H2H data updated: 2026-09-13 00:00 UTC

Kazuko Sawamatsu vs Valerie Ziegenfuss H2H: 2-0

Kazuko Sawamatsu holds a 2–0 lead over Valerie Ziegenfuss in their WTA head-to-head. Across 2 main-draw meetings, Kazuko Sawamatsu leads 1–0 on clay and 1–0 on grass. Most recently, Kazuko Sawamatsu won the 1970 Montana quarterfinal 6-1 4-6 6-2.

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Kazuko Sawamatsu
JPN Age 75 Right-Handed
H2H
2 – 0
2 main-draw meetings
Valerie Ziegenfuss
USA Age 77

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Kazuko Sawamatsu 6-1 4-6 6-2 Valerie Ziegenfuss Match data Jul 25, 1970* QF Montana WTA 250 Clay
Kazuko Sawamatsu 6-0 7-5 Valerie Ziegenfuss Match data Jun 17, 1970* R64 Queen's Club Championships 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
Kazuko Sawamatsu — — — 1,954 179 100 64.2% 0 0 0 1 8 9
Valerie Ziegenfuss — — — 1,954 231 232 49.9% 0 0 0 0 3 3

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 Kazuko Sawamatsu Valerie Ziegenfuss
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
17 1968 9–7 56.2% — 1,556 0 0 — — — — — — —
18 1969 16–8 66.7% — 1,674 0 1 — — — — — — —
19 1970 10–8 55.6% — 1,727 0 2 1968 35–24 59.3% — 1,605 0 0
20 1971 18–10 64.3% — 1,826 0 3 1969 28–24 53.8% — 1,733 0 1
21 1972 28–16 63.6% — 1,848 0 6 1970 40–28 58.8% — 1,779 0 2
22 1973 38–21 64.4% — 1,825 0 6 1971 23–29 44.2% — 1,798 0 3
23 1974 37–20 64.9% — 1,900 0 8 1972 26–24 52.0% — 1,820 0 3
24 1975 23–10 69.7% — 1,954 0 9 1973 33–29 53.2% — 1,761 0 3
25 — — — — — — — 1974 12–14 46.2% — 1,788 0 3
26 — — — — — — — 1975 16–16 50.0% — 1,830 0 3
27 — — — — — — — 1976 12–20 37.5% — 1,746 0 3
28 — — — — — — — 1977 2–12 14.3% — 1,677 0 3
29 — — — — — — — 1978 3–11 21.4% — 1,654 0 3
30 — — — — — — — 1979 1–1 50.0% — 1,667 0 3

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 Kazuko Sawamatsu Valerie Ziegenfuss
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 %
17 1968 — — — — 9 5 14 64.3% 0 2 2 0.0% — — — — — — — — — — — — — — — — — — — — —
18 1969 — — — — 13 6 19 68.4% 3 2 5 60.0% — — — — — — — — — — — — — — — — — — — — —
19 1970 — — — — 3 4 7 42.9% 4 4 8 50.0% — — — — 1968 5 4 9 55.6% 16 9 25 64.0% 13 9 22 59.1% 1 2 3 33.3%
20 1971 — — — — 4 4 8 50.0% 14 6 20 70.0% — — — — 1969 5 6 11 45.5% 12 8 20 60.0% 10 8 18 55.6% 1 2 3 33.3%
21 1972 1 1 2 50.0% 11 7 18 61.1% 13 8 21 61.9% 3 0 3 100.0% 1970 12 7 19 63.2% 13 8 21 61.9% 12 8 20 60.0% 2 3 5 40.0%
22 1973 3 1 4 75.0% 18 8 26 69.2% 16 9 25 64.0% 1 3 4 25.0% 1971 4 6 10 40.0% 10 7 17 58.8% 6 6 12 50.0% 3 10 13 23.1%
23 1974 6 1 7 85.7% 11 9 20 55.0% 17 9 26 65.4% 3 1 4 75.0% 1972 6 4 10 60.0% 9 7 16 56.3% 4 4 8 50.0% 7 9 16 43.8%
24 1975 — — — — 19 7 26 73.1% 4 3 7 57.1% — — — — 1973 5 6 11 45.5% 6 6 12 50.0% 8 4 12 66.7% 12 12 24 50.0%
25 — — — — — — — — — — — — — — — — — 1974 3 4 7 42.9% 0 1 1 0.0% 0 1 1 0.0% 9 8 17 52.9%
26 — — — — — — — — — — — — — — — — — 1975 8 6 14 57.1% 3 3 6 50.0% 1 1 2 50.0% 4 6 10 40.0%
27 — — — — — — — — — — — — — — — — — 1976 3 3 6 50.0% 4 8 12 33.3% 4 4 8 50.0% 1 5 6 16.7%
28 — — — — — — — — — — — — — — — — — 1977 0 1 1 0.0% 0 4 4 0.0% 0 1 1 0.0% 2 6 8 25.0%
29 — — — — — — — — — — — — — — — — — 1978 0 4 4 0.0% 3 3 6 50.0% 0 2 2 0.0% 0 2 2 0.0%
30 — — — — — — — — — — — — — — — — — 1979 1 1 2 50.0% — — — — — — — — — — — —
Career — 10 3 13 76.9% 88 50 138 63.8% 71 43 114 62.3% 7 4 11 63.6% — 52 52 104 50.0% 76 64 140 54.3% 58 48 106 54.7% 42 65 107 39.3%

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 Kazuko Sawamatsu Valerie Ziegenfuss
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
17 1968 1556 119.1 — — — — — +59 — 56.3% +0.87 2–0 — — +0.07 — — — — — — — — — — — — — — — —
18 1969 1674 127.4 — — — — — +49 -122 64.7% +1.25 2–1 (67%) — — +0.72 — — — — — — — — — — — — — — — —
19 1970 1727 133.7 — — — — — -29 -107 59.1% +0.75 2–6 (25%) — — -1.68 1968 1605 119.1 — — — — -45 +58 +13 57.4% +0.80 9–4 (69%) — — -0.64
20 1971 1827 139.8 — — — — — -118 0 59.3% +0.81 6–1 (86%) 1–0 — -2.27 1969 1734 126.4 — — — — -175 -30 +9 51.4% +0.32 6–3 (67%) — — -2.24
21 1972 1848 149.8 — — — — -200 -59 +3 61.1% +1.22 5–4 (56%) — — -3.87 1970 1780 133.1 — — — — -34 -31 +26 55.6% +0.45 11–4 (73%) 0–1 — -2.50
22 1973 1826 145.5 — — — — -160 +61 +45 60.9% +0.99 10–5 (67%) 3–4 (43%) 104.0 +1.60 1971 1799 143.5 — — — — -114 +2 0 46.0% -0.35 5–8 (38%) 3–2 (60%) 99.7 -6.44
23 1974 1900 150.9 — — — — -79 -49 +35 61.7% +0.94 8–2 (80%) 4–3 (57%) 106.4 -3.51 1972 1821 139.7 — — — — -47 -20 -41 48.2% +0.09 9–3 (75%) 4–4 (50%) 105.3 -5.05
24 1975 1955 150.1 — — — — — +26 -50 64.9% +1.09 6–2 (75%) 3–1 (75%) 106.5 -0.94 1973 1761 143.5 — — — — -2 +54 +48 54.3% +0.18 7–9 (44%) 4–5 (44%) 95.0 -5.77
25 — — — — — — — — — — — — — — — — 1974 1789 134.2 — — — — +8 — — 46.6% -0.29 3–3 (50%) 0–3 (0%) 97.0 -2.64
26 — — — — — — — — — — — — — — — — 1975 1830 135.8 — — — — +53 -30 — 49.3% -0.35 6–5 (55%) 2–2 (50%) 99.8 -0.81
27 — — — — — — — — — — — — — — — — 1976 1746 126.6 — — — — +34 -51 +32 41.1% -0.78 3–6 (33%) 3–2 (60%) 97.3 -2.74
28 — — — — — — — — — — — — — — — — 1977 1678 124.2 — — — — +10 -22 — 16.7% -2.17 1–1 1–3 (25%) — -1.87
29 — — — — — — — — — — — — — — — — 1978 1654 130.9 — — — — -20 +22 — 29.4% -1.50 2–4 (33%) 3–1 (75%) 99.1 -2.61
30 — — — — — — — — — — — — — — — — 1979 1667 111.1 — — — — — — — 40.0% -0.20 1–0 0–1 — -0.15
Career — 1955 150.4 — — — — -131 +6 +3 61.3% +1.01 41–21 (66%) 11–8 (58%) 110.7 -3.61 — 1954 139.2 — — — — -28 -1 +15 49.3% -0.01 63–50 (56%) 20–24 (45%) 101.1 -7.31

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.