H2H data updated: 2026-10-28 00:00 UTC
Yvonne Vermaak holds a 1–0 lead over Kathy Obrien in their WTA head-to-head. Across 1 main-draw meeting, Yvonne Vermaak leads 1–0 on hard courts. Most recently, Yvonne Vermaak won the 1983 Salt Lake City round of 32 7-5 6-3.
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 |
|---|---|---|---|---|---|---|---|---|
| Yvonne Vermaak | 7-5 6-3 | Kathy Obrien | Match data | Sep 15, 1983* | R32 | Salt Lake City | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yvonne Vermaak | — | #38 | 10 | 1,892 | 239 | 250 | 48.9% | 0 | 0 | 0 | 0 | 5 | 5 |
| Kathy Obrien | — | — | — | 1,526 | 10 | 13 | 43.5% | 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.
| Yvonne Vermaak | Kathy Obrien | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles |
| 1973 | 0–2 | 0.0% | — | 1,495 | 0 | 0 | 1978 | 1–2 | 33.3% | — | 1,489 | 0 | 0 |
| 1974 | 1–2 | 33.3% | — | 1,489 | 0 | 0 | 1979 | 2–1 | 66.7% | — | 1,508 | 0 | 1 |
| 1975 | 15–12 | 55.6% | — | 1,599 | 0 | 0 | 1980 | 3–4 | 42.9% | — | 1,510 | 0 | 1 |
| 1976 | 8–10 | 44.4% | — | 1,606 | 0 | 1 | 1981 | 1–1 | 50.0% | — | 1,522 | 0 | 1 |
| 1977 | 20–14 | 58.8% | — | 1,765 | 0 | 2 | 1982 | 1–1 | 50.0% | — | 1,519 | 0 | 1 |
| 1978 | 29–23 | 55.8% | — | 1,794 | 0 | 2 | 1983 | 2–4 | 33.3% | — | 1,509 | 0 | 1 |
| 1979 | 15–23 | 39.5% | — | 1,781 | 0 | 2 | — | — | — | — | — | — | — |
| 1980 | 19–19 | 50.0% | — | 1,735 | 0 | 2 | — | — | — | — | — | — | — |
| 1981 | 19–28 | 40.4% | — | 1,720 | 0 | 2 | — | — | — | — | — | — | — |
| 1982 | 36–27 | 57.1% | — | 1,821 | 0 | 2 | — | — | — | — | — | — | — |
| 1983 | 33–26 | 55.9% | — | 1,755 | 0 | 4 | — | — | — | — | — | — | — |
| 1984 | 29–28 | 50.9% | #41 | 1,801 | 0 | 5 | — | — | — | — | — | — | — |
| 1985 | 8–21 | 27.6% | — | 1,605 | 0 | 5 | — | — | — | — | — | — | — |
| 1986 | 6–11 | 35.3% | #104 | 1,565 | 0 | 5 | — | — | — | — | — | — | — |
| 1987 | 1–3 | 25.0% | #201 | 1,558 | 0 | 5 | — | — | — | — | — | — | — |
| 1988 | 0–1 | 0.0% | #287 | 1,542 | 0 | 5 | — | — | — | — | — | — | — |
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.
| Yvonne Vermaak | 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 % | ||
| 1973 | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | 1978 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1974 | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | — | — | — | — | 1979 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1975 | 4 | 3 | 7 | 57.1% | 7 | 4 | 11 | 63.6% | 3 | 4 | 7 | 42.9% | — | — | — | — | 1980 | 3 | 4 | 7 | 42.9% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1976 | 1 | 1 | 2 | 50.0% | 7 | 6 | 13 | 53.8% | 0 | 2 | 2 | 0.0% | 0 | 1 | 1 | 0.0% | 1983 | 0 | 3 | 3 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1977 | 3 | 2 | 5 | 60.0% | 6 | 7 | 13 | 46.2% | 8 | 2 | 10 | 80.0% | 3 | 3 | 6 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1978 | 13 | 7 | 20 | 65.0% | 2 | 2 | 4 | 50.0% | 8 | 4 | 12 | 66.7% | 6 | 10 | 16 | 37.5% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1979 | 4 | 6 | 10 | 40.0% | 4 | 4 | 8 | 50.0% | 5 | 4 | 9 | 55.6% | 2 | 9 | 11 | 18.2% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1980 | 2 | 5 | 7 | 28.6% | 9 | 5 | 14 | 64.3% | 4 | 4 | 8 | 50.0% | 4 | 5 | 9 | 44.4% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1981 | 7 | 9 | 16 | 43.8% | 11 | 9 | 20 | 55.0% | 0 | 1 | 1 | 0.0% | 1 | 9 | 10 | 10.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1982 | 4 | 4 | 8 | 50.0% | 13 | 7 | 20 | 65.0% | 9 | 6 | 15 | 60.0% | 10 | 10 | 20 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1983 | 14 | 4 | 18 | 77.8% | 7 | 8 | 15 | 46.7% | 8 | 5 | 13 | 61.5% | 4 | 9 | 13 | 30.8% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1984 | 12 | 7 | 19 | 63.2% | 7 | 8 | 15 | 46.7% | 8 | 6 | 14 | 57.1% | 2 | 7 | 9 | 22.2% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1985 | 5 | 8 | 13 | 38.5% | 1 | 4 | 5 | 20.0% | 1 | 3 | 4 | 25.0% | 1 | 6 | 7 | 14.3% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1986 | 1 | 2 | 3 | 33.3% | 4 | 6 | 10 | 40.0% | 1 | 3 | 4 | 25.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1987 | 1 | 1 | 2 | 50.0% | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1988 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | 72 | 64 | 136 | 52.9% | 78 | 72 | 150 | 52.0% | 55 | 44 | 99 | 55.6% | 33 | 69 | 102 | 32.4% | Career | 3 | 9 | 12 | 25.0% | — | — | — | — | — | — | — | — | — | — | — | — |
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.
| Yvonne Vermaak | 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 |
| 1973 | 1496 | 101.8 | — | — | — | — | — | — | — | 20.0% | -3.20 | 0–1 | — | — | -0.39 | 1978 | 1489 | 94.3 | — | — | — | — | — | — | — | 28.6% | -2.00 | 1–0 | — | — | +0.28 |
| 1974 | 1489 | 99.2 | — | — | — | — | +43 | — | — | 42.9% | -0.71 | 0–1 | — | — | +0.69 | 1979 | 1509 | 101.2 | — | — | — | — | — | — | — | 50.0% | +0.50 | 2–0 | 0–1 | — | +0.57 |
| 1975 | 1599 | 120.1 | — | — | — | — | +53 | -2 | -47 | 57.1% | +0.46 | 3–6 (33%) | 3–0 (100%) | 100.2 | +2.23 | 1980 | 1511 | 99.2 | — | — | — | — | +15 | — | — | 38.9% | -0.67 | 3–1 (75%) | 2–0 | — | +0.83 |
| 1976 | 1607 | 119.9 | — | — | — | — | -10 | +39 | — | 48.8% | +0.09 | 2–5 (29%) | 1–3 (25%) | — | +0.77 | 1981 | 1523 | 107.3 | — | — | — | — | — | — | — | 50.0% | 0.00 | — | — | — | -0.34 |
| 1977 | 1766 | 138.3 | — | — | — | — | -80 | -80 | -75 | 58.1% | +0.41 | 3–3 (50%) | 6–5 (55%) | 102.5 | -0.04 | 1982 | 1520 | 103.6 | — | — | — | — | — | — | — | 50.0% | +1.00 | — | — | — | +0.08 |
| 1978 | 1794 | 135.9 | — | — | — | — | +3 | -135 | -32 | 52.6% | +0.33 | 8–6 (57%) | 2–6 (25%) | 99.2 | +2.36 | 1983 | 1509 | 102.4 | — | — | — | — | -4 | — | — | 41.2% | -0.18 | 2–3 (40%) | 0–1 | — | +0.39 |
| 1979 | 1781 | 155.4 | — | — | — | — | -43 | -75 | +23 | 40.5% | -0.50 | 4–4 (50%) | 1–2 (33%) | 99.0 | -4.15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1980 | 1735 | 137.1 | — | — | — | — | -93 | +40 | +57 | 51.2% | +0.13 | 2–4 (33%) | 4–3 (57%) | 99.6 | -4.28 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1981 | 1720 | 144.0 | — | — | — | — | -67 | +97 | — | 43.1% | -0.39 | 4–6 (40%) | 1–5 (17%) | 97.0 | -2.56 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1982 | 1821 | 143.1 | — | — | — | — | -78 | +69 | -9 | 55.2% | +0.06 | 11–10 (52%) | 9–10 (47%) | 99.9 | -2.99 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1983 | 1755 | 138.2 | — | — | — | — | +8 | +105 | +98 | 55.4% | +0.20 | 10–11 (48%) | 7–3 (70%) | 100.1 | +1.01 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1984 | 1801 | 135.0 | — | — | — | — | -65 | -14 | +95 | 53.1% | +0.15 | 5–11 (31%) | 7–8 (47%) | 94.0 | -0.27 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1985 | 1605 | 125.4 | — | — | — | — | +12 | +115 | +210 | 37.7% | -0.97 | 1–10 (9%) | 0–1 | — | -0.88 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1986 | 1566 | 105.2 | — | — | — | — | +20 | +85 | +195 | 36.8% | -0.87 | 2–2 (50%) | 0–1 | — | -0.31 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1987 | 1559 | 108.1 | — | — | — | — | — | — | — | 25.0% | -2.38 | — | — | — | -0.55 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1988 | 1542 | 94.0 | — | — | — | — | — | — | — | 0.0% | -4.00 | — | — | — | +0.11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | 1893 | 142.0 | — | — | — | — | -34 | +34 | +34 | 50.0% | -0.06 | 55–80 (41%) | 41–47 (47%) | 93.2 | -1.90 | Career | 1526 | 102.3 | — | — | — | — | +9 | — | — | 41.4% | -0.36 | 8–4 (67%) | 2–2 (50%) | 104.6 | +7.87 |
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 |
|---|---|---|---|---|---|
| Martina Navratilova | 0 | 14 | 14 | Jan 25, 1985 | H2H |
| Chris Evert | 0 | 11 | 11 | Feb 3, 1983 | H2H |
| Virginia Ruzici | 3 | 6 | 9 | Jun 29, 1983 | H2H |
| Wendy Turnbull | 1 | 6 | 7 | Feb 24, 1987 | H2H |
| Dianne Fromholtz | 2 | 5 | 7 | Jun 25, 1986 | 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 |