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

Diane Desfor vs Mary Lou Piatek H2H: 0-1

Mary Lou Piatek holds a 1–0 lead over Diane Desfor in their WTA head-to-head. Across 1 main-draw meeting, Mary Lou Piatek leads 1–0 on hard courts. Most recently, Mary Lou Piatek won the 1981 San Diego round of 32 7-5 6-4.

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

Diane Desfor
USA Age 71 Right-Handed 165 cm / 5'5"
H2H
0 – 1
1 main-draw meetings
Mary Lou Piatek
USA

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Mary Lou Piatek 7-5 6-4 Diane Desfor Match data Jul 30, 1981* R32 San Diego WTA 500 Hard

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
Diane Desfor — — — 1,775 69 89 43.7% 0 0 0 0 2 2
Mary Lou Piatek — — — 1,931 153 206 42.6% 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.

Diane Desfor Mary Lou Piatek
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
1974 1–2 33.3% — 1,482 0 0 1978 0–1 0.0% — 1,499 0 0
1975 5–3 62.5% — 1,524 0 0 1979 3–5 37.5% — 1,546 0 0
1976 4–1 80.0% — 1,580 0 1 1980 16–12 57.1% — 1,734 0 0
1977 1–1 50.0% — 1,567 0 1 1981 30–22 57.7% — 1,869 0 1
1978 14–17 45.2% — 1,641 0 1 1982 18–21 46.2% — 1,791 0 1
1979 15–22 40.5% — 1,688 0 1 1983 12–20 37.5% — 1,720 0 1
1980 18–21 46.2% — 1,648 0 1 1984 18–20 47.4% — 1,703 0 2
1981 8–17 32.0% — 1,613 0 1 1985 14–18 43.8% — 1,677 0 2
1982 3–5 37.5% — 1,586 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% — 1,559 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.

Diane Desfor 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 %
1974 — — — — 1 1 2 50.0% 0 1 1 0.0% — — — — 1978 — — — — — — — — — — — — 0 1 1 0.0%
1975 — — — — — — — — 2 1 3 66.7% — — — — 1979 1 1 2 50.0% 0 1 1 0.0% — — — — 2 3 5 40.0%
1976 — — — — 0 1 1 0.0% — — — — — — — — 1980 5 3 8 62.5% 3 1 4 75.0% 0 2 2 0.0% 8 6 14 57.1%
1978 7 6 13 53.8% 2 5 7 28.6% 2 4 6 33.3% 3 2 5 60.0% 1981 15 5 20 75.0% 6 4 10 60.0% 4 6 10 40.0% 5 7 12 41.7%
1979 5 6 11 45.5% 1 3 4 25.0% 6 7 13 46.2% 3 6 9 33.3% 1982 4 5 9 44.4% 0 3 3 0.0% 1 2 3 33.3% 13 11 24 54.2%
1980 4 9 13 30.8% 1 2 3 33.3% 12 7 19 63.2% 1 3 4 25.0% 1983 5 6 11 45.5% 1 4 5 20.0% 0 2 2 0.0% 6 8 14 42.9%
1981 1 4 5 20.0% 0 3 3 0.0% 7 7 14 50.0% 0 3 3 0.0% 1984 9 8 17 52.9% 0 1 1 0.0% 5 6 11 45.5% 4 5 9 44.4%
1982 2 2 4 50.0% 0 1 1 0.0% 0 2 2 0.0% — — — — 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 19 27 46 41.3% 5 16 21 23.8% 29 29 58 50.0% 7 14 21 33.3% Career 75 85 160 46.9% 17 32 49 34.7% 12 29 41 29.3% 49 60 109 45.0%

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.

Diane Desfor 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
1974 1483 94.1 — — — — — — — 28.6% -1.57 1–0 0–1 — +0.64 1978 1499 106.8 — — — — — — — 0.0% -3.50 — — — -0.12
1975 1525 105.5 — — — — — — +34 55.0% +0.05 3–1 (75%) 2–0 — +0.97 1979 1547 118.2 — — — — +97 — — 42.1% -0.89 1–2 (33%) 0–1 — +0.14
1976 1580 118.1 — — — — — — — 72.7% +1.91 1–0 1–0 — -0.10 1980 1735 137.7 — — — — +8 -158 — 55.7% +0.51 3–2 (60%) 1–0 — -0.18
1977 1568 99.4 — — — — — — — 60.0% +1.00 0–1 — — +0.33 1981 1869 146.1 — — — — +63 -192 -295 56.7% +0.48 8–10 (44%) 6–5 (55%) 101.1 -3.04
1978 1641 122.6 — — — — +30 -131 -97 44.6% -0.07 7–7 (50%) 3–6 (33%) 98.7 +0.61 1982 1792 141.6 — — — — +56 -194 -210 47.1% -0.08 4–5 (44%) 2–3 (40%) 96.7 -0.75
1979 1689 129.6 — — — — -37 -166 -73 40.2% -0.57 5–5 (50%) 2–6 (25%) 98.8 +0.12 1983 1721 143.7 — — — — +53 -86 — 41.3% -0.43 4–7 (36%) 0–5 (0%) 91.3 -3.81
1980 1649 126.4 — — — — -120 -124 +77 46.7% -0.22 6–8 (43%) 5–3 (63%) 101.5 -1.43 1984 1703 128.4 — — — — -13 — -69 47.7% -0.47 5–5 (50%) 4–3 (57%) 101.0 -0.69
1981 1614 112.5 — — — — -87 -99 +82 33.3% -1.11 2–4 (33%) — — -1.06 1985 1678 113.6 — — — — -29 -65 -67 43.1% -0.61 5–3 (63%) 1–3 (25%) 100.7 +2.10
1982 1586 105.7 — — — — -77 — — 42.1% +0.32 1–2 (33%) 0–2 — +0.83 1986 1618 111.0 — — — — +10 — -24 38.5% -0.67 2–4 (33%) 0–3 (0%) 95.5 +1.60
— — — — — — — — — — — — — — — — 1987 1594 117.2 — — — — +33 — — 35.7% -0.78 3–3 (50%) 0–1 — +0.29
— — — — — — — — — — — — — — — — 1988 1542 116.2 — — — — +33 -43 — 30.8% -1.31 4–4 (50%) 0–2 — -0.55
— — — — — — — — — — — — — — — — 1989 1592 121.3 — — — — +35 -116 — 31.4% -1.65 5–2 (71%) 4–2 (67%) 107.3 -2.88
— — — — — — — — — — — — — — — — 1990 1611 125.3 — — — — +8 -85 — 43.9% -0.63 1–2 (33%) 0–2 — -0.44
— — — — — — — — — — — — — — — — 1991 1630 119.4 — — — — +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 — — — — -22 — — 42.9% -0.71 0–1 1–0 — -0.16
Career 1775 125.0 — — — — -48 -132 +21 43.6% -0.30 26–28 (48%) 13–18 (42%) 98.7 +0.59 Career 1932 136.4 — — — — +26 -124 -154 43.9% -0.44 46–55 (46%) 19–34 (36%) 92.3 -2.67

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.