6 | 8 |
| Distance | — | — |
| Route | ESP → AUT → CHN | ESP → AUT |
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
Across 6 shared opponents, both Kawaguchi and Ishii posted a 50% win rate.
| Opponent | Kawaguchi | Ishii |
|---|---|---|
| Unknown Player | L 46 57 | W 60 60 |
| Rina Saigo | W 76 64 | L 36 06 |
| Hikaru Sato | L 46 67 | W 64 46 62 |
| Yuno Kitahara | L 57 64 36 | W 76 36 62 |
| Kyoka Okamura | W 63 62 | L 46 36 |
| Elena Micic | W 26 76 60 | L 36 57 |
Recent Form
Last five matches per player
Meiqi Guo
Jingshan Tennis Open - Jingshan · 1st Round Qualifying
Sep 26
Sayaka Ishii
W50 Nanao · 2nd Round
Sep 24
Kayo Nishimura
W50 Nanao · 1st Round
Sep 22
Rinko Matsuda
W35 Kyoto · Quarterfinals
Sep 18
Haruna Arakawa
W35 Kyoto · 2nd Round
Sep 17
Kayo Nishimura
W35 Kyoto · 1st Round
Sep 15
Unknown Player
W50 Guiyang · 1st Round Qualifying
Sep 6
Funa Kozaki
W75 Tianjin · 1st Round Qualifying
Aug 30
Hiromi Abe
W50 Nanao · Semifinals
Sep 26
Rion Itaya
W50 Nanao · Quarterfinals
Sep 25
Natsumi Kawaguchi
W50 Nanao · 2nd Round
Sep 24
Nagi Hanatani
W50 Nanao · 1st Round
Sep 23
Rira Kosaka
W50 Nanao · 3rd Round Qualifying
Sep 22
Miku Suzuki
W50 Nanao · 1st Round Qualifying
Sep 21
Hiromi Abe
W35 Kyoto · Quarterfinals
Sep 18
Amelia Rajecki
W35 Kyoto · 2nd Round
Sep 17
Rivalry momentum
Cumulative head-to-head lead over time
Win rate
Matches, sets and games won · Last 12 months · 49–51 matches
| Metric | Kawaguchi | Ishii |
|---|---|---|
| Matches won | 55% | 53% |
| Sets won | 53% | 50% |
| Games won | 51% | 51% |
Record by tier
Head-to-head record by tournament tier
| Stage | Kawaguchi | Ishii |
|---|---|---|
| ITF W50 | 0 | 1 |
| ITF W100 | 1 | 1 |
By surface
Head-to-head record per surface
| Surface | Kawaguchi | Ishii |
|---|---|---|
| Hard | 1 | 1 |
| Carpet | 0 | 1 |
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