H2H data updated: 2026-09-14 00:00 UTC
Petra Kamstra and Naoko Sawamatsu are tied 1–1 in their WTA head-to-head. Across 2 main-draw meetings, Petra Kamstra leads 1–0 on grass, while Naoko Sawamatsu leads 1–0 on hard courts. Most recently, Petra Kamstra won the 1995 Wimbledon round of 32 6-1 7-6.
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| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Petra Kamstra | 6-1 7-6 | Naoko Sawamatsu | Match data | Jul 2, 1995* | R32 | Wimbledon | Grand Slam | Grass |
| Naoko Sawamatsu | 4-6 5-0 (ret.) | Petra Kamstra | Match data | Apr 19, 1991* | R16 | Pattaya | Tier V → modern equivalent WTA 250 | Hard |
Estimated match date where the exact historical date is unavailable. Arrows show an edition's recorded category and documented modern equivalent; unresolved editions keep their recorded category. Asterisked totals include editions mapped from documented historical predecessor categories. Mapping details.
| Player | Current | Peak | Pts | Elo | W | L | Win % | GS | 1000 including documented historical predecessor categories | Finals | 500 including documented historical predecessor categories | 250 including documented historical predecessor categories | Titles |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Petra Kamstra | #425 | #70 | 90 | 1,585 | 21 | 36 | 36.8% | 0 | 0 | 0 | 0 | 0 | 0 |
| Naoko Sawamatsu | #266 | #14 | 881 | 1,970 | 183 | 129 | 58.7% | 0 | 0 | 0 | 0 | 4 | 4 |
Seasons are aligned by the age each player spent most of that calendar year. GS and Titles are cumulative career totals through that season.
| Age | Petra Kamstra | Naoko Sawamatsu | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 16 | 1990 | 0–1 | 0.0% | #198 | 1,485 | 0 | 0 | 1989 | 0–2 | 0.0% | #262 | 1,477 | 0 | 0 |
| 17 | 1991 | 6–8 | 42.9% | #128 | 1,531 | 0 | 0 | 1990 | 14–6 | 70.0% | #31 | 1,669 | 0 | 1 |
| 18 | 1992 | 0–4 | 0.0% | #280 | 1,482 | 0 | 0 | 1991 | 21–16 | 56.8% | #33 | 1,723 | 0 | 1 |
| 19 | 1993 | 0–1 | 0.0% | #178 | 1,478 | 0 | 0 | 1992 | 23–13 | 63.9% | #24 | 1,856 | 0 | 1 |
| 20 | 1994 | 4–9 | 30.8% | #158 | 1,476 | 0 | 0 | 1993 | 24–13 | 64.9% | #28 | 1,853 | 0 | 2 |
| 21 | 1995 | 7–5 | 58.3% | #76 | 1,576 | 0 | 0 | 1994 | 24–12 | 66.7% | #26 | 1,870 | 0 | 3 |
| 22 | 1996 | 4–8 | 33.3% | #203 | 1,567 | 0 | 0 | 1995 | 22–13 | 62.9% | #17 | 1,847 | 0 | 3 |
| 23 | — | — | — | — | — | — | — | 1996 | 19–17 | 52.8% | #38 | 1,811 | 0 | 3 |
| 24 | — | — | — | — | — | — | — | 1997 | 24–19 | 55.8% | #34 | 1,849 | 0 | 4 |
| 25 | — | — | — | — | — | — | — | 1998 | 12–18 | 40.0% | #55 | 1,721 | 0 | 4 |
Seasons are aligned by the age each player spent most of that calendar year. Results cover completed main-draw matches. Bold green marks the higher win percentage when both players have at least 5 matches on that surface at the aligned age.
| Age | Petra Kamstra | Naoko Sawamatsu | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Hard | Clay | Grass | Carpet | Yr | Hard | Clay | Grass | Carpet | |||||||||||||||||||||||||
| W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | |||
| 16 | 1990 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 1989 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 17 | 1991 | 6 | 6 | 12 | 50.0% | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | 1990 | 13 | 3 | 16 | 81.3% | 1 | 1 | 2 | 50.0% | 0 | 2 | 2 | 0.0% | — | — | — | — |
| 18 | 1992 | 0 | 3 | 3 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | 1991 | 13 | 10 | 23 | 56.5% | 7 | 3 | 10 | 70.0% | 1 | 2 | 3 | 33.3% | 0 | 1 | 1 | 0.0% |
| 19 | 1993 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | 1992 | 13 | 7 | 20 | 65.0% | 5 | 4 | 9 | 55.6% | 3 | 1 | 4 | 75.0% | 2 | 1 | 3 | 66.7% |
| 20 | 1994 | 3 | 6 | 9 | 33.3% | 0 | 1 | 1 | 0.0% | 1 | 1 | 2 | 50.0% | 0 | 1 | 1 | 0.0% | 1993 | 12 | 8 | 20 | 60.0% | 7 | 2 | 9 | 77.8% | 4 | 2 | 6 | 66.7% | 1 | 1 | 2 | 50.0% |
| 21 | 1995 | 3 | 3 | 6 | 50.0% | — | — | — | — | 4 | 2 | 6 | 66.7% | — | — | — | — | 1994 | 15 | 7 | 22 | 68.2% | 5 | 3 | 8 | 62.5% | 4 | 2 | 6 | 66.7% | — | — | — | — |
| 22 | 1996 | 0 | 2 | 2 | 0.0% | 2 | 3 | 5 | 40.0% | 2 | 3 | 5 | 40.0% | — | — | — | — | 1995 | 14 | 8 | 22 | 63.6% | 4 | 3 | 7 | 57.1% | 2 | 1 | 3 | 66.7% | 2 | 1 | 3 | 66.7% |
| 23 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1996 | 11 | 11 | 22 | 50.0% | 4 | 3 | 7 | 57.1% | 2 | 2 | 4 | 50.0% | 2 | 1 | 3 | 66.7% |
| 24 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1997 | 20 | 12 | 32 | 62.5% | 0 | 3 | 3 | 0.0% | 2 | 2 | 4 | 50.0% | 2 | 2 | 4 | 50.0% |
| 25 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1998 | 6 | 10 | 16 | 37.5% | 3 | 5 | 8 | 37.5% | 2 | 2 | 4 | 50.0% | 1 | 1 | 2 | 50.0% |
| Career | — | 12 | 21 | 33 | 36.4% | 2 | 6 | 8 | 25.0% | 7 | 7 | 14 | 50.0% | 0 | 2 | 2 | 0.0% | — | 117 | 77 | 194 | 60.3% | 36 | 27 | 63 | 57.1% | 20 | 16 | 36 | 55.6% | 10 | 9 | 19 | 52.6% |
Seasons are aligned by the age each player spent most of that calendar year. Metrics use eligible main-draw results; point statistics use matches with detailed data. Bold green marks the stronger value when both underlying samples are sufficient. Lower is better for Schedule because a negative value means a tougher schedule. Career Schedule is normalized per 100 matches.
| Age | Petra Kamstra | Naoko Sawamatsu | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Elo | P+ | Serve+ | Return+ | PD | TPW% | Hard Elo | Clay Elo | Grass Elo | Set Win % | Set Margin | Dec. Set | Tiebreak | Pressure+ | Schedule | Yr | Elo | P+ | Serve+ | Return+ | PD | TPW% | Hard Elo | Clay Elo | Grass Elo | Set Win % | Set Margin | Dec. Set | Tiebreak | Pressure+ | Schedule | |
| 16 | 1990 | 1486 | 99.4 | — | — | — | — | — | — | — | 33.3% | -1.33 | 0–1 | 1–0 | — | +0.05 | 1989 | 1477 | 96.0 | — | — | — | — | — | — | — | 20.0% | -2.20 | 0–1 | — | — | +0.30 |
| 17 | 1991 | 1532 | 112.2 | — | — | — | — | +51 | — | — | 46.2% | -0.38 | 2–0 | 1–0 | — | +0.26 | 1990 | 1669 | 124.7 | — | — | — | — | +57 | — | — | 62.5% | +0.77 | 6–2 (75%) | 5–1 (83%) | 110.2 | +1.75 |
| 18 | 1992 | 1482 | 94.9 | — | — | — | — | +42 | — | — | 11.1% | -2.89 | 0–1 | — | — | +0.35 | 1991 | 1724 | 133.2 | — | — | — | — | -8 | -44 | -170 | 55.4% | +0.49 | 5–6 (45%) | 1–1 | — | +2.14 |
| 19 | 1993 | 1479 | 106.2 | — | — | — | — | — | — | — | 0.0% | -1.50 | — | 0–1 | — | -0.11 | 1992 | 1857 | 143.8 | — | — | — | — | -17 | -155 | -248 | 60.7% | +0.42 | 7–5 (58%) | 4–2 (67%) | 104.0 | -0.25 |
| 20 | 1994 | 1477 | 112.2 | — | — | — | — | +24 | — | — | 35.5% | -1.10 | 2–3 (40%) | 1–1 | — | +0.20 | 1993 | 1853 | 139.0 | — | — | — | — | -68 | -33 | -152 | 62.1% | +0.86 | 7–6 (54%) | 2–0 | — | +0.17 |
| 21 | 1995 | 1577 | 124.1 | — | — | — | — | -50 | — | +68 | 55.6% | +0.70 | 2–1 (67%) | 2–1 (67%) | 103.4 | +0.11 | 1994 | 1871 | 146.2 | — | — | — | — | -20 | -58 | -130 | 60.7% | +1.00 | 9–3 (75%) | 4–3 (57%) | 106.5 | -0.99 |
| 22 | 1996 | 1567 | 112.2 | — | — | — | — | — | -43 | +134 | 44.0% | -0.48 | 0–3 (0%) | 1–1 | — | +0.39 | 1995 | 1848 | 150.6 | — | — | — | — | +59 | -74 | -92 | 58.6% | +0.48 | 10–7 (59%) | 6–3 (67%) | 103.1 | +1.09 |
| 23 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1996 | 1812 | 145.0 | — | — | — | — | +5 | +4 | -6 | 53.2% | +0.02 | 5–6 (45%) | 3–2 (60%) | 97.8 | -0.27 |
| 24 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1997 | 1850 | 153.6 | — | — | — | — | +44 | -92 | -62 | 54.0% | +0.35 | 10–6 (63%) | 5–5 (50%) | 103.9 | -1.59 |
| 25 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1998 | 1721 | 125.2 | — | — | — | — | +37 | -25 | +64 | 40.5% | -0.62 | 8–6 (57%) | 1–1 | — | -0.88 |
| Career | — | 1585 | 117.9 | — | — | — | — | +23 | -43 | +98 | 41.5% | -0.57 | 6–9 (40%) | 6–4 (60%) | 101.5 | +2.23 | — | 1971 | 148.7 | — | — | — | — | +11 | -58 | -103 | 56.1% | +0.40 | 67–48 (58%) | 31–18 (63%) | 109.3 | +0.47 |
Each player's five most-played main-draw opponents. The current matchup is highlighted when it appears in a player's top five.
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Judith Wiesner | 0 | 2 | 2 | Jun 21, 1996 | H2H |
| Brenda Schultz-Mccarthy | 0 | 2 | 2 | Jun 13, 1996 | H2H |
| Laura Golarsa | 2 | 0 | 2 | Jun 12, 1996 | H2H |
| Ann Grossman | 1 | 1 | 2 | Apr 12, 1996 | H2H |
| Naoko Sawamatsu | 1 | 1 | 2 | Jul 2, 1995 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Monica Seles | 0 | 10 | 10 | Sep 25, 1998 | H2H |
| Kimiko Date | 3 | 5 | 8 | Feb 2, 1996 | H2H |
| Silvia Farina Elia | 4 | 2 | 6 | May 13, 1998 | H2H |
| Mary Joe Fernandez | 3 | 3 | 6 | Oct 10, 1997 | H2H |
| Arantxa Sanchez-Vicario | 0 | 6 | 6 | Aug 7, 1997 | H2H |