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

Isabelle Villiger vs Mary Lou Piatek H2H: 0-1

Mary Lou Piatek holds a 1–0 lead over Isabelle Villiger in their WTA head-to-head. Across 1 main-draw meeting, Mary Lou Piatek leads 1–0 on carpet. Most recently, Mary Lou Piatek won the 1981 Chicago round of 64 6-0 5-7 6-2.

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

Isabelle Villiger
SUI Age 74
H2H
0 – 1
1 main-draw meetings
Mary Lou Piatek
USA

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Mary Lou Piatek 6-0 5-7 6-2 Isabelle Villiger Match data Jan 28, 1981* R64 Chicago WTA 250 Carpet

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
Isabelle Villiger — — — 1,688 24 31 43.6% 0 0 0 0 1 1
Mary Lou Piatek — — — 1,938 157 207 43.1% 0 0 0 0 2 2

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.

Isabelle Villiger Mary Lou Piatek
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
1972 0–1 0.0% — 1,484 0 0 1978 0–1 0.0% — 1,499 0 0
1978 2–2 50.0% — 1,499 0 0 1979 3–5 37.5% — 1,547 0 0
1979 0–2 0.0% — 1,477 0 0 1980 20–13 60.6% — 1,762 0 0
1980 13–6 68.4% — 1,645 0 1 1981 30–22 57.7% — 1,874 0 1
1981 9–16 36.0% — 1,642 0 1 1982 18–21 46.2% — 1,793 0 1
1982 0–3 0.0% — 1,597 0 1 1983 12–20 37.5% — 1,721 0 1
1983 0–1 0.0% — 1,584 0 1 1984 18–20 47.4% — 1,704 0 2
— — — — — — — 1985 14–18 43.8% — 1,678 0 2
— — — — — — — 1986 8–15 34.8% — 1,618 0 2
— — — — — — — 1987 6–12 33.3% — 1,594 0 2
— — — — — — — 1988 6–16 27.3% — 1,542 0 2
— — — — — — — 1989 7–15 31.8% — 1,592 0 2
— — — — — — — 1990 8–11 42.1% — 1,611 0 2
— — — — — — — 1991 5–8 38.5% — 1,629 0 2
— — — — — — — 1992 1–8 11.1% — 1,560 0 2
— — — — — — — 1993 1–2 33.3% — 1,554 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.

Isabelle Villiger Mary Lou Piatek
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 %
1972 — — — — 0 1 1 0.0% — — — — — — — — 1978 — — — — — — — — — — — — 0 1 1 0.0%
1978 — — — — 2 2 4 50.0% — — — — — — — — 1979 1 1 2 50.0% 0 1 1 0.0% — — — — 2 3 5 40.0%
1979 — — — — 0 1 1 0.0% 0 1 1 0.0% — — — — 1980 5 3 8 62.5% 3 1 4 75.0% 0 2 2 0.0% 12 7 19 63.2%
1980 — — — — 8 3 11 72.7% — — — — 5 3 8 62.5% 1981 15 5 20 75.0% 6 4 10 60.0% 4 6 10 40.0% 5 7 12 41.7%
1981 — — — — 7 7 14 50.0% 0 4 4 0.0% 2 5 7 28.6% 1982 4 5 9 44.4% 0 3 3 0.0% 1 2 3 33.3% 13 11 24 54.2%
1982 — — — — 0 3 3 0.0% — — — — — — — — 1983 5 6 11 45.5% 1 4 5 20.0% 0 2 2 0.0% 6 8 14 42.9%
1983 — — — — 0 1 1 0.0% — — — — — — — — 1984 9 8 17 52.9% 0 1 1 0.0% 5 6 11 45.5% 4 5 9 44.4%
— — — — — — — — — — — — — — — — — 1985 7 11 18 38.9% 2 1 3 66.7% 1 2 3 33.3% 4 4 8 50.0%
— — — — — — — — — — — — — — — — — 1986 5 5 10 50.0% 0 2 2 0.0% 1 2 3 33.3% 2 6 8 25.0%
— — — — — — — — — — — — — — — — — 1987 3 5 8 37.5% 0 2 2 0.0% 0 2 2 0.0% 3 3 6 50.0%
— — — — — — — — — — — — — — — — — 1988 4 9 13 30.8% 1 4 5 20.0% 0 1 1 0.0% 1 2 3 33.3%
— — — — — — — — — — — — — — — — — 1989 7 9 16 43.8% 0 3 3 0.0% 0 2 2 0.0% 0 1 1 0.0%
— — — — — — — — — — — — — — — — — 1990 4 5 9 44.4% 3 3 6 50.0% 0 1 1 0.0% 1 2 3 33.3%
— — — — — — — — — — — — — — — — — 1991 5 5 10 50.0% 0 2 2 0.0% — — — — 0 1 1 0.0%
— — — — — — — — — — — — — — — — — 1992 0 6 6 0.0% 1 1 2 50.0% 0 1 1 0.0% — — — —
— — — — — — — — — — — — — — — — — 1993 1 2 3 33.3% — — — — — — — — — — — —
Career — — — — 17 18 35 48.6% 0 5 5 0.0% 7 8 15 46.7% Career 75 85 160 46.9% 17 32 49 34.7% 12 29 41 29.3% 53 61 114 46.5%

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.

Isabelle Villiger Mary Lou Piatek
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
1972 1484 — — — — — — — — — — — — — +0.25 1978 1499 106.9 — — — — — — — 0.0% -3.50 — — — -0.11
1978 1500 101.6 — — — — — +18 — 50.0% -0.25 — — — +0.23 1979 1547 118.3 — — — — +98 — — 42.1% -0.89 1–2 (33%) 0–1 — +0.12
1979 1478 100.1 — — — — — — — 0.0% -3.00 — — — +0.24 1980 1763 137.4 — — — — +9 -186 — 57.7% +0.61 4–3 (57%) 3–0 (100%) — +0.65
1980 1645 121.5 — — — — -20 +2 — 66.7% +0.77 1–2 (33%) 1–1 — +2.61 1981 1875 146.3 — — — — +65 -198 -301 56.7% +0.48 8–10 (44%) 6–5 (55%) 100.9 -2.75
1981 1643 119.7 — — — — -5 +41 -130 40.0% -1.27 4–6 (40%) 4–1 (80%) 100.8 -0.55 1982 1794 142.2 — — — — +59 -196 -212 47.1% -0.08 4–5 (44%) 2–3 (40%) 96.6 -0.89
1982 1597 102.7 — — — — — +7 — 14.3% -2.00 0–1 0–1 — -0.11 1983 1722 143.9 — — — — +55 -87 — 41.3% -0.43 4–7 (36%) 0–5 (0%) 91.3 -4.11
1983 1584 — — — — — — — — — — — — — +0.29 1984 1704 128.6 — — — — -14 — -70 47.7% -0.47 5–5 (50%) 4–3 (57%) 100.9 -0.88
— — — — — — — — — — — — — — — — 1985 1678 113.9 — — — — -28 -65 -67 43.1% -0.61 5–3 (63%) 1–3 (25%) 100.7 +1.98
— — — — — — — — — — — — — — — — 1986 1619 111.1 — — — — +10 — -25 38.5% -0.67 2–4 (33%) 0–3 (0%) 95.5 +1.45
— — — — — — — — — — — — — — — — 1987 1595 117.3 — — — — +33 — — 35.7% -0.78 3–3 (50%) 0–1 — +0.12
— — — — — — — — — — — — — — — — 1988 1543 116.2 — — — — +33 -44 — 30.8% -1.31 4–4 (50%) 0–2 — -0.58
— — — — — — — — — — — — — — — — 1989 1593 121.4 — — — — +35 -117 — 31.4% -1.65 5–2 (71%) 4–2 (67%) 107.3 -2.73
— — — — — — — — — — — — — — — — 1990 1612 125.3 — — — — +7 -86 — 43.9% -0.63 1–2 (33%) 0–2 — -0.44
— — — — — — — — — — — — — — — — 1991 1630 119.5 — — — — +17 — — 41.4% -0.31 1–2 (33%) 0–2 — -0.69
— — — — — — — — — — — — — — — — 1992 1560 101.4 — — — — -16 — — 23.8% -2.00 0–3 (0%) 0–2 — -0.39
— — — — — — — — — — — — — — — — 1993 1555 103.2 — — — — -21 — — 42.9% -0.71 0–1 1–0 — -0.16
Career 1688 119.3 — — — — -13 +22 -130 46.5% -0.64 5–9 (36%) 5–3 (63%) 98.6 +5.38 Career 1938 136.6 — — — — +26 -129 -156 44.3% -0.42 47–56 (46%) 21–34 (38%) 92.7 -2.59

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.