H2H data updated: 2026-10-28 00:00 UTC

Mary Lou Piatek vs Mareen Louie Harper H2H: 0-3

Mareen Louie Harper holds a 3–0 lead over Mary Lou Piatek in their WTA head-to-head. Across 3 main-draw meetings, Mareen Louie Harper leads 1–0 on carpet and 1–0 on clay. Most recently, Mareen Louie Harper won the 1985 Hershey round of 32 6-4 6-3.

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Mary Lou Piatek
USA
H2H
0 – 3
3 main-draw meetings
Mareen Louie Harper
USA Age 66

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Mareen Louie Harper 6-4 6-3 Mary Lou Piatek Match data Feb 28, 1985* R32 Hershey WTA 250 Hard
Mareen Louie Harper 1-6 6-3 6-4 Mary Lou Piatek Match data Apr 22, 1982* R32 Amelia Island Championships WTA 250 Clay
Mareen Louie Harper 6-4 7-5 Mary Lou Piatek Match data Dec 19, 1980* R16 Tucson 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
Mary Lou Piatek — — — 1,938 157 207 43.1% 0 0 0 0 2 2
Mareen Louie Harper — — — 1,911 179 240 42.7% 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.

Mary Lou Piatek Mareen Louie Harper
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
1978 0–1 0.0% — 1,499 0 0 1974 2–1 66.7% — 1,523 0 0
1979 3–5 37.5% — 1,547 0 0 1976 1–2 33.3% — 1,521 0 0
1980 20–13 60.6% — 1,762 0 0 1977 0–2 0.0% — 1,519 0 0
1981 30–22 57.7% — 1,874 0 1 1978 9–13 40.9% — 1,599 0 0
1982 18–21 46.2% — 1,793 0 1 1979 4–13 23.5% — 1,575 0 0
1983 12–20 37.5% — 1,721 0 1 1980 22–23 48.9% — 1,719 0 0
1984 18–20 47.4% — 1,704 0 2 1981 16–20 44.4% — 1,745 0 0
1985 14–18 43.8% — 1,678 0 2 1982 9–18 33.3% — 1,656 0 0
1986 8–15 34.8% — 1,618 0 2 1983 7–10 41.2% — 1,672 0 0
1987 6–12 33.3% — 1,594 0 2 1984 18–17 51.4% — 1,734 0 1
1988 6–16 27.3% — 1,542 0 2 1985 29–18 61.7% — 1,777 0 2
1989 7–15 31.8% — 1,592 0 2 1986 12–17 41.4% — 1,680 0 2
1990 8–11 42.1% — 1,611 0 2 1987 9–16 36.0% — 1,623 0 2
1991 5–8 38.5% — 1,629 0 2 1988 12–17 41.4% — 1,613 0 2
1992 1–8 11.1% — 1,560 0 2 1989 6–14 30.0% — 1,576 0 2
1993 1–2 33.3% — 1,554 0 2 1990 10–15 40.0% — 1,590 0 2
— — — — — — — 1991 12–16 42.9% — 1,614 0 2
— — — — — — — 1992 1–7 12.5% — 1,545 0 2
— — — — — — — 1994 0–1 0.0% — 1,537 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.

Mary Lou Piatek Mareen Louie Harper
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 %
1978 — — — — — — — — — — — — 0 1 1 0.0% 1974 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% 1 1 2 50.0% — — — —
1980 5 3 8 62.5% 3 1 4 75.0% 0 2 2 0.0% 12 7 19 63.2% 1977 — — — — 0 1 1 0.0% — — — — 0 1 1 0.0%
1981 15 5 20 75.0% 6 4 10 60.0% 4 6 10 40.0% 5 7 12 41.7% 1978 6 6 12 50.0% 3 3 6 50.0% — — — — 0 4 4 0.0%
1982 4 5 9 44.4% 0 3 3 0.0% 1 2 3 33.3% 13 11 24 54.2% 1979 2 6 8 25.0% 0 1 1 0.0% 0 1 1 0.0% 2 5 7 28.6%
1983 5 6 11 45.5% 1 4 5 20.0% 0 2 2 0.0% 6 8 14 42.9% 1980 7 8 15 46.7% 3 2 5 60.0% 5 2 7 71.4% 7 11 18 38.9%
1984 9 8 17 52.9% 0 1 1 0.0% 5 6 11 45.5% 4 5 9 44.4% 1981 5 7 12 41.7% 1 1 2 50.0% 1 2 3 33.3% 9 10 19 47.4%
1985 7 11 18 38.9% 2 1 3 66.7% 1 2 3 33.3% 4 4 8 50.0% 1982 4 6 10 40.0% 2 1 3 66.7% 0 2 2 0.0% 3 9 12 25.0%
1986 5 5 10 50.0% 0 2 2 0.0% 1 2 3 33.3% 2 6 8 25.0% 1983 5 5 10 50.0% — — — — — — — — 2 5 7 28.6%
1987 3 5 8 37.5% 0 2 2 0.0% 0 2 2 0.0% 3 3 6 50.0% 1984 14 9 23 60.9% 0 1 1 0.0% 1 3 4 25.0% 3 4 7 42.9%
1988 4 9 13 30.8% 1 4 5 20.0% 0 1 1 0.0% 1 2 3 33.3% 1985 18 9 27 66.7% 0 2 2 0.0% 2 2 4 50.0% 9 5 14 64.3%
1989 7 9 16 43.8% 0 3 3 0.0% 0 2 2 0.0% 0 1 1 0.0% 1986 8 7 15 53.3% — — — — 1 2 3 33.3% 3 8 11 27.3%
1990 4 5 9 44.4% 3 3 6 50.0% 0 1 1 0.0% 1 2 3 33.3% 1987 6 8 14 42.9% 0 2 2 0.0% 2 3 5 40.0% 1 3 4 25.0%
1991 5 5 10 50.0% 0 2 2 0.0% — — — — 0 1 1 0.0% 1988 8 11 19 42.1% 1 1 2 50.0% 0 2 2 0.0% 3 3 6 50.0%
1992 0 6 6 0.0% 1 1 2 50.0% 0 1 1 0.0% — — — — 1989 3 9 12 25.0% — — — — 2 3 5 40.0% 1 2 3 33.3%
1993 1 2 3 33.3% — — — — — — — — — — — — 1990 8 10 18 44.4% — — — — 0 2 2 0.0% 2 3 5 40.0%
— — — — — — — — — — — — — — — — — 1991 9 11 20 45.0% — — — — 1 2 3 33.3% 2 3 5 40.0%
— — — — — — — — — — — — — — — — — 1992 1 5 6 16.7% — — — — — — — — 0 2 2 0.0%
— — — — — — — — — — — — — — — — — 1994 0 1 1 0.0% — — — — — — — — — — — —
Career 75 85 160 46.9% 17 32 49 34.7% 12 29 41 29.3% 53 61 114 46.5% Career 106 119 225 47.1% 10 16 26 38.5% 16 27 43 37.2% 47 78 125 37.6%

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.

Mary Lou Piatek Mareen Louie Harper
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
1978 1499 106.9 — — — — — — — 0.0% -3.50 — — — -0.11 1974 1524 102.4 — — — — +72 — — 57.1% +0.29 1–0 1–0 — +0.56
1979 1547 118.3 — — — — +98 — — 42.1% -0.89 1–2 (33%) 0–1 — +0.12 1976 1522 100.6 — — — — — — — 42.9% -0.57 0–1 — — +0.37
1980 1763 137.4 — — — — +9 -186 — 57.7% +0.61 4–3 (57%) 3–0 (100%) — +0.65 1977 1520 116.0 — — — — — — — 0.0% -3.50 — 0–1 — -0.35
1981 1875 146.3 — — — — +65 -198 -301 56.7% +0.48 8–10 (44%) 6–5 (55%) 100.9 -2.75 1978 1599 122.7 — — — — +32 -41 — 39.2% -0.96 5–2 (71%) 3–1 (75%) 107.4 +0.50
1982 1794 142.2 — — — — +59 -196 -212 47.1% -0.08 4–5 (44%) 2–3 (40%) 96.6 -0.89 1979 1576 121.8 — — — — +27 — — 30.0% -1.90 2–4 (33%) 2–1 (67%) — +0.40
1983 1722 143.9 — — — — +55 -87 — 41.3% -0.43 4–7 (36%) 0–5 (0%) 91.3 -4.11 1980 1719 129.4 — — — — -38 -158 -41 46.2% -0.59 12–4 (75%) 2–6 (25%) 107.4 +1.11
1984 1704 128.6 — — — — -14 — -70 47.7% -0.47 5–5 (50%) 4–3 (57%) 100.9 -0.88 1981 1746 134.8 — — — — -2 — -75 42.7% -0.51 7–5 (58%) 4–2 (67%) 104.9 -1.67
1985 1678 113.9 — — — — -28 -65 -67 43.1% -0.61 5–3 (63%) 1–3 (25%) 100.7 +1.98 1982 1656 125.3 — — — — -25 -46 — 35.5% -1.06 4–4 (50%) 1–2 (33%) 99.6 -1.44
1986 1619 111.1 — — — — +10 — -25 38.5% -0.67 2–4 (33%) 0–3 (0%) 95.5 +1.45 1983 1672 132.3 — — — — -12 — — 42.9% -0.43 2–1 (67%) 1–2 (33%) 100.3 -0.96
1987 1595 117.3 — — — — +33 — — 35.7% -0.78 3–3 (50%) 0–1 — +0.12 1984 1734 127.7 — — — — +24 — -95 48.8% -0.05 7–3 (70%) 2–3 (40%) 105.0 +0.48
1988 1543 116.2 — — — — +33 -44 — 30.8% -1.31 4–4 (50%) 0–2 — -0.58 1985 1778 143.9 — — — — +52 — -156 58.5% +0.41 8–4 (67%) 5–5 (50%) 101.8 -0.23
1989 1593 121.4 — — — — +35 -117 — 31.4% -1.65 5–2 (71%) 4–2 (67%) 107.3 -2.73 1986 1680 121.3 — — — — +20 — -64 39.1% -0.55 5–3 (63%) 2–5 (29%) 97.5 +1.36
1990 1612 125.3 — — — — +7 -86 — 43.9% -0.63 1–2 (33%) 0–2 — -0.44 1987 1624 119.6 — — — — +7 — -16 38.6% -0.67 3–4 (43%) 1–1 — +0.21
1991 1630 119.5 — — — — +17 — — 41.4% -0.31 1–2 (33%) 0–2 — -0.69 1988 1614 129.2 — — — — +12 — — 43.3% -0.43 4–5 (44%) 5–4 (56%) 100.4 -0.37
1992 1560 101.4 — — — — -16 — — 23.8% -2.00 0–3 (0%) 0–2 — -0.39 1989 1577 117.4 — — — — -17 — -22 32.0% -1.38 6–4 (60%) 6–1 (86%) 107.4 -1.28
1993 1555 103.2 — — — — -21 — — 42.9% -0.71 0–1 1–0 — -0.16 1990 1591 128.5 — — — — +9 — — 45.8% -0.14 2–7 (22%) 1–3 (25%) 94.5 +0.31
— — — — — — — — — — — — — — — — 1991 1615 127.2 — — — — -4 — -50 39.4% -0.53 8–4 (67%) 4–4 (50%) 105.2 +0.46
— — — — — — — — — — — — — — — — 1992 1545 105.5 — — — — -7 — — 25.0% -1.81 0–2 1–0 — -0.11
— — — — — — — — — — — — — — — — 1994 1537 103.8 — — — — — — — 0.0% -2.50 — 0–1 — -0.17
Career 1938 136.6 — — — — +26 -129 -156 44.3% -0.42 47–56 (46%) 21–34 (38%) 92.7 -2.59 Career 1911 135.4 — — — — +8 -84 -60 42.6% -0.56 76–57 (57%) 41–42 (49%) 107.5 -0.20

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.