H2H data updated: 2026-10-27 00:00 UTC

Sandy Collins vs Mareen Louie Harper H2H: 2-4

Mareen Louie Harper holds a 4–2 lead over Sandy Collins in their WTA head-to-head. Across 6 main-draw meetings, Mareen Louie Harper leads 2–1 on carpet and 2–1 on hard courts. Most recently, Mareen Louie Harper won the 1990 Tokyo Pan Pacific round of 32 2-6 6-4 6-2.

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Sandy Collins
USA Age 68
H2H
2 – 4
6 main-draw meetings
Mareen Louie Harper
USA Age 66

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Mareen Louie Harper 2-6 6-4 6-2 Sandy Collins Match data Feb 1, 1990* R32 Tokyo Pan Pacific Tier II → modern equivalent WTA 500 Carpet
Mareen Louie Harper 6-2 6-2 Sandy Collins Match data Mar 1, 1985* R16 Hershey WTA 250 Hard
Sandy Collins 6-3 6-2 Mareen Louie Harper Match data Aug 13, 1981* R32 Richmond WTA 250 Hard
Sandy Collins 6-4 7-6 Mareen Louie Harper Match data Feb 12, 1981* R32 Oakland WTA 250 Carpet
Mareen Louie Harper 1-6 6-4 6-4 Sandy Collins Match data Dec 20, 1980* SF Tucson WTA 250 Carpet
Mareen Louie Harper 6-3 6-2 Sandy Collins Match data Jan 6, 1978* R16 San Diego Futures WTA 250 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
Sandy Collins — — — 1,824 90 152 37.2% 0 0 0 0 0 0
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.

Age Sandy Collins Mareen Louie Harper
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
13 — — — — — — — 1974 2–1 66.7% — 1,523 0 0
14 1973 1–1 50.0% — 1,497 0 0 — — — — — — —
15 — — — — — — — 1976 1–2 33.3% — 1,521 0 0
16 — — — — — — — 1977 0–2 0.0% — 1,519 0 0
17 — — — — — — — 1978 9–13 40.9% — 1,599 0 0
18 — — — — — — — 1979 4–13 23.5% — 1,575 0 0
19 1978 7–7 50.0% — 1,541 0 0 1980 22–23 48.9% — 1,719 0 0
20 1979 2–7 22.2% — 1,498 0 0 1981 16–20 44.4% — 1,745 0 0
21 1980 10–12 45.5% — 1,632 0 0 1982 9–18 33.3% — 1,656 0 0
22 1981 25–20 55.6% — 1,787 0 0 1983 7–10 41.2% — 1,672 0 0
23 1982 14–21 40.0% — 1,734 0 0 1984 18–17 51.4% — 1,734 0 1
24 1983 13–20 39.4% — 1,684 0 0 1985 29–18 61.7% — 1,777 0 2
25 1984 9–18 33.3% — 1,600 0 0 1986 12–17 41.4% — 1,680 0 2
26 1985 1–9 10.0% — 1,508 0 0 1987 9–16 36.0% — 1,623 0 2
27 1986 0–1 0.0% — 1,500 0 0 1988 12–17 41.4% — 1,613 0 2
28 1987 0–4 0.0% — 1,453 0 0 1989 6–14 30.0% — 1,576 0 2
29 1988 3–5 37.5% — 1,491 0 0 1990 10–15 40.0% — 1,590 0 2
30 1989 2–8 20.0% — 1,473 0 0 1991 12–16 42.9% — 1,614 0 2
31 1990 1–9 10.0% — 1,421 0 0 1992 1–7 12.5% — 1,545 0 2
32 1991 1–5 16.7% — 1,406 0 0 — — — — — — —
33 1992 1–2 33.3% — 1,413 0 0 1994 0–1 0.0% — 1,537 0 2
34 1993 0–1 0.0% — 1,407 0 0 — — — — — — —
35 1994 0–2 0.0% — 1,393 0 0 — — — — — — —

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 Sandy Collins 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 %
13 — — — — — — — — — — — — — — — — — 1974 2 1 3 66.7% — — — — — — — — — — — —
14 1973 1 1 2 50.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
15 — — — — — — — — — — — — — — — — — 1976 — — — — 0 1 1 0.0% 1 1 2 50.0% — — — —
16 — — — — — — — — — — — — — — — — — 1977 — — — — 0 1 1 0.0% — — — — 0 1 1 0.0%
17 — — — — — — — — — — — — — — — — — 1978 6 6 12 50.0% 3 3 6 50.0% — — — — 0 4 4 0.0%
18 — — — — — — — — — — — — — — — — — 1979 2 6 8 25.0% 0 1 1 0.0% 0 1 1 0.0% 2 5 7 28.6%
19 1978 3 3 6 50.0% 0 1 1 0.0% 0 1 1 0.0% — — — — 1980 7 8 15 46.7% 3 2 5 60.0% 5 2 7 71.4% 7 11 18 38.9%
20 1979 0 1 1 0.0% 1 4 5 20.0% 1 1 2 50.0% 0 1 1 0.0% 1981 5 7 12 41.7% 1 1 2 50.0% 1 2 3 33.3% 9 10 19 47.4%
21 1980 4 6 10 40.0% 1 1 2 50.0% 0 1 1 0.0% 5 4 9 55.6% 1982 4 6 10 40.0% 2 1 3 66.7% 0 2 2 0.0% 3 9 12 25.0%
22 1981 4 5 9 44.4% 11 6 17 64.7% 3 2 5 60.0% 7 7 14 50.0% 1983 5 5 10 50.0% — — — — — — — — 2 5 7 28.6%
23 1982 3 2 5 60.0% 4 5 9 44.4% 0 2 2 0.0% 7 12 19 36.8% 1984 14 9 23 60.9% 0 1 1 0.0% 1 3 4 25.0% 3 4 7 42.9%
24 1983 5 6 11 45.5% 2 6 8 25.0% 2 3 5 40.0% 4 5 9 44.4% 1985 18 9 27 66.7% 0 2 2 0.0% 2 2 4 50.0% 9 5 14 64.3%
25 1984 7 6 13 53.8% 0 3 3 0.0% 0 6 6 0.0% 2 3 5 40.0% 1986 8 7 15 53.3% — — — — 1 2 3 33.3% 3 8 11 27.3%
26 1985 1 5 6 16.7% 0 1 1 0.0% 0 2 2 0.0% 0 1 1 0.0% 1987 6 8 14 42.9% 0 2 2 0.0% 2 3 5 40.0% 1 3 4 25.0%
27 1986 — — — — — — — — 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%
28 1987 0 2 2 0.0% — — — — 0 2 2 0.0% — — — — 1989 3 9 12 25.0% — — — — 2 3 5 40.0% 1 2 3 33.3%
29 1988 3 4 7 42.9% — — — — 0 1 1 0.0% — — — — 1990 8 10 18 44.4% — — — — 0 2 2 0.0% 2 3 5 40.0%
30 1989 1 5 6 16.7% — — — — 0 1 1 0.0% 1 2 3 33.3% 1991 9 11 20 45.0% — — — — 1 2 3 33.3% 2 3 5 40.0%
31 1990 0 5 5 0.0% 1 3 4 25.0% — — — — 0 1 1 0.0% 1992 1 5 6 16.7% — — — — — — — — 0 2 2 0.0%
32 1991 1 2 3 33.3% 0 1 1 0.0% 0 1 1 0.0% 0 1 1 0.0% — — — — — — — — — — — — — — — — —
33 1992 1 1 2 50.0% 0 1 1 0.0% — — — — — — — — 1994 0 1 1 0.0% — — — — — — — — — — — —
34 1993 — — — — — — — — — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — —
35 1994 0 2 2 0.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 34 56 90 37.8% 20 32 52 38.5% 6 24 30 20.0% 26 38 64 40.6% — 106 119 225 47.1% 10 16 26 38.5% 16 27 43 37.2% 47 78 125 37.6%

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 Sandy Collins 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
13 — — — — — — — — — — — — — — — — 1974 1524 102.4 — — — — +72 — — 57.1% +0.29 1–0 1–0 — +0.56
14 1973 1497 99.4 — — — — — — — 50.0% 0.00 — — — +0.62 — — — — — — — — — — — — — — — —
15 — — — — — — — — — — — — — — — — 1976 1522 100.6 — — — — — — — 42.9% -0.57 0–1 — — +0.37
16 — — — — — — — — — — — — — — — — 1977 1520 116.0 — — — — — — — 0.0% -3.50 — 0–1 — -0.35
17 — — — — — — — — — — — — — — — — 1978 1599 122.7 — — — — +32 -41 — 39.2% -0.96 5–2 (71%) 3–1 (75%) 107.4 +0.50
18 — — — — — — — — — — — — — — — — 1979 1576 121.8 — — — — +27 — — 30.0% -1.90 2–4 (33%) 2–1 (67%) — +0.40
19 1978 1541 118.0 — — — — +85 — — 56.3% +0.66 0–4 (0%) — — +1.24 1980 1719 129.4 — — — — -38 -158 -41 46.2% -0.59 12–4 (75%) 2–6 (25%) 107.4 +1.11
20 1979 1498 107.8 — — — — — -8 — 30.0% -0.55 0–2 0–1 — +1.31 1981 1746 134.8 — — — — -2 — -75 42.7% -0.51 7–5 (58%) 4–2 (67%) 104.9 -1.67
21 1980 1632 129.0 — — — — +7 — — 48.9% +0.22 3–2 (60%) 1–2 (33%) 101.5 -0.07 1982 1656 125.3 — — — — -25 -46 — 35.5% -1.06 4–4 (50%) 1–2 (33%) 99.6 -1.44
22 1981 1787 138.1 — — — — -48 -82 -188 52.6% -0.04 6–3 (67%) 5–4 (56%) 104.5 -1.55 1983 1672 132.3 — — — — -12 — — 42.9% -0.43 2–1 (67%) 1–2 (33%) 100.3 -0.96
23 1982 1734 126.6 — — — — -17 -44 — 38.7% -0.91 6–3 (67%) 2–4 (33%) 103.2 -0.37 1984 1734 127.7 — — — — +24 — -95 48.8% -0.05 7–3 (70%) 2–3 (40%) 105.0 +0.48
24 1983 1685 124.3 — — — — +34 -29 -111 40.8% -0.63 2–3 (40%) 1–5 (17%) 95.5 -0.09 1985 1778 143.9 — — — — +52 — -156 58.5% +0.41 8–4 (67%) 5–5 (50%) 101.8 -0.23
25 1984 1601 117.8 — — — — +112 -8 -91 34.4% -0.97 4–5 (44%) 1–2 (33%) 98.9 -0.22 1986 1680 121.3 — — — — +20 — -64 39.1% -0.55 5–3 (63%) 2–5 (29%) 97.5 +1.36
26 1985 1508 99.3 — — — — +102 — — 18.2% -2.36 0–2 1–0 — +0.69 1987 1624 119.6 — — — — +7 — -16 38.6% -0.67 3–4 (43%) 1–1 — +0.21
27 1986 1500 101.5 — — — — — — — 33.3% -2.33 0–1 — — -0.03 1988 1614 129.2 — — — — +12 — — 43.3% -0.43 4–5 (44%) 5–4 (56%) 100.4 -0.37
28 1987 1454 94.2 — — — — — — — 11.1% -2.56 0–1 — — +0.23 1989 1577 117.4 — — — — -17 — -22 32.0% -1.38 6–4 (60%) 6–1 (86%) 107.4 -1.28
29 1988 1491 114.4 — — — — +85 — — 42.1% -0.63 1–2 (33%) 1–3 (25%) 97.4 -0.02 1990 1591 128.5 — — — — +9 — — 45.8% -0.14 2–7 (22%) 1–3 (25%) 94.5 +0.31
30 1989 1473 103.5 — — — — +56 — — 23.8% -1.71 0–1 2–0 — +0.43 1991 1615 127.2 — — — — -4 — -50 39.4% -0.53 8–4 (67%) 4–4 (50%) 105.2 +0.46
31 1990 1422 95.6 — — — — +39 +112 — 17.4% -2.65 1–2 (33%) — — +0.17 1992 1545 105.5 — — — — -7 — — 25.0% -1.81 0–2 1–0 — -0.11
32 1991 1406 104.6 — — — — +39 — — 21.4% -2.00 1–1 0–1 — +0.16 — — — — — — — — — — — — — — — —
33 1992 1413 104.4 — — — — — — — 33.3% -0.83 — 0–1 — +0.18 1994 1537 103.8 — — — — — — — 0.0% -2.50 — 0–1 — -0.17
34 1993 1408 95.8 — — — — — — — 0.0% -5.00 — — — -0.07 — — — — — — — — — — — — — — — —
35 1994 1394 103.0 — — — — — — — 33.3% -1.33 0–2 1–1 — -0.05 — — — — — — — — — — — — — — — —
Career — 1825 126.0 — — — — +28 -36 -128 39.2% -0.75 24–34 (41%) 15–24 (38%) 92.7 +1.07 — 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.