H2H data updated: 2026-10-29 00:00 UTC

Valerie Ziegenfuss vs Ilana Kloss H2H: 0-2

Ilana Kloss holds a 2–0 lead over Valerie Ziegenfuss in their WTA head-to-head. Across 2 main-draw meetings, Ilana Kloss leads 1–0 on clay and 1–0 on hard courts. Most recently, Ilana Kloss won the 1978 US Open round of 64 3-6 6-3 6-4.

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Valerie Ziegenfuss
USA Age 77
H2H
0 – 2
2 main-draw meetings
Ilana Kloss
RSA Age 70 Left-Handed 164 cm / 5'5"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Ilana Kloss 3-6 6-3 6-4 Valerie Ziegenfuss Match data Sep 1, 1978* R64 US Open Grand Slam Hard
Ilana Kloss 2-6 6-3 6-0 Valerie Ziegenfuss Match data Aug 12, 1976* R32 Indianapolis WTA 250 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
Valerie Ziegenfuss — — — 1,954 233 233 50.0% 0 0 0 0 3 3
Ilana Kloss — — — 1,890 135 145 48.2% 0 0 0 0 8 8

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 Valerie Ziegenfuss Ilana Kloss
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
14 — — — — — — — 1970 0–1 0.0% — 1,491 0 0
15 — — — — — — — 1971 5–4 55.6% — 1,561 0 1
16 — — — — — — — 1972 13–12 52.0% — 1,592 0 3
17 — — — — — — — 1973 38–18 67.9% — 1,872 0 8
18 — — — — — — — 1974 19–16 54.3% — 1,801 0 8
19 1968 35–24 59.3% — 1,605 0 0 1975 9–20 31.0% — 1,688 0 8
20 1969 28–24 53.8% — 1,733 0 1 1976 18–15 54.5% — 1,785 0 8
21 1970 40–28 58.8% — 1,779 0 2 1977 4–13 23.5% — 1,668 0 8
22 1971 23–29 44.2% — 1,798 0 3 1978 14–11 56.0% — 1,741 0 8
23 1972 26–24 52.0% — 1,820 0 3 1979 15–26 36.6% — 1,699 0 8
24 1973 33–29 53.2% — 1,761 0 3 1980 0–8 0.0% — 1,605 0 8
25 1974 12–14 46.2% — 1,788 0 3 — — — — — — —
26 1975 16–16 50.0% — 1,830 0 3 1982 0–1 0.0% — 1,586 0 8
27 1976 12–20 37.5% — 1,746 0 3 — — — — — — —
28 1977 2–12 14.3% — 1,679 0 3 — — — — — — —
29 1978 5–12 29.4% — 1,651 0 3 — — — — — — —
30 1979 1–1 50.0% — 1,664 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 Valerie Ziegenfuss Ilana Kloss
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 %
14 — — — — — — — — — — — — — — — — — 1970 0 1 1 0.0% — — — — — — — — — — — —
15 — — — — — — — — — — — — — — — — — 1971 5 4 9 55.6% — — — — — — — — — — — —
16 — — — — — — — — — — — — — — — — — 1972 8 7 15 53.3% 0 1 1 0.0% 3 4 7 42.9% — — — —
17 — — — — — — — — — — — — — — — — — 1973 15 6 21 71.4% 14 7 21 66.7% 9 5 14 64.3% — — — —
18 — — — — — — — — — — — — — — — — — 1974 8 5 13 61.5% 3 4 7 42.9% 2 3 5 40.0% 2 2 4 50.0%
19 1968 5 4 9 55.6% 16 9 25 64.0% 13 9 22 59.1% 1 2 3 33.3% 1975 1 9 10 10.0% 1 2 3 33.3% 1 2 3 33.3% 2 6 8 25.0%
20 1969 5 6 11 45.5% 12 8 20 60.0% 10 8 18 55.6% 1 2 3 33.3% 1976 3 2 5 60.0% 9 8 17 52.9% 5 4 9 55.6% 1 1 2 50.0%
21 1970 12 7 19 63.2% 13 8 21 61.9% 12 8 20 60.0% 2 3 5 40.0% 1977 1 1 2 50.0% 1 6 7 14.3% 2 2 4 50.0% 0 4 4 0.0%
22 1971 4 6 10 40.0% 10 7 17 58.8% 6 6 12 50.0% 3 10 13 23.1% 1978 4 4 8 50.0% — — — — 9 4 13 69.2% 1 3 4 25.0%
23 1972 6 4 10 60.0% 9 7 16 56.3% 4 4 8 50.0% 7 9 16 43.8% 1979 2 7 9 22.2% 1 4 5 20.0% 4 5 9 44.4% 8 10 18 44.4%
24 1973 5 6 11 45.5% 6 6 12 50.0% 8 4 12 66.7% 12 12 24 50.0% 1980 0 1 1 0.0% 0 2 2 0.0% 0 2 2 0.0% 0 3 3 0.0%
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% 1982 — — — — — — — — 0 1 1 0.0% — — — —
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 2 5 7 28.6% 3 3 6 50.0% 0 2 2 0.0% 0 2 2 0.0% — — — — — — — — — — — — — — — — —
30 1979 1 1 2 50.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 54 53 107 50.5% 76 64 140 54.3% 58 48 106 54.7% 42 65 107 39.3% — 47 47 94 50.0% 29 34 63 46.0% 35 32 67 52.2% 14 29 43 32.6%

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 Valerie Ziegenfuss Ilana Kloss
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
14 — — — — — — — — — — — — — — — — 1970 1491 97.3 — — — — — — — 0.0% -4.50 — — — +0.01
15 — — — — — — — — — — — — — — — — 1971 1562 111.3 — — — — +63 — — 57.9% +0.26 0–1 0–1 — +1.35
16 — — — — — — — — — — — — — — — — 1972 1593 123.4 — — — — +46 — -33 54.5% +0.64 1–4 (20%) 0–2 — +3.97
17 — — — — — — — — — — — — — — — — 1973 1872 144.6 — — — — -17 -132 -190 66.4% +1.36 7–9 (44%) 2–1 (67%) 101.0 +4.65
18 — — — — — — — — — — — — — — — — 1974 1802 136.3 — — — — +25 -83 -116 52.2% +0.16 1–4 (20%) 2–1 (67%) 97.5 -2.24
19 1968 1605 119.1 — — — — -45 +58 +13 57.4% +0.80 9–4 (69%) — — -0.64 1975 1688 127.3 — — — — -12 -4 -4 36.4% -0.99 2–8 (20%) 3–5 (38%) 91.8 -1.35
20 1969 1734 126.4 — — — — -175 -30 +9 51.4% +0.32 6–3 (67%) — — -2.24 1976 1785 138.9 — — — — -89 -30 -55 50.6% +0.13 8–3 (73%) 3–2 (60%) 108.5 -2.55
21 1970 1780 133.1 — — — — -34 -31 +26 55.6% +0.45 11–4 (73%) 0–1 — -2.50 1977 1668 111.1 — — — — -42 +3 +35 28.2% -1.69 2–3 (40%) 2–1 (67%) 99.1 -0.31
22 1971 1799 143.5 — — — — -114 +2 0 46.0% -0.35 5–8 (38%) 3–2 (60%) 99.7 -6.44 1978 1741 124.4 — — — — -84 — +34 55.9% +0.24 4–5 (44%) 5–6 (45%) 100.4 +1.14
23 1972 1821 139.7 — — — — -47 -20 -41 48.2% +0.09 9–3 (75%) 4–4 (50%) 105.3 -5.04 1979 1700 127.2 — — — — -31 -53 +29 36.8% -1.15 10–5 (67%) 7–2 (78%) 110.6 -0.20
24 1973 1761 143.5 — — — — -2 +54 +48 54.3% +0.18 7–9 (44%) 4–5 (44%) 95.0 -5.52 1980 1605 102.3 — — — — -47 — — 5.9% -3.18 0–1 0–2 — -0.55
25 1974 1789 134.2 — — — — +8 — — 46.6% -0.29 3–3 (50%) 0–3 (0%) 97.0 -2.42 — — — — — — — — — — — — — — — —
26 1975 1830 135.8 — — — — +53 -29 — 49.3% -0.35 6–5 (55%) 2–2 (50%) 99.8 -1.06 1982 1586 97.0 — — — — — — — 33.3% -2.67 0–1 — — +0.16
27 1976 1747 126.7 — — — — +33 -52 +32 41.1% -0.78 3–6 (33%) 3–2 (60%) 97.4 -2.67 — — — — — — — — — — — — — — — —
28 1977 1679 124.6 — — — — +10 -23 — 16.7% -2.17 1–1 1–3 (25%) — -1.96 — — — — — — — — — — — — — — — —
29 1978 1652 127.4 — — — — -20 +24 — 36.6% -1.17 2–5 (29%) 5–1 (83%) 99.1 -1.13 — — — — — — — — — — — — — — — —
30 1979 1664 111.0 — — — — — — — 40.0% -0.20 1–0 0–1 — -0.14 — — — — — — — — — — — — — — — —
Career — 1954 139.0 — — — — -28 -1 +15 49.4% -0.01 63–51 (55%) 22–24 (48%) 101.7 -6.89 — 1890 136.2 — — — — -13 -69 -49 48.6% -0.10 35–44 (44%) 24–23 (51%) 101.2 +1.47

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.