H2H data updated: 2026-09-01 00:00 UTC
Yvonne Vermaak holds a 1–0 lead over Lena Jacobs 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 1981 South African Open round of 32 6-2 7-5.
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 | 6-2 7-5 | Lena Jacobs | Match data | Nov 28, 1981* | R32 | South African Open | 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 | #558 | #38 | 10 | 1,892 | 239 | 249 | 49.0% | 0 | 0 | 0 | 0 | 5 | 5 |
| Lena Jacobs | — | — | — | 1,537 | 2 | 2 | 50.0% | 0 | 0 | 0 | 0 | 0 | 0 |
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 | Lena Jacobs | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 1980 | 2–1 | 66.7% | — | 1,531 | 0 | 0 |
| 1974 | 1–2 | 33.3% | — | 1,489 | 0 | 0 | 1981 | 0–1 | 0.0% | — | 1,523 | 0 | 0 |
| 1975 | 15–12 | 55.6% | — | 1,599 | 0 | 0 | — | — | — | — | — | — | — |
| 1976 | 8–10 | 44.4% | — | 1,606 | 0 | 1 | — | — | — | — | — | — | — |
| 1977 | 20–14 | 58.8% | — | 1,765 | 0 | 2 | — | — | — | — | — | — | — |
| 1978 | 29–23 | 55.8% | — | 1,791 | 0 | 2 | — | — | — | — | — | — | — |
| 1979 | 15–23 | 39.5% | — | 1,779 | 0 | 2 | — | — | — | — | — | — | — |
| 1980 | 19–18 | 51.4% | — | 1,741 | 0 | 2 | — | — | — | — | — | — | — |
| 1981 | 19–28 | 40.4% | — | 1,719 | 0 | 2 | — | — | — | — | — | — | — |
| 1982 | 36–27 | 57.1% | — | 1,820 | 0 | 2 | — | — | — | — | — | — | — |
| 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 | Lena Jacobs | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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% | — | — | — | — | — | — | — | — | — | — | — | — | 1980 | 2 | 1 | 3 | 66.7% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1974 | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | — | — | — | — | 1981 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1975 | 4 | 3 | 7 | 57.1% | 7 | 4 | 11 | 63.6% | 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% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 | 4 | 8 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 | 68 | 101 | 32.7% | Career | 2 | 2 | 4 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — |
Rows are aligned in career order because complete birth data is unavailable. Metrics are precomputed from eligible main-draw results; point-stat values use the available detailed sample. 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 | Lena Jacobs | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 1980 | 1532 | 113.2 | — | — | — | — | +68 | — | — | 100.0% | +4.25 | — | — | — | +0.16 |
| 1974 | 1489 | 99.2 | — | — | — | — | +44 | — | — | 42.9% | -0.71 | 0–1 | — | — | +0.69 | 1981 | 1523 | 98.0 | — | — | — | — | — | — | — | 0.0% | -3.00 | — | — | — | -0.03 |
| 1975 | 1599 | 120.1 | — | — | — | — | +53 | -2 | -47 | 57.1% | +0.46 | 3–6 (33%) | 3–0 (100%) | — | +2.43 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1976 | 1607 | 119.9 | — | — | — | — | -10 | +40 | — | 48.8% | +0.09 | 2–5 (29%) | 1–3 (25%) | — | +0.96 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1977 | 1765 | 138.0 | — | — | — | — | -79 | -79 | -75 | 58.1% | +0.41 | 3–3 (50%) | 6–5 (55%) | — | +0.27 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1978 | 1791 | 135.3 | — | — | — | — | +3 | -132 | -30 | 52.6% | +0.33 | 8–6 (57%) | 2–6 (25%) | — | +2.99 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1979 | 1780 | 155.2 | — | — | — | — | -44 | -74 | +25 | 40.5% | -0.50 | 4–4 (50%) | 1–2 (33%) | — | -4.03 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1980 | 1742 | 138.8 | — | — | — | — | -89 | +32 | +50 | 52.5% | +0.26 | 2–4 (33%) | 4–3 (57%) | — | -4.96 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1981 | 1720 | 143.5 | — | — | — | — | -64 | +96 | — | 43.1% | -0.39 | 4–6 (40%) | 1–5 (17%) | — | -2.78 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1982 | 1820 | 142.9 | — | — | — | — | -77 | +69 | -9 | 55.2% | +0.06 | 11–10 (52%) | 9–10 (47%) | — | -3.53 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1983 | 1755 | 138.0 | — | — | — | — | +7 | +104 | +97 | 55.4% | +0.20 | 10–11 (48%) | 7–3 (70%) | — | +1.14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1984 | 1801 | 134.8 | — | — | — | — | -65 | -14 | +95 | 53.1% | +0.15 | 5–11 (31%) | 7–8 (47%) | — | -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 | 1537 | 106.0 | — | — | — | — | +68 | — | — | 66.7% | +1.83 | — | — | — | +3.25 |
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 |
|---|---|---|---|---|---|
| Yvonne Vermaak | 0 | 1 | 1 | Nov 28, 1981 | H2H |
| Brigette Cuypers | 0 | 1 | 1 | Nov 29, 1980 | H2H |
| Janice Rapp | 1 | 0 | 1 | Nov 28, 1980 | H2H |
| Vicki Beggs | 1 | 0 | 1 | Nov 27, 1980 | H2H |