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

Ann Kiyomura Hayashi vs Yvonne Vermaak H2H: 1-0

Ann Kiyomura Hayashi holds a 1–0 lead over Yvonne Vermaak in their WTA head-to-head. Across 1 main-draw meeting, Ann Kiyomura Hayashi leads 1–0 on grass. Most recently, Ann Kiyomura Hayashi won the 1982 Birmingham round of 16 7-5 6-3.

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

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Ann Kiyomura Hayashi 7-5 6-3 Yvonne Vermaak Match data Jun 11, 1982* R16 Birmingham WTA 250 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.

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
Ann Kiyomura Hayashi — — — 1,925 182 200 47.6% 0 0 0 0 2 2
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.

Ann Kiyomura Hayashi Yvonne Vermaak
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
1968 0–1 0.0% — 1,488 0 0 1973 0–2 0.0% — 1,495 0 0
1969 0–1 0.0% — 1,473 0 0 1974 1–2 33.3% — 1,489 0 0
1970 0–1 0.0% — 1,459 0 0 1975 15–12 55.6% — 1,599 0 0
1971 0–1 0.0% — 1,457 0 0 1976 8–10 44.4% — 1,606 0 1
1972 5–4 55.6% — 1,516 0 0 1977 20–14 58.8% — 1,765 0 2
1973 28–30 48.3% — 1,648 0 0 1978 29–23 55.8% — 1,791 0 2
1974 24–13 64.9% — 1,789 0 0 1979 15–23 39.5% — 1,779 0 2
1975 7–12 36.8% — 1,749 0 0 1980 19–18 51.4% — 1,741 0 2
1976 9–16 36.0% — 1,724 0 0 1981 19–28 40.4% — 1,719 0 2
1977 4–8 33.3% — 1,740 0 0 1982 36–27 57.1% — 1,820 0 2
1978 10–7 58.8% — 1,809 0 1 1983 33–26 55.9% — 1,754 0 4
1979 26–22 54.2% — 1,874 0 1 1984 29–28 50.9% #41 1,800 0 5
1980 13–20 39.4% — 1,718 0 1 1985 8–21 27.6% #41 1,604 0 5
1981 23–19 54.8% — 1,852 0 2 1986 6–11 35.3% #104 1,565 0 5
1982 18–20 47.4% — 1,828 0 2 1987 1–3 25.0% #201 1,558 0 5
1983 13–20 39.4% — 1,716 0 2 1988 0–1 0.0% #287 1,541 0 5
1984 2–5 28.6% — 1,686 0 2 — — — — — — —

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.

Ann Kiyomura Hayashi 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 %
1968 0 1 1 0.0% — — — — — — — — — — — — 1973 0 2 2 0.0% — — — — — — — — — — — —
1969 0 1 1 0.0% — — — — — — — — — — — — 1974 1 2 3 33.3% — — — — — — — — — — — —
1970 0 1 1 0.0% — — — — — — — — — — — — 1975 4 3 7 57.1% 7 4 11 63.6% 3 4 7 42.9% — — — —
1971 — — — — — — — — 0 1 1 0.0% — — — — 1976 1 1 2 50.0% 7 6 13 53.8% 0 2 2 0.0% 0 1 1 0.0%
1972 — — — — 1 1 2 50.0% 4 2 6 66.7% 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%
1973 4 5 9 44.4% 7 7 14 50.0% 11 11 22 50.0% 6 7 13 46.2% 1978 13 7 20 65.0% 2 2 4 50.0% 8 4 12 66.7% 6 10 16 37.5%
1974 5 2 7 71.4% 1 2 3 33.3% 14 7 21 66.7% 4 2 6 66.7% 1979 4 6 10 40.0% 4 4 8 50.0% 5 4 9 55.6% 2 9 11 18.2%
1975 4 4 8 50.0% 0 1 1 0.0% 2 2 4 50.0% 0 4 4 0.0% 1980 2 5 7 28.6% 9 5 14 64.3% 4 4 8 50.0% 4 4 8 50.0%
1976 0 1 1 0.0% 2 2 4 50.0% 2 4 6 33.3% 5 9 14 35.7% 1981 7 9 16 43.8% 11 9 20 55.0% 0 1 1 0.0% 1 9 10 10.0%
1977 0 1 1 0.0% 0 1 1 0.0% 2 1 3 66.7% 2 5 7 28.6% 1982 4 4 8 50.0% 13 7 20 65.0% 9 6 15 60.0% 10 10 20 50.0%
1978 4 2 6 66.7% 4 0 4 100.0% 1 2 3 33.3% 1 3 4 25.0% 1983 14 4 18 77.8% 7 8 15 46.7% 8 5 13 61.5% 4 9 13 30.8%
1979 10 7 17 58.8% — — — — 1 2 3 33.3% 15 13 28 53.6% 1984 12 7 19 63.2% 7 8 15 46.7% 8 6 14 57.1% 2 7 9 22.2%
1980 7 7 14 50.0% — — — — 3 5 8 37.5% 3 8 11 27.3% 1985 5 8 13 38.5% 1 4 5 20.0% 1 3 4 25.0% 1 6 7 14.3%
1981 2 4 6 33.3% 2 2 4 50.0% 9 6 15 60.0% 10 7 17 58.8% 1986 1 2 3 33.3% 4 6 10 40.0% 1 3 4 25.0% — — — —
1982 6 5 11 54.5% 0 1 1 0.0% 7 6 13 53.8% 5 8 13 38.5% 1987 1 1 2 50.0% 0 2 2 0.0% — — — — — — — —
1983 5 5 10 50.0% — — — — 4 6 10 40.0% 4 9 13 30.8% 1988 0 1 1 0.0% — — — — — — — — — — — —
1984 0 2 2 0.0% — — — — 2 2 4 50.0% 0 1 1 0.0% — — — — — — — — — — — — — — — — —
Career 47 48 95 49.5% 17 17 34 50.0% 62 57 119 52.1% 55 77 132 41.7% Career 72 64 136 52.9% 78 72 150 52.0% 55 44 99 55.6% 33 68 101 32.7%

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.

Ann Kiyomura Hayashi 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
1968 1488 90.8 — — — — — — — 0.0% -6.00 — — — -0.08 1973 1496 101.8 — — — — — — — 20.0% -3.20 0–1 — — -0.39
1969 1473 94.6 — — — — — — — 0.0% -4.50 — — — +0.08 1974 1489 99.2 — — — — +44 — — 42.9% -0.71 0–1 — — +0.69
1970 1460 98.9 — — — — — — — 0.0% -2.00 — 0–1 — +0.19 1975 1599 120.1 — — — — +53 -2 -47 57.1% +0.46 3–6 (33%) 3–0 (100%) 100.2 +2.43
1971 1457 104.8 — — — — — — — 33.3% -0.67 0–1 — — -0.19 1976 1607 119.9 — — — — -10 +40 — 48.8% +0.09 2–5 (29%) 1–3 (25%) — +0.96
1972 1516 107.6 — — — — — — +85 47.6% +0.24 3–0 (100%) 0–1 — +1.18 1977 1765 138.0 — — — — -79 -79 -75 58.1% +0.41 3–3 (50%) 6–5 (55%) 102.4 +0.27
1973 1648 127.6 — — — — -75 -23 -24 50.0% -0.14 8–12 (40%) 4–4 (50%) 99.3 +4.25 1978 1791 135.3 — — — — +3 -132 -30 52.6% +0.33 8–6 (57%) 2–6 (25%) 99.2 +2.99
1974 1789 136.8 — — — — -106 -163 +40 59.5% +0.55 8–4 (67%) 2–1 (67%) 107.2 +0.93 1979 1780 155.2 — — — — -44 -74 +25 40.5% -0.50 4–4 (50%) 1–2 (33%) 99.0 -4.03
1975 1750 124.3 — — — — -7 — +32 38.6% -1.16 3–5 (38%) 2–1 (67%) 100.1 -0.93 1980 1742 138.8 — — — — -89 +32 +50 52.5% +0.26 2–4 (33%) 4–3 (57%) 99.5 -4.96
1976 1724 127.9 — — — — -53 -75 +49 41.1% -0.80 3–5 (38%) 1–1 — -0.96 1981 1720 143.5 — — — — -64 +96 — 43.1% -0.39 4–6 (40%) 1–5 (17%) 96.9 -2.78
1977 1740 135.0 — — — — -68 — +42 37.0% -0.93 1–2 (33%) 0–1 — -1.45 1982 1820 142.9 — — — — -77 +69 -9 55.2% +0.06 11–10 (52%) 9–10 (47%) 99.8 -3.53
1978 1810 140.1 — — — — -59 -135 -22 56.8% +0.62 2–1 (67%) 1–2 (33%) 100.7 -0.22 1983 1755 138.0 — — — — +7 +104 +97 55.4% +0.20 10–11 (48%) 7–3 (70%) 100.0 +1.14
1979 1875 150.3 — — — — +16 — -129 53.6% +0.14 12–8 (60%) 5–4 (56%) 104.4 -0.58 1984 1801 134.8 — — — — -65 -14 +95 53.1% +0.15 5–11 (31%) 7–8 (47%) 94.0 -0.64
1980 1719 127.4 — — — — +24 — -38 46.7% -0.05 4–9 (31%) 2–4 (33%) 91.8 -0.63 1985 1605 125.4 — — — — +10 +114 +210 37.7% -0.97 1–10 (9%) 0–1 — -0.99
1981 1852 135.7 — — — — -26 -139 -64 53.7% +0.03 6–5 (55%) 3–2 (60%) 101.7 -0.47 1986 1565 105.1 — — — — +19 +86 +196 36.8% -0.87 2–2 (50%) 0–1 — 0.00
1982 1828 133.7 — — — — -41 — 0 43.0% -0.73 9–5 (64%) 6–1 (86%) 108.1 -4.10 1987 1558 108.1 — — — — — — — 25.0% -2.38 — — — -0.56
1983 1717 130.9 — — — — +25 — +29 42.0% -0.68 2–3 (40%) 6–3 (67%) 100.2 -1.71 1988 1542 94.0 — — — — — — — 0.0% -4.00 — — — +0.11
1984 1687 109.3 — — — — -20 — +88 26.7% -2.27 1–0 1–0 — -0.36 — — — — — — — — — — — — — — — —
Career 1926 140.1 — — — — -21 -76 +3 48.0% -0.26 62–60 (51%) 33–26 (56%) 104.8 -1.34 Career 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.