H2H data updated: 2026-09-13 00:00 UTC
Kathy Obrien holds a 1–0 lead over Kaoru Okamoto in their WTA head-to-head. They have met 1 times in main draws. Most recently, Kathy Obrien won the 1983 Tokyo Japan Open round of 16 4-6 6-3 6-4.
Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.
| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Kathy Obrien | 4-6 6-3 6-4 | Kaoru Okamoto | Match data | Oct 21, 1983* | R16 | Tokyo Japan Open | WTA 250 | — |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kaoru Okamoto | #225 | #75 | 14 | 1,589 | 23 | 44 | 34.3% | 0 | 0 | 0 | 1 | 0 | 1 |
| Kathy Obrien | — | — | — | 1,536 | 10 | 12 | 45.5% | 0 | 0 | 0 | 0 | 1 | 1 |
Seasons are aligned by the age each player spent most of that calendar year. GS and Titles are cumulative career totals through that season.
| Kaoru Okamoto | Kathy Obrien | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles |
| 1978 | 0–1 | 0.0% | — | 1,483 | 0 | 0 | 1978 | 1–1 | 50.0% | — | 1,503 | 0 | 0 |
| 1980 | 0–2 | 0.0% | — | 1,466 | 0 | 0 | 1979 | 2–1 | 66.7% | — | 1,520 | 0 | 1 |
| 1981 | 0–3 | 0.0% | — | 1,441 | 0 | 0 | 1980 | 3–4 | 42.9% | — | 1,519 | 0 | 1 |
| 1983 | 3–2 | 60.0% | — | 1,473 | 0 | 0 | 1981 | 1–1 | 50.0% | — | 1,531 | 0 | 1 |
| 1984 | 0–1 | 0.0% | #189 | 1,465 | 0 | 0 | 1982 | 1–1 | 50.0% | — | 1,527 | 0 | 1 |
| 1985 | 0–1 | 0.0% | — | 1,449 | 0 | 0 | 1983 | 2–4 | 33.3% | — | 1,514 | 0 | 1 |
| 1986 | 2–1 | 66.7% | #151 | 1,479 | 0 | 0 | — | — | — | — | — | — | — |
| 1987 | 6–8 | 42.9% | #107 | 1,542 | 0 | 0 | — | — | — | — | — | — | — |
| 1988 | 1–8 | 11.1% | #208 | 1,495 | 0 | 0 | — | — | — | — | — | — | — |
| 1989 | 5–7 | 41.7% | #115 | 1,507 | 0 | 1 | — | — | — | — | — | — | — |
| 1990 | 3–6 | 33.3% | #165 | 1,496 | 0 | 1 | — | — | — | — | — | — | — |
| 1991 | 2–2 | 50.0% | #183 | 1,534 | 0 | 1 | — | — | — | — | — | — | — |
| 1992 | 1–2 | 33.3% | #225 | 1,535 | 0 | 1 | — | — | — | — | — | — | — |
Rows are aligned in career order because complete birth data is unavailable. 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.
| Kaoru Okamoto | Kathy Obrien | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 % | ||
| 1978 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 1979 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1980 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 1980 | 3 | 4 | 7 | 42.9% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1981 | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | 1983 | 0 | 3 | 3 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1983 | 2 | 1 | 3 | 66.7% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1984 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1986 | 2 | 1 | 3 | 66.7% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1987 | 3 | 3 | 6 | 50.0% | 0 | 1 | 1 | 0.0% | 3 | 3 | 6 | 50.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1988 | 0 | 4 | 4 | 0.0% | 0 | 1 | 1 | 0.0% | 1 | 2 | 3 | 33.3% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1989 | 5 | 2 | 7 | 71.4% | 0 | 1 | 1 | 0.0% | 0 | 3 | 3 | 0.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1990 | 3 | 2 | 5 | 60.0% | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1991 | 2 | 1 | 3 | 66.7% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1992 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | 17 | 17 | 34 | 50.0% | 0 | 6 | 6 | 0.0% | 4 | 9 | 13 | 30.8% | 1 | 9 | 10 | 10.0% | Career | 3 | 8 | 11 | 27.3% | — | — | — | — | — | — | — | — | — | — | — | — |
Rows are aligned in career order because complete birth data is unavailable. 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.
| Kaoru Okamoto | Kathy Obrien | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| 1978 | 1484 | 94.1 | — | — | — | — | — | — | — | 0.0% | -4.50 | — | — | — | +0.24 | 1978 | 1503 | 99.3 | — | — | — | — | — | — | — | 40.0% | -1.00 | 1–0 | — | — | +0.02 |
| 1980 | 1466 | 98.1 | — | — | — | — | — | — | — | 0.0% | -4.00 | — | — | — | -0.26 | 1979 | 1521 | 101.2 | — | — | — | — | — | — | — | 50.0% | +0.50 | 2–0 | 0–1 | — | +0.58 |
| 1981 | 1441 | 93.7 | — | — | — | — | +118 | — | — | 14.3% | -3.00 | 0–1 | 0–1 | — | +0.23 | 1980 | 1520 | 99.2 | — | — | — | — | +20 | — | — | 38.9% | -0.67 | 3–1 (75%) | 2–0 | — | +0.83 |
| 1983 | 1474 | 101.6 | — | — | — | — | +92 | — | — | 53.3% | 0.00 | 3–2 (60%) | 1–1 | — | +0.60 | 1981 | 1531 | 107.3 | — | — | — | — | — | — | — | 50.0% | 0.00 | — | — | — | -0.35 |
| 1984 | 1466 | 100.5 | — | — | — | — | — | — | — | 33.3% | -0.67 | 0–1 | — | — | -0.03 | 1982 | 1527 | 103.6 | — | — | — | — | — | — | — | 50.0% | +1.00 | — | — | — | +0.08 |
| 1985 | 1450 | 92.5 | — | — | — | — | — | — | — | 0.0% | -5.00 | — | — | — | +0.04 | 1983 | 1515 | 102.3 | — | — | — | — | +3 | — | — | 41.2% | -0.18 | 2–3 (40%) | 0–1 | — | +0.39 |
| 1986 | 1480 | 106.1 | — | — | — | — | +81 | — | — | 57.1% | +1.43 | 1–0 | 0–2 | — | +0.49 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1987 | 1543 | 119.7 | — | — | — | — | +26 | — | +59 | 43.3% | -0.07 | 1–1 | 0–3 (0%) | — | +0.51 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1988 | 1496 | 101.8 | — | — | — | — | -12 | — | +74 | 20.0% | -2.20 | 0–2 | — | — | -0.11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1989 | 1508 | 102.8 | — | — | — | — | +50 | — | +5 | 42.3% | -0.73 | 1–1 | 0–1 | — | +1.66 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1990 | 1496 | 100.2 | — | — | — | — | +51 | — | — | 31.6% | -1.11 | 1–0 | 0–1 | — | +0.82 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1991 | 1534 | 117.3 | — | — | — | — | +41 | — | — | 50.0% | +0.38 | — | 0–1 | — | -0.21 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1992 | 1536 | 100.8 | — | — | — | — | +39 | — | — | 28.6% | -2.00 | 1–0 | 1–1 | — | +0.29 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 2016 | 1516 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | 1590 | 107.9 | — | — | — | — | +47 | — | +49 | 36.0% | -0.97 | 8–8 (50%) | 2–11 (15%) | 94.2 | +6.37 | Career | 1536 | 103.8 | — | — | — | — | +15 | — | — | 42.9% | -0.22 | 8–4 (67%) | 2–2 (50%) | 104.3 | +7.05 |
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 |
|---|---|---|---|---|---|
| Liz Smylie | 1 | 2 | 3 | Apr 15, 1990 | H2H |
| Laura Arraya | 0 | 2 | 2 | Apr 13, 1991 | H2H |
| Catarina Lindqvist Ryan | 1 | 1 | 2 | Apr 12, 1991 | H2H |
| Betsy Nagelsen | 1 | 1 | 2 | Apr 14, 1990 | H2H |
| Belinda Cordwell | 1 | 1 | 2 | Apr 22, 1989 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Betsy Nagelsen | 0 | 1 | 1 | Oct 22, 1983 | H2H |
| Kaoru Okamoto | 1 | 0 | 1 | Oct 21, 1983 | H2H |
| Helena Manset | 1 | 0 | 1 | Oct 20, 1983 | H2H |
| Nanette Schutte | 0 | 1 | 1 | Oct 13, 1983 | H2H |
| Yvonne Vermaak | 0 | 1 | 1 | Sep 15, 1983 | H2H |