H2H data updated: 2026-10-30 00:00 UTC

Mary Lou Piatek vs Ilana Kloss H2H: 1-0

Mary Lou Piatek holds a 1–0 lead over Ilana Kloss 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 1979 US Open round of 64 6-3 6-2.

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Mary Lou Piatek
USA
H2H
1 – 0
1 main-draw meetings
Ilana Kloss
RSA Age 70 Left-Handed 164 cm / 5'5"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Mary Lou Piatek 6-3 6-2 Ilana Kloss Match data Aug 31, 1979* R64 US Open Grand Slam 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
Mary Lou Piatek — — — 1,938 157 207 43.1% 0 0 0 0 2 2
Ilana Kloss — — — 1,890 135 145 48.2% 0 0 0 0 8 8

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 Ilana Kloss
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
1978 0–1 0.0% — 1,499 0 0 1970 0–1 0.0% — 1,491 0 0
1979 3–5 37.5% — 1,547 0 0 1971 5–4 55.6% — 1,561 0 1
1980 20–13 60.6% — 1,762 0 0 1972 13–12 52.0% — 1,592 0 3
1981 30–22 57.7% — 1,874 0 1 1973 38–18 67.9% — 1,872 0 8
1982 18–21 46.2% — 1,793 0 1 1974 19–16 54.3% — 1,801 0 8
1983 12–20 37.5% — 1,721 0 1 1975 9–20 31.0% — 1,688 0 8
1984 18–20 47.4% — 1,704 0 2 1976 18–15 54.5% — 1,785 0 8
1985 14–18 43.8% — 1,678 0 2 1977 4–13 23.5% — 1,668 0 8
1986 8–15 34.8% — 1,618 0 2 1978 14–11 56.0% — 1,741 0 8
1987 6–12 33.3% — 1,594 0 2 1979 15–26 36.6% — 1,699 0 8
1988 6–16 27.3% — 1,542 0 2 1980 0–8 0.0% — 1,605 0 8
1989 7–15 31.8% — 1,592 0 2 1982 0–1 0.0% — 1,586 0 8
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.

Mary Lou Piatek Ilana Kloss
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% 1970 0 1 1 0.0% — — — — — — — — — — — —
1979 1 1 2 50.0% 0 1 1 0.0% — — — — 2 3 5 40.0% 1971 5 4 9 55.6% — — — — — — — — — — — —
1980 5 3 8 62.5% 3 1 4 75.0% 0 2 2 0.0% 12 7 19 63.2% 1972 8 7 15 53.3% 0 1 1 0.0% 3 4 7 42.9% — — — —
1981 15 5 20 75.0% 6 4 10 60.0% 4 6 10 40.0% 5 7 12 41.7% 1973 15 6 21 71.4% 14 7 21 66.7% 9 5 14 64.3% — — — —
1982 4 5 9 44.4% 0 3 3 0.0% 1 2 3 33.3% 13 11 24 54.2% 1974 8 5 13 61.5% 3 4 7 42.9% 2 3 5 40.0% 2 2 4 50.0%
1983 5 6 11 45.5% 1 4 5 20.0% 0 2 2 0.0% 6 8 14 42.9% 1975 1 9 10 10.0% 1 2 3 33.3% 1 2 3 33.3% 2 6 8 25.0%
1984 9 8 17 52.9% 0 1 1 0.0% 5 6 11 45.5% 4 5 9 44.4% 1976 3 2 5 60.0% 9 8 17 52.9% 5 4 9 55.6% 1 1 2 50.0%
1985 7 11 18 38.9% 2 1 3 66.7% 1 2 3 33.3% 4 4 8 50.0% 1977 1 1 2 50.0% 1 6 7 14.3% 2 2 4 50.0% 0 4 4 0.0%
1986 5 5 10 50.0% 0 2 2 0.0% 1 2 3 33.3% 2 6 8 25.0% 1978 4 4 8 50.0% — — — — 9 4 13 69.2% 1 3 4 25.0%
1987 3 5 8 37.5% 0 2 2 0.0% 0 2 2 0.0% 3 3 6 50.0% 1979 2 7 9 22.2% 1 4 5 20.0% 4 5 9 44.4% 8 10 18 44.4%
1988 4 9 13 30.8% 1 4 5 20.0% 0 1 1 0.0% 1 2 3 33.3% 1980 0 1 1 0.0% 0 2 2 0.0% 0 2 2 0.0% 0 3 3 0.0%
1989 7 9 16 43.8% 0 3 3 0.0% 0 2 2 0.0% 0 1 1 0.0% 1982 — — — — — — — — 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 75 85 160 46.9% 17 32 49 34.7% 12 29 41 29.3% 53 61 114 46.5% Career 47 47 94 50.0% 29 34 63 46.0% 35 32 67 52.2% 14 29 43 32.6%

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 Ilana Kloss
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 1970 1491 97.3 — — — — — — — 0.0% -4.50 — — — +0.01
1979 1547 118.3 — — — — +98 — — 42.1% -0.89 1–2 (33%) 0–1 — +0.12 1971 1562 111.3 — — — — +63 — — 57.9% +0.26 0–1 0–1 — +1.35
1980 1763 137.4 — — — — +9 -186 — 57.7% +0.61 4–3 (57%) 3–0 (100%) — +0.65 1972 1593 123.4 — — — — +46 — -33 54.5% +0.64 1–4 (20%) 0–2 — +3.97
1981 1875 146.3 — — — — +65 -198 -301 56.7% +0.48 8–10 (44%) 6–5 (55%) 100.9 -2.75 1973 1872 144.6 — — — — -17 -132 -190 66.4% +1.36 7–9 (44%) 2–1 (67%) 101.0 +4.65
1982 1794 142.2 — — — — +59 -196 -212 47.1% -0.08 4–5 (44%) 2–3 (40%) 96.6 -0.89 1974 1802 136.3 — — — — +25 -83 -116 52.2% +0.16 1–4 (20%) 2–1 (67%) 97.5 -2.24
1983 1722 143.9 — — — — +55 -87 — 41.3% -0.43 4–7 (36%) 0–5 (0%) 91.3 -4.11 1975 1688 127.3 — — — — -12 -4 -4 36.4% -0.99 2–8 (20%) 3–5 (38%) 91.8 -1.35
1984 1704 128.6 — — — — -14 — -70 47.7% -0.47 5–5 (50%) 4–3 (57%) 100.9 -0.88 1976 1785 138.9 — — — — -89 -30 -55 50.6% +0.13 8–3 (73%) 3–2 (60%) 108.5 -2.55
1985 1678 113.9 — — — — -28 -65 -67 43.1% -0.61 5–3 (63%) 1–3 (25%) 100.7 +1.98 1977 1668 111.1 — — — — -42 +3 +35 28.2% -1.69 2–3 (40%) 2–1 (67%) 99.1 -0.31
1986 1619 111.1 — — — — +10 — -25 38.5% -0.67 2–4 (33%) 0–3 (0%) 95.5 +1.45 1978 1741 124.4 — — — — -84 — +34 55.9% +0.24 4–5 (44%) 5–6 (45%) 100.4 +1.14
1987 1595 117.3 — — — — +33 — — 35.7% -0.78 3–3 (50%) 0–1 — +0.12 1979 1700 127.2 — — — — -31 -53 +29 36.8% -1.15 10–5 (67%) 7–2 (78%) 110.6 -0.20
1988 1543 116.2 — — — — +33 -44 — 30.8% -1.31 4–4 (50%) 0–2 — -0.58 1980 1605 102.3 — — — — -47 — — 5.9% -3.18 0–1 0–2 — -0.55
1989 1593 121.4 — — — — +35 -117 — 31.4% -1.65 5–2 (71%) 4–2 (67%) 107.3 -2.73 1982 1586 97.0 — — — — — — — 33.3% -2.67 0–1 — — +0.16
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 1938 136.6 — — — — +26 -129 -156 44.3% -0.42 47–56 (46%) 21–34 (38%) 92.7 -2.59 Career 1890 136.2 — — — — -13 -69 -49 48.6% -0.10 35–44 (44%) 24–23 (51%) 101.2 +1.47

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.