H2H data updated: 2026-09-12 00:00 UTC

Mona Guerrant vs Yvonne Vermaak H2H: 1-0

Mona Guerrant holds a 1–0 lead over Yvonne Vermaak in their WTA head-to-head. Across 1 main-draw meeting, Mona Guerrant leads 1–0 on clay. Most recently, Mona Guerrant won the 1977 US Open round of 128 7-6 2-6 6-1.

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Mona Guerrant
USA Age 77 Right-Handed
H2H
1 – 0
1 main-draw meetings
Yvonne Vermaak
RSA Age 69 Right-Handed 155 cm / 5'1"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Mona Guerrant 7-6 2-6 6-1 Yvonne Vermaak Match data Sep 2, 1977* R128 US Open Grand Slam Clay

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
Mona Guerrant — — — 1,941 122 116 51.3% 0 0 0 0 3 3
Yvonne Vermaak #558 #38 10 1,892 239 249 49.0% 0 0 0 0 5 5

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.

Age Mona Guerrant Yvonne Vermaak
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
16 — — — — — — — 1973 0–2 0.0% — 1,495 0 0
17 — — — — — — — 1974 1–2 33.3% — 1,489 0 0
18 — — — — — — — 1975 15–12 55.6% — 1,599 0 0
19 — — — — — — — 1976 8–10 44.4% — 1,606 0 1
20 1969 1–1 50.0% — 1,500 0 0 1977 20–14 58.8% — 1,765 0 2
21 1970 1–2 33.3% — 1,504 0 0 1978 29–23 55.8% — 1,791 0 2
22 1971 3–8 27.3% — 1,517 0 0 1979 15–23 39.5% — 1,779 0 2
23 1972 28–22 56.0% — 1,733 0 1 1980 19–18 51.4% — 1,741 0 2
24 1973 17–19 47.2% — 1,780 0 2 1981 19–28 40.4% — 1,719 0 2
25 1974 12–14 46.2% — 1,779 0 2 1982 36–27 57.1% — 1,820 0 2
26 1975 12–12 50.0% — 1,905 0 2 1983 33–26 55.9% — 1,754 0 4
27 1976 15–14 51.7% — 1,898 0 2 1984 29–28 50.9% #41 1,800 0 5
28 1977 14–9 60.9% — 1,890 0 2 1985 8–21 27.6% #41 1,604 0 5
29 1978 5–11 31.2% — 1,808 0 2 1986 6–11 35.3% #104 1,565 0 5
30 — — — — — — — 1987 1–3 25.0% #201 1,558 0 5
31 1980 14–4 77.8% — 1,812 0 3 1988 0–1 0.0% #287 1,541 0 5

Surface Results by Age

Seasons are aligned by the age each player spent most of that calendar year. 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.

Age Mona Guerrant Yvonne Vermaak
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 %
16 — — — — — — — — — — — — — — — — — 1973 0 2 2 0.0% — — — — — — — — — — — —
17 — — — — — — — — — — — — — — — — — 1974 1 2 3 33.3% — — — — — — — — — — — —
18 — — — — — — — — — — — — — — — — — 1975 4 3 7 57.1% 7 4 11 63.6% 3 4 7 42.9% — — — —
19 — — — — — — — — — — — — — — — — — 1976 1 1 2 50.0% 7 6 13 53.8% 0 2 2 0.0% 0 1 1 0.0%
20 1969 — — — — 1 1 2 50.0% — — — — — — — — 1977 3 2 5 60.0% 6 7 13 46.2% 8 2 10 80.0% 3 3 6 50.0%
21 1970 — — — — 1 2 3 33.3% — — — — — — — — 1978 13 7 20 65.0% 2 2 4 50.0% 8 4 12 66.7% 6 10 16 37.5%
22 1971 0 2 2 0.0% 2 2 4 50.0% 1 4 5 20.0% — — — — 1979 4 6 10 40.0% 4 4 8 50.0% 5 4 9 55.6% 2 9 11 18.2%
23 1972 4 3 7 57.1% 9 8 17 52.9% 14 9 23 60.9% 1 1 2 50.0% 1980 2 5 7 28.6% 9 5 14 64.3% 4 4 8 50.0% 4 4 8 50.0%
24 1973 3 4 7 42.9% 7 7 14 50.0% 2 4 6 33.3% 5 4 9 55.6% 1981 7 9 16 43.8% 11 9 20 55.0% 0 1 1 0.0% 1 9 10 10.0%
25 1974 1 2 3 33.3% 0 3 3 0.0% 5 5 10 50.0% 6 4 10 60.0% 1982 4 4 8 50.0% 13 7 20 65.0% 9 6 15 60.0% 10 10 20 50.0%
26 1975 4 4 8 50.0% 3 2 5 60.0% 1 1 2 50.0% 4 5 9 44.4% 1983 14 4 18 77.8% 7 8 15 46.7% 8 5 13 61.5% 4 9 13 30.8%
27 1976 2 3 5 40.0% 0 1 1 0.0% 5 2 7 71.4% 8 8 16 50.0% 1984 12 7 19 63.2% 7 8 15 46.7% 8 6 14 57.1% 2 7 9 22.2%
28 1977 2 2 4 50.0% 6 3 9 66.7% 4 2 6 66.7% 2 2 4 50.0% 1985 5 8 13 38.5% 1 4 5 20.0% 1 3 4 25.0% 1 6 7 14.3%
29 1978 — — — — 2 2 4 50.0% 0 2 2 0.0% 3 7 10 30.0% 1986 1 2 3 33.3% 4 6 10 40.0% 1 3 4 25.0% — — — —
30 — — — — — — — — — — — — — — — — — 1987 1 1 2 50.0% 0 2 2 0.0% — — — — — — — —
31 1980 0 1 1 0.0% — — — — — — — — 2 1 3 66.7% 1988 0 1 1 0.0% — — — — — — — — — — — —
Career — 16 21 37 43.2% 31 31 62 50.0% 32 29 61 52.5% 31 32 63 49.2% — 72 64 136 52.9% 78 72 150 52.0% 55 44 99 55.6% 33 68 101 32.7%

Advanced Statistics Comparison by Age

Seasons are aligned by the age each player spent most of that calendar year. 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.

Age Mona Guerrant Yvonne Vermaak
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
16 — — — — — — — — — — — — — — — — 1973 1496 101.8 — — — — — — — 20.0% -3.20 0–1 — — -0.39
17 — — — — — — — — — — — — — — — — 1974 1489 99.2 — — — — +44 — — 42.9% -0.71 0–1 — — +0.69
18 — — — — — — — — — — — — — — — — 1975 1599 120.1 — — — — +53 -2 -47 57.1% +0.46 3–6 (33%) 3–0 (100%) 100.2 +2.43
19 — — — — — — — — — — — — — — — — 1976 1607 119.9 — — — — -10 +40 — 48.8% +0.09 2–5 (29%) 1–3 (25%) — +0.96
20 1969 1500 92.5 — — — — — — — 40.0% -2.40 1–0 — — +0.28 1977 1765 138.0 — — — — -79 -79 -75 58.1% +0.41 3–3 (50%) 6–5 (55%) 102.4 +0.27
21 1970 1504 106.4 — — — — — +14 — 42.9% -1.00 0–1 — — +0.10 1978 1791 135.3 — — — — +3 -132 -30 52.6% +0.33 8–6 (57%) 2–6 (25%) 99.2 +2.99
22 1971 1517 118.6 — — — — — +38 +14 35.7% -0.75 2–4 (33%) 0–3 (0%) 95.8 0.00 1979 1780 155.2 — — — — -44 -74 +25 40.5% -0.50 4–4 (50%) 1–2 (33%) 99.0 -4.03
23 1972 1734 136.4 — — — — -121 -79 -58 56.3% +0.56 8–11 (42%) 5–0 (100%) 103.8 +0.32 1980 1742 138.8 — — — — -89 +32 +50 52.5% +0.26 2–4 (33%) 4–3 (57%) 99.5 -4.96
24 1973 1781 144.7 — — — — -54 -77 -115 48.8% -0.15 3–5 (38%) 2–2 (50%) 99.8 -3.77 1981 1720 143.5 — — — — -64 +96 — 43.1% -0.39 4–6 (40%) 1–5 (17%) 96.9 -2.78
25 1974 1779 137.0 — — — — -26 -97 -75 50.9% +0.11 1–4 (20%) 3–4 (43%) 97.1 -1.56 1982 1820 142.9 — — — — -77 +69 -9 55.2% +0.06 11–10 (52%) 9–10 (47%) 99.8 -3.53
26 1975 1906 154.1 — — — — -52 -116 — 48.2% -0.13 5–3 (63%) 2–4 (33%) 103.0 -3.85 1983 1755 138.0 — — — — +7 +104 +97 55.4% +0.20 10–11 (48%) 7–3 (70%) 100.0 +1.14
27 1976 1898 149.2 — — — — -30 — -110 55.9% +0.57 2–8 (20%) 2–5 (29%) 93.6 -2.51 1984 1801 134.8 — — — — -65 -14 +95 53.1% +0.15 5–11 (31%) 7–8 (47%) 94.0 -0.64
28 1977 1890 136.0 — — — — -64 -47 -93 57.7% +0.69 4–4 (50%) 3–1 (75%) 100.8 -0.54 1985 1605 125.4 — — — — +10 +114 +210 37.7% -0.97 1–10 (9%) 0–1 — -0.99
29 1978 1809 135.5 — — — — -44 -17 — 35.9% -0.87 3–4 (43%) 0–3 (0%) — -2.29 1986 1565 105.1 — — — — +19 +86 +196 36.8% -0.87 2–2 (50%) 0–1 — 0.00
30 — — — — — — — — — — — — — — — — 1987 1558 108.1 — — — — — — — 25.0% -2.38 — — — -0.56
31 1980 1812 138.2 — — — — -108 — — 73.8% +2.26 4–2 (67%) 1–0 — +0.36 1988 1542 94.0 — — — — — — — 0.0% -4.00 — — — +0.11
Career — 1942 149.0 — — — — -53 -61 -71 52.5% +0.27 33–46 (42%) 18–22 (45%) 98.6 -5.68 — 1892 141.9 — — — — -33 +33 +34 50.0% -0.05 55–80 (41%) 41–47 (47%) 93.1 -1.91

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.