H2H data updated: 2026-09-14 00:00 UTC

Yvonne Vermaak vs Betty Ann Grubb H2H: 2-0

Yvonne Vermaak holds a 2–0 lead over Betty Ann Grubb in their WTA head-to-head. Across 2 main-draw meetings, Yvonne Vermaak leads 1–0 on carpet and 1–0 on clay. Most recently, Yvonne Vermaak won the 1979 Vienna round of 16 6-1 6-2.

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Yvonne Vermaak
RSA Age 69 Right-Handed 155 cm / 5'1"
H2H
2 – 0
2 main-draw meetings
Betty Ann Grubb
USA

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Yvonne Vermaak 6-1 6-2 Betty Ann Grubb Match data May 18, 1979* R16 Vienna WTA 250 Clay
Yvonne Vermaak 7-5 6-3 Betty Ann Grubb Match data Mar 3, 1977* R32 San Francisco WTA 250 Carpet

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.

Career Comparison

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
Betty Ann Grubb — — — 1,824 124 112 52.5% 0 0 0 0 6 6

Career Progression by Age

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 Betty Ann Grubb
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
1973 0–2 0.0% — 1,495 0 0 1968 21–8 72.4% — 1,633 0 2
1974 1–2 33.3% — 1,489 0 0 1969 29–14 67.4% — 1,777 0 4
1975 15–12 55.6% — 1,599 0 0 1970 18–15 54.5% — 1,684 0 4
1976 8–10 44.4% — 1,606 0 1 1971 5–11 31.2% — 1,679 0 4
1977 20–14 58.8% — 1,765 0 2 1972 2–2 50.0% — 1,673 0 5
1978 29–23 55.8% — 1,791 0 2 1973 4–4 50.0% — 1,699 0 6
1979 15–23 39.5% — 1,779 0 2 1974 7–10 41.2% — 1,675 0 6
1980 19–18 51.4% — 1,741 0 2 1975 5–4 55.6% — 1,728 0 6
1981 19–28 40.4% — 1,719 0 2 1976 2–4 33.3% — 1,683 0 6
1982 36–27 57.1% — 1,820 0 2 1977 0–2 0.0% — 1,652 0 6
1983 33–26 55.9% — 1,754 0 4 1978 3–1 75.0% — 1,660 0 6
1984 29–28 50.9% #41 1,800 0 5 1979 25–26 49.0% — 1,816 0 6
1985 8–21 27.6% #41 1,604 0 5 1980 2–9 18.2% — 1,721 0 6
1986 6–11 35.3% #104 1,565 0 5 1981 1–2 33.3% — 1,709 0 6
1987 1–3 25.0% #201 1,558 0 5 — — — — — — —
1988 0–1 0.0% #287 1,541 0 5 — — — — — — —

Surface Results by Career Season

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 Betty Ann Grubb
Yr HardClayGrassCarpet Yr HardClayGrassCarpet
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% — — — — — — — — — — — — 1968 9 2 11 81.8% 10 3 13 76.9% 2 3 5 40.0% — — — —
1974 1 2 3 33.3% — — — — — — — — — — — — 1969 10 3 13 76.9% — — — — 14 9 23 60.9% 2 2 4 50.0%
1975 4 3 7 57.1% 7 4 11 63.6% 3 4 7 42.9% — — — — 1970 6 3 9 66.7% 5 4 9 55.6% 5 6 11 45.5% 1 1 2 50.0%
1976 1 1 2 50.0% 7 6 13 53.8% 0 2 2 0.0% 0 1 1 0.0% 1971 2 3 5 40.0% 2 3 5 40.0% 1 2 3 33.3% 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% 1972 0 2 2 0.0% — — — — — — — — — — — —
1978 13 7 20 65.0% 2 2 4 50.0% 8 4 12 66.7% 6 10 16 37.5% 1973 3 2 5 60.0% — — — — — — — — 1 2 3 33.3%
1979 4 6 10 40.0% 4 4 8 50.0% 5 4 9 55.6% 2 9 11 18.2% 1974 6 5 11 54.5% 1 2 3 33.3% — — — — 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% 1975 5 3 8 62.5% — — — — — — — — 0 1 1 0.0%
1981 7 9 16 43.8% 11 9 20 55.0% 0 1 1 0.0% 1 9 10 10.0% 1976 2 3 5 40.0% 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% 1977 — — — — 0 1 1 0.0% — — — — 0 1 1 0.0%
1983 14 4 18 77.8% 7 8 15 46.7% 8 5 13 61.5% 4 9 13 30.8% 1979 8 9 17 47.1% 4 4 8 50.0% 9 6 15 60.0% 4 7 11 36.4%
1984 12 7 19 63.2% 7 8 15 46.7% 8 6 14 57.1% 2 7 9 22.2% 1980 0 1 1 0.0% 0 1 1 0.0% 2 2 4 50.0% 0 5 5 0.0%
1985 5 8 13 38.5% 1 4 5 20.0% 1 3 4 25.0% 1 6 7 14.3% 1981 1 2 3 33.3% — — — — — — — — — — — —
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 52 38 90 57.8% 22 19 41 53.7% 33 28 61 54.1% 8 25 33 24.2%

Advanced Statistics Comparison by Career Season

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 Betty Ann Grubb
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 1968 1633 121.5 — — — — +94 +16 -113 69.8% +1.56 3–2 (60%) — — 0.00
1974 1489 99.2 — — — — +44 — — 42.9% -0.71 0–1 — — +0.69 1969 1777 129.3 — — — — +55 — -18 64.1% +0.96 5–3 (63%) — — +1.73
1975 1599 120.1 — — — — +53 -2 -47 57.1% +0.46 3–6 (33%) 3–0 (100%) 100.2 +2.43 1970 1685 118.2 — — — — +114 -50 +6 53.4% +0.34 4–3 (57%) 1–0 — +0.50
1976 1607 119.9 — — — — -10 +40 — 48.8% +0.09 2–5 (29%) 1–3 (25%) — +0.96 1971 1680 131.9 — — — — +54 -42 +16 25.0% -1.81 2–0 0–2 — -2.09
1977 1765 138.0 — — — — -79 -79 -75 58.1% +0.41 3–3 (50%) 6–5 (55%) 102.4 +0.27 1972 1673 104.5 — — — — — — — 50.0% 0.00 — — — -0.16
1978 1791 135.3 — — — — +3 -132 -30 52.6% +0.33 8–6 (57%) 2–6 (25%) 99.2 +2.99 1973 1700 124.2 — — — — +39 — — 47.1% -0.35 1–0 0–1 — +0.31
1979 1780 155.2 — — — — -44 -74 +25 40.5% -0.50 4–4 (50%) 1–2 (33%) 99.0 -4.03 1974 1676 118.4 — — — — -14 -33 — 47.2% +0.08 1–3 (25%) 0–5 (0%) 92.5 -0.32
1980 1742 138.8 — — — — -89 +32 +50 52.5% +0.26 2–4 (33%) 4–3 (57%) 99.5 -4.96 1975 1728 114.2 — — — — +19 — — 47.4% -0.31 2–1 (67%) 2–1 (67%) 101.9 +0.34
1981 1720 143.5 — — — — -64 +96 — 43.1% -0.39 4–6 (40%) 1–5 (17%) 96.9 -2.78 1976 1684 105.1 — — — — +18 — — 33.3% -0.58 — 0–2 — +0.77
1982 1820 142.9 — — — — -77 +69 -9 55.2% +0.06 11–10 (52%) 9–10 (47%) 99.8 -3.53 1977 1653 100.1 — — — — — — — 20.0% -1.00 0–1 0–1 — +0.17
1983 1755 138.0 — — — — +7 +104 +97 55.4% +0.20 10–11 (48%) 7–3 (70%) 100.0 +1.14 1978 1660 112.4 — — — — — — — 75.0% +2.63 — — — +0.35
1984 1801 134.8 — — — — -65 -14 +95 53.1% +0.15 5–11 (31%) 7–8 (47%) 94.0 -0.64 1979 1817 140.6 — — — — -45 -172 -41 45.3% -0.42 12–5 (71%) 5–5 (50%) 106.5 -0.93
1985 1605 125.4 — — — — +10 +114 +210 37.7% -0.97 1–10 (9%) 0–1 — -0.99 1980 1722 127.1 — — — — -73 — +67 33.3% -1.07 2–5 (29%) 1–2 (33%) 95.6 -1.30
1986 1565 105.1 — — — — +19 +86 +196 36.8% -0.87 2–2 (50%) 0–1 — 0.00 1981 1709 110.6 — — — — -33 — — 33.3% -0.50 — 0–1 — -0.04
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 1825 133.9 — — — — +19 -51 -20 51.1% +0.14 32–23 (58%) 9–20 (31%) 97.8 -0.29

Career Rivalries

Each player's five most-played main-draw opponents. The current matchup is highlighted when it appears in a player's top five.