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

Fiorella Bonicelli vs Valerie Ziegenfuss H2H: 2-1

Fiorella Bonicelli holds a 2–1 lead over Valerie Ziegenfuss in their WTA head-to-head. Across 3 main-draw meetings, Fiorella Bonicelli leads 2–1 on clay. Most recently, Valerie Ziegenfuss won the 1976 Canadian Open round of 32 6-2 7-5.

Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.

Fiorella Bonicelli
URU Age 74
H2H
2 – 1
3 main-draw meetings
Valerie Ziegenfuss
USA Age 77

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Valerie Ziegenfuss 6-2 7-5 Fiorella Bonicelli Match data Aug 19, 1976* R32 Canadian Open WTA 250 Clay
Fiorella Bonicelli 6-4 6-3 Valerie Ziegenfuss Match data Jul 5, 1971* R32 Venice WTA 250 Clay
Fiorella Bonicelli 8-6 6-1 Valerie Ziegenfuss Match data Jul 25, 1969* R16 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
Fiorella Bonicelli — — — 1,868 137 98 58.3% 0 0 0 0 12 12
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 Fiorella Bonicelli Valerie Ziegenfuss
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
16 1968 1–2 33.3% — 1,509 0 0 — — — — — — —
17 1969 11–8 57.9% — 1,604 0 0 — — — — — — —
18 1970 11–5 68.8% — 1,702 0 2 — — — — — — —
19 1971 12–10 54.5% — 1,701 0 6 1968 35–24 59.3% — 1,605 0 0
20 1972 26–16 61.9% — 1,796 0 9 1969 28–24 53.8% — 1,733 0 1
21 1973 24–11 68.6% — 1,842 0 11 1970 40–28 58.8% — 1,779 0 2
22 1974 6–4 60.0% — 1,800 0 11 1971 23–29 44.2% — 1,798 0 3
23 1975 12–13 48.0% — 1,774 0 12 1972 26–24 52.0% — 1,820 0 3
24 1976 14–8 63.6% — 1,776 0 12 1973 33–29 53.2% — 1,761 0 3
25 1977 9–10 47.4% — 1,763 0 12 1974 12–14 46.2% — 1,788 0 3
26 1978 10–9 52.6% — 1,742 0 12 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 1982 0–1 0.0% — 1,728 0 12 1979 1–1 50.0% — 1,667 0 3
32 1984 1–1 50.0% — 1,717 0 12 — — — — — — —

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 Fiorella Bonicelli 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 %
16 1968 — — — — 1 2 3 33.3% — — — — — — — — — — — — — — — — — — — — — — — — —
17 1969 — — — — 8 4 12 66.7% 3 4 7 42.9% — — — — — — — — — — — — — — — — — — — — —
18 1970 — — — — 10 3 13 76.9% 1 2 3 33.3% — — — — — — — — — — — — — — — — — — — — —
19 1971 — — — — 10 7 17 58.8% 1 3 4 25.0% — — — — 1968 5 4 9 55.6% 16 9 25 64.0% 13 9 22 59.1% 1 2 3 33.3%
20 1972 0 1 1 0.0% 15 9 24 62.5% 8 6 14 57.1% — — — — 1969 5 6 11 45.5% 12 8 20 60.0% 10 8 18 55.6% 1 2 3 33.3%
21 1973 — — — — 19 8 27 70.4% 5 3 8 62.5% — — — — 1970 12 7 19 63.2% 13 8 21 61.9% 12 8 20 60.0% 2 3 5 40.0%
22 1974 — — — — 4 3 7 57.1% 2 1 3 66.7% — — — — 1971 4 6 10 40.0% 10 7 17 58.8% 6 6 12 50.0% 3 10 13 23.1%
23 1975 2 2 4 50.0% 9 9 18 50.0% 1 2 3 33.3% — — — — 1972 6 4 10 60.0% 9 7 16 56.3% 4 4 8 50.0% 7 9 16 43.8%
24 1976 — — — — 14 7 21 66.7% 0 1 1 0.0% — — — — 1973 5 6 11 45.5% 6 6 12 50.0% 8 4 12 66.7% 12 12 24 50.0%
25 1977 1 1 2 50.0% 6 8 14 42.9% 2 1 3 66.7% — — — — 1974 3 4 7 42.9% 0 1 1 0.0% 0 1 1 0.0% 9 8 17 52.9%
26 1978 — — — — 6 5 11 54.5% 0 3 3 0.0% — — — — 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 1982 — — — — 0 1 1 0.0% — — — — — — — — 1979 1 1 2 50.0% — — — — — — — — — — — —
32 1984 — — — — 1 1 2 50.0% — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 3 4 7 42.9% 103 67 170 60.6% 23 26 49 46.9% — — — — — 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 Fiorella Bonicelli 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
16 1968 1510 98.3 — — — — — — — 40.0% -0.60 1–0 — — -0.19 — — — — — — — — — — — — — — — —
17 1969 1604 117.2 — — — — — +35 -68 61.0% +0.41 0–3 (0%) — — -0.11 — — — — — — — — — — — — — — — —
18 1970 1702 116.4 — — — — — +53 -159 61.8% +0.44 3–1 (75%) — — +1.28 — — — — — — — — — — — — — — — —
19 1971 1702 122.1 — — — — — +58 -185 54.9% +0.33 3–4 (43%) — — +2.08 1968 1605 119.1 — — — — -45 +58 +13 57.4% +0.80 9–4 (69%) — — -0.64
20 1972 1796 137.0 — — — — — +57 -166 58.0% +0.53 10–6 (63%) 4–2 (67%) 105.5 -0.59 1969 1734 126.4 — — — — -175 -30 +9 51.4% +0.32 6–3 (67%) — — -2.24
21 1973 1842 136.2 — — — — — +53 -147 63.0% +0.73 8–3 (73%) 6–4 (60%) 103.3 +0.33 1970 1780 133.1 — — — — -34 -31 +26 55.6% +0.45 11–4 (73%) 0–1 — -2.50
22 1974 1800 119.7 — — — — — +33 -78 66.7% +1.33 1–2 (33%) — — +0.49 1971 1799 143.5 — — — — -114 +2 0 46.0% -0.35 5–8 (38%) 3–2 (60%) 99.7 -6.44
23 1975 1774 138.4 — — — — -137 +22 -84 51.7% +0.29 6–6 (50%) 1–3 (25%) 98.0 -2.39 1972 1821 139.7 — — — — -47 -20 -41 48.2% +0.09 9–3 (75%) 4–4 (50%) 105.3 -5.05
24 1976 1777 132.4 — — — — — +29 — 59.2% +0.84 4–1 (80%) 2–1 (67%) 103.9 -0.37 1973 1761 143.5 — — — — -2 +54 +48 54.3% +0.18 7–9 (44%) 4–5 (44%) 95.0 -5.77
25 1977 1763 128.8 — — — — — +1 -63 50.0% -0.02 2–4 (33%) 3–2 (60%) 98.6 -0.83 1974 1789 134.2 — — — — +8 — — 46.6% -0.29 3–3 (50%) 0–3 (0%) 97.0 -2.64
26 1978 1743 134.2 — — — — — +42 -82 55.8% +0.28 1–4 (20%) 2–2 (50%) 97.2 -1.32 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 1982 1728 102.7 — — — — — — — 0.0% -3.00 — — — -0.22 1979 1667 111.1 — — — — — — — 40.0% -0.20 1–0 0–1 — -0.15
32 1984 1717 101.4 — — — — — — — 50.0% +0.67 1–1 — — +0.28 — — — — — — — — — — — — — — — —
Career — 1868 138.2 — — — — -137 +40 -127 57.4% +0.47 40–35 (53%) 18–14 (56%) 102.7 -0.67 — 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.