H2H data updated: 2026-09-13 00:00 UTC
Yvonne Vermaak holds a 1–0 lead over Donna Ganz in their WTA head-to-head. Across 1 main-draw meeting, Yvonne Vermaak leads 1–0 on grass. Most recently, Yvonne Vermaak won the 1978 Wimbledon round of 128 6-1 6-4.
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| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Yvonne Vermaak | 6-1 6-4 | Donna Ganz | Match data | Jun 28, 1978* | R128 | Wimbledon | Grand Slam | Grass |
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 | #558 | #38 | 10 | 1,892 | 239 | 249 | 49.0% | 0 | 0 | 0 | 0 | 5 | 5 |
| Donna Ganz | — | — | — | 1,744 | 42 | 52 | 44.7% | 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 | Donna Ganz | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 1970 | 0–1 | 0.0% | — | 1,483 | 0 | 0 |
| 1974 | 1–2 | 33.3% | — | 1,489 | 0 | 0 | 1971 | 1–1 | 50.0% | — | 1,493 | 0 | 0 |
| 1975 | 15–12 | 55.6% | — | 1,599 | 0 | 0 | 1972 | 1–3 | 25.0% | — | 1,471 | 0 | 0 |
| 1976 | 8–10 | 44.4% | — | 1,606 | 0 | 1 | 1973 | 3–4 | 42.9% | — | 1,504 | 0 | 0 |
| 1977 | 20–14 | 58.8% | — | 1,765 | 0 | 2 | 1974 | 12–16 | 42.9% | — | 1,561 | 0 | 0 |
| 1978 | 29–23 | 55.8% | — | 1,791 | 0 | 2 | 1975 | 17–12 | 58.6% | — | 1,720 | 0 | 1 |
| 1979 | 15–23 | 39.5% | — | 1,779 | 0 | 2 | 1976 | 0–4 | 0.0% | — | 1,680 | 0 | 1 |
| 1980 | 19–18 | 51.4% | — | 1,741 | 0 | 2 | 1977 | 6–5 | 54.5% | — | 1,669 | 0 | 1 |
| 1981 | 19–28 | 40.4% | — | 1,719 | 0 | 2 | 1978 | 1–4 | 20.0% | — | 1,646 | 0 | 1 |
| 1982 | 36–27 | 57.1% | — | 1,820 | 0 | 2 | 1980 | 1–2 | 33.3% | — | 1,615 | 0 | 1 |
| 1983 | 33–26 | 55.9% | — | 1,754 | 0 | 4 | — | — | — | — | — | — | — |
| 1984 | 29–28 | 50.9% | #41 | 1,800 | 0 | 5 | — | — | — | — | — | — | — |
| 1985 | 8–21 | 27.6% | #41 | 1,604 | 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 | 1,541 | 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 | Donna Ganz | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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% | — | — | — | — | — | — | — | — | — | — | — | — | 1970 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 1974 | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | — | — | — | — | 1971 | — | — | — | — | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — |
| 1975 | 4 | 3 | 7 | 57.1% | 7 | 4 | 11 | 63.6% | 3 | 4 | 7 | 42.9% | — | — | — | — | 1972 | — | — | — | — | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — |
| 1976 | 1 | 1 | 2 | 50.0% | 7 | 6 | 13 | 53.8% | 0 | 2 | 2 | 0.0% | 0 | 1 | 1 | 0.0% | 1973 | — | — | — | — | 3 | 4 | 7 | 42.9% | — | — | — | — | — | — | — | — |
| 1977 | 3 | 2 | 5 | 60.0% | 6 | 7 | 13 | 46.2% | 8 | 2 | 10 | 80.0% | 3 | 3 | 6 | 50.0% | 1974 | 0 | 2 | 2 | 0.0% | 7 | 9 | 16 | 43.8% | 2 | 2 | 4 | 50.0% | 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% | 1975 | 0 | 1 | 1 | 0.0% | 17 | 8 | 25 | 68.0% | 0 | 1 | 1 | 0.0% | 0 | 2 | 2 | 0.0% |
| 1979 | 4 | 6 | 10 | 40.0% | 4 | 4 | 8 | 50.0% | 5 | 4 | 9 | 55.6% | 2 | 9 | 11 | 18.2% | 1976 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 0 | 3 | 3 | 0.0% |
| 1980 | 2 | 5 | 7 | 28.6% | 9 | 5 | 14 | 64.3% | 4 | 4 | 8 | 50.0% | 4 | 4 | 8 | 50.0% | 1977 | — | — | — | — | 1 | 3 | 4 | 25.0% | — | — | — | — | — | — | — | — |
| 1981 | 7 | 9 | 16 | 43.8% | 11 | 9 | 20 | 55.0% | 0 | 1 | 1 | 0.0% | 1 | 9 | 10 | 10.0% | 1978 | 1 | 1 | 2 | 50.0% | 0 | 2 | 2 | 0.0% | 0 | 1 | 1 | 0.0% | — | — | — | — |
| 1982 | 4 | 4 | 8 | 50.0% | 13 | 7 | 20 | 65.0% | 9 | 6 | 15 | 60.0% | 10 | 10 | 20 | 50.0% | 1980 | 1 | 1 | 2 | 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 | 68 | 101 | 32.7% | Career | 2 | 6 | 8 | 25.0% | 30 | 30 | 60 | 50.0% | 2 | 4 | 6 | 33.3% | 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.
| Yvonne Vermaak | Donna Ganz | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 1970 | 1483 | 97.1 | — | — | — | — | — | — | — | 33.3% | -2.33 | 0–1 | — | — | +0.30 |
| 1974 | 1489 | 99.2 | — | — | — | — | +44 | — | — | 42.9% | -0.71 | 0–1 | — | — | +0.69 | 1971 | 1493 | 101.5 | — | — | — | — | — | — | — | 50.0% | -1.00 | — | — | — | +0.23 |
| 1975 | 1599 | 120.1 | — | — | — | — | +53 | -2 | -47 | 57.1% | +0.46 | 3–6 (33%) | 3–0 (100%) | 100.2 | +2.43 | 1972 | 1471 | 99.7 | — | — | — | — | — | +32 | — | 33.3% | -1.67 | 0–1 | 1–0 | — | +0.36 |
| 1976 | 1607 | 119.9 | — | — | — | — | -10 | +40 | — | 48.8% | +0.09 | 2–5 (29%) | 1–3 (25%) | — | +0.96 | 1973 | 1504 | 117.4 | — | — | — | — | — | +21 | — | 47.1% | +0.18 | 1–2 (33%) | 0–1 | — | +0.33 |
| 1977 | 1765 | 138.0 | — | — | — | — | -79 | -79 | -75 | 58.1% | +0.41 | 3–3 (50%) | 6–5 (55%) | 102.4 | +0.27 | 1974 | 1562 | 121.6 | — | — | — | — | +2 | -10 | +10 | 41.9% | -0.76 | 4–4 (50%) | 2–5 (29%) | 97.5 | +0.22 |
| 1978 | 1791 | 135.3 | — | — | — | — | +3 | -132 | -30 | 52.6% | +0.33 | 8–6 (57%) | 2–6 (25%) | 99.2 | +2.99 | 1975 | 1721 | 140.7 | — | — | — | — | -125 | +40 | — | 59.3% | +0.78 | 2–1 (67%) | 0–3 (0%) | 99.2 | +0.04 |
| 1979 | 1780 | 155.2 | — | — | — | — | -44 | -74 | +25 | 40.5% | -0.50 | 4–4 (50%) | 1–2 (33%) | 99.0 | -4.03 | 1976 | 1681 | 92.8 | — | — | — | — | -172 | — | — | 11.1% | -3.89 | 0–1 | — | — | -0.30 |
| 1980 | 1742 | 138.8 | — | — | — | — | -89 | +32 | +50 | 52.5% | +0.26 | 2–4 (33%) | 4–3 (57%) | 99.5 | -4.96 | 1977 | 1669 | 120.3 | — | — | — | — | — | +40 | — | 55.6% | +0.15 | 2–3 (40%) | 3–0 (100%) | 100.5 | +0.15 |
| 1981 | 1720 | 143.5 | — | — | — | — | -64 | +96 | — | 43.1% | -0.39 | 4–6 (40%) | 1–5 (17%) | 96.9 | -2.78 | 1978 | 1647 | 112.1 | — | — | — | — | — | — | — | 25.0% | -2.25 | 1–1 | — | — | -0.60 |
| 1982 | 1820 | 142.9 | — | — | — | — | -77 | +69 | -9 | 55.2% | +0.06 | 11–10 (52%) | 9–10 (47%) | 99.8 | -3.53 | 1980 | 1616 | 96.7 | — | — | — | — | — | — | — | 37.5% | -0.62 | 1–1 | 0–1 | — | +0.22 |
| 1983 | 1755 | 138.0 | — | — | — | — | +7 | +104 | +97 | 55.4% | +0.20 | 10–11 (48%) | 7–3 (70%) | 100.0 | +1.14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1984 | 1801 | 134.8 | — | — | — | — | -65 | -14 | +95 | 53.1% | +0.15 | 5–11 (31%) | 7–8 (47%) | 94.0 | -0.64 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1985 | 1605 | 125.4 | — | — | — | — | +10 | +114 | +210 | 37.7% | -0.97 | 1–10 (9%) | 0–1 | — | -0.99 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1986 | 1565 | 105.1 | — | — | — | — | +19 | +86 | +196 | 36.8% | -0.87 | 2–2 (50%) | 0–1 | — | 0.00 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1987 | 1558 | 108.1 | — | — | — | — | — | — | — | 25.0% | -2.38 | — | — | — | -0.56 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1988 | 1542 | 94.0 | — | — | — | — | — | — | — | 0.0% | -4.00 | — | — | — | +0.11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | 1892 | 141.9 | — | — | — | — | -33 | +33 | +34 | 50.0% | -0.05 | 55–80 (41%) | 41–47 (47%) | 93.1 | -1.91 | Career | 1744 | 127.8 | — | — | — | — | -70 | +23 | +10 | 46.2% | -0.41 | 11–15 (42%) | 6–10 (38%) | 93.5 | +1.01 |
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 |
|---|---|---|---|---|---|
| Chris Evert | 0 | 4 | 4 | Sep 1, 1978 | H2H |
| Helen Gourlay | 1 | 3 | 4 | Apr 9, 1977 | H2H |
| Mariana Simionescu | 2 | 2 | 4 | Jun 7, 1975 | H2H |
| Betty Stove | 0 | 3 | 3 | Jan 29, 1976 | H2H |
| Marcie Louie | 0 | 3 | 3 | Jan 21, 1976 | H2H |