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

Betsy Nagelsen vs Mary Lou Piatek H2H: 1-8 (incl. walkovers)

Betsy Nagelsen vs Mary Lou Piatek: 1–7 excluding walkovers; 1–8 including 1 walkover. Across 9 main-draw results including walkovers, Mary Lou Piatek leads 4–0 on hard courts and 3–0 on carpet. Most recently, Mary Lou Piatek won the 1986 Tulsa round of 16 6-4 7-5.

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Betsy Nagelsen
USA Age 69 Right-Handed 175 cm / 5'9"
H2H including walkovers
1 – 8
9 main-draw results
Mary Lou Piatek
USA

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Mary Lou Piatek 6-4 7-5 Betsy Nagelsen #34 Match data Sep 26, 1986* R16 Tulsa WTA 250 Hard
Mary Lou Piatek 6-4 6-2 Betsy Nagelsen #71 Match data Nov 21, 1984* R64 Sydney International WTA 500 Grass
Mary Lou Piatek 7-5 6-2 Betsy Nagelsen Match data Aug 13, 1982* R16 Atlanta WTA 250 Hard
Betsy Nagelsen 7-5 6-1 Mary Lou Piatek Match data Dec 4, 1981* R64 Australian Open Grand Slam Grass
Mary Lou Piatek 6-2 6-1 Betsy Nagelsen Match data Oct 15, 1981* R32 Deerfield Beach WTA 250 Hard
Mary Lou Piatek 7-5 4-6 6-3 Betsy Nagelsen Match data Aug 15, 1981* SF Richmond WTA 250 Hard
Mary Lou Piatek (w/o) Betsy Nagelsen Match data Mar 13, 1981* R16 Dallas WTA 250 Carpet
Mary Lou Piatek 6-0 6-0 Betsy Nagelsen Match data Jul 26, 1980* SF Richmond WTA 250 Carpet
Mary Lou Piatek 6-3 6-2 Betsy Nagelsen Match data Feb 20, 1980* R64 Detroit 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
Betsy Nagelsen #692 #25 28 1,890 266 324 45.1% 0 0 0 0 6 6
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.

Betsy Nagelsen Mary Lou Piatek
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
1972 4–2 66.7% — 1,511 0 1 1978 0–1 0.0% — 1,499 0 0
1973 1–3 25.0% — 1,494 0 1 1979 3–5 37.5% — 1,546 0 0
1974 27–18 60.0% — 1,724 0 3 1980 16–12 57.1% — 1,734 0 0
1975 18–17 51.4% — 1,790 0 3 1981 30–22 57.7% — 1,869 0 1
1976 11–19 36.7% — 1,709 0 3 1982 18–21 46.2% — 1,791 0 1
1977 8–15 34.8% — 1,678 0 3 1983 12–20 37.5% — 1,720 0 1
1978 13–24 35.1% — 1,659 0 3 1984 18–20 47.4% — 1,703 0 2
1979 18–19 48.6% — 1,694 0 5 1985 14–18 43.8% — 1,677 0 2
1980 22–27 44.9% — 1,753 0 5 1986 8–15 34.8% — 1,618 0 2
1981 20–21 48.8% — 1,806 0 6 1987 6–12 33.3% — 1,594 0 2
1982 12–17 41.4% — 1,705 0 6 1988 6–16 27.3% — 1,542 0 2
1983 18–22 45.0% — 1,692 0 6 1989 7–15 31.8% — 1,592 0 2
1984 11–18 37.9% #77 1,630 0 6 1990 8–11 42.1% — 1,611 0 2
1985 14–12 53.8% #81 1,713 0 6 1991 5–8 38.5% — 1,629 0 2
1986 18–17 51.4% #46 1,699 0 6 1992 1–8 11.1% — 1,559 0 2
1987 13–15 46.4% #61 1,645 0 6 1993 1–2 33.3% — 1,554 0 2
1988 11–19 36.7% #109 1,585 0 6 — — — — — — —
1989 18–15 54.5% #45 1,662 0 6 — — — — — — —
1990 8–12 40.0% #96 1,639 0 6 — — — — — — —
1991 0–2 0.0% #337 1,607 0 6 — — — — — — —
1992 1–5 16.7% #418 1,561 0 6 — — — — — — —
1993 0–4 0.0% #394 1,510 0 6 — — — — — — —
1994 0–1 0.0% #692 1,509 0 6 — — — — — — —

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.

Betsy Nagelsen 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 — — — — 2 1 3 66.7% 0 1 1 0.0% — — — — 1978 — — — — — — — — — — — — 0 1 1 0.0%
1973 1 1 2 50.0% 0 2 2 0.0% — — — — — — — — 1979 1 1 2 50.0% 0 1 1 0.0% — — — — 2 3 5 40.0%
1974 3 2 5 60.0% 6 6 12 50.0% 13 6 19 68.4% 0 4 4 0.0% 1980 5 3 8 62.5% 3 1 4 75.0% 0 2 2 0.0% 8 6 14 57.1%
1975 5 5 10 50.0% 6 5 11 54.5% 2 3 5 40.0% 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%
1976 0 2 2 0.0% 5 11 16 31.3% 3 3 6 50.0% 3 3 6 50.0% 1982 4 5 9 44.4% 0 3 3 0.0% 1 2 3 33.3% 13 11 24 54.2%
1977 3 3 6 50.0% 1 4 5 20.0% 3 5 8 37.5% 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%
1978 3 7 10 30.0% 4 6 10 40.0% 5 5 10 50.0% 1 6 7 14.3% 1984 9 8 17 52.9% 0 1 1 0.0% 5 6 11 45.5% 4 5 9 44.4%
1979 4 7 11 36.4% 0 2 2 0.0% 4 4 8 50.0% 2 6 8 25.0% 1985 7 11 18 38.9% 2 1 3 66.7% 1 2 3 33.3% 4 4 8 50.0%
1980 7 7 14 50.0% 0 2 2 0.0% 10 7 17 58.8% 5 11 16 31.3% 1986 5 5 10 50.0% 0 2 2 0.0% 1 2 3 33.3% 2 6 8 25.0%
1981 5 6 11 45.5% 1 4 5 20.0% 11 4 15 73.3% 3 7 10 30.0% 1987 3 5 8 37.5% 0 2 2 0.0% 0 2 2 0.0% 3 3 6 50.0%
1982 2 4 6 33.3% 2 3 5 40.0% 3 3 6 50.0% 5 7 12 41.7% 1988 4 9 13 30.8% 1 4 5 20.0% 0 1 1 0.0% 1 2 3 33.3%
1983 2 7 9 22.2% 2 5 7 28.6% 4 5 9 44.4% 7 4 11 63.6% 1989 7 9 16 43.8% 0 3 3 0.0% 0 2 2 0.0% 0 1 1 0.0%
1984 9 7 16 56.3% 0 4 4 0.0% 2 7 9 22.2% — — — — 1990 4 5 9 44.4% 3 3 6 50.0% 0 1 1 0.0% 1 2 3 33.3%
1985 6 5 11 54.5% 0 1 1 0.0% 7 5 12 58.3% 1 1 2 50.0% 1991 5 5 10 50.0% 0 2 2 0.0% — — — — 0 1 1 0.0%
1986 6 10 16 37.5% 0 1 1 0.0% 7 3 10 70.0% 5 3 8 62.5% 1992 0 6 6 0.0% 1 1 2 50.0% 0 1 1 0.0% — — — —
1987 8 6 14 57.1% — — — — 5 5 10 50.0% 0 4 4 0.0% 1993 1 2 3 33.3% — — — — — — — — — — — —
1988 5 13 18 27.8% — — — — 4 5 9 44.4% 2 1 3 66.7% — — — — — — — — — — — — — — — — —
1989 12 10 22 54.5% — — — — 6 3 9 66.7% 0 2 2 0.0% — — — — — — — — — — — — — — — — —
1990 3 7 10 30.0% 0 2 2 0.0% 5 3 8 62.5% — — — — — — — — — — — — — — — — — — — — —
1991 — — — — — — — — 0 2 2 0.0% — — — — — — — — — — — — — — — — — — — — —
1992 0 2 2 0.0% — — — — 1 1 2 50.0% 0 2 2 0.0% — — — — — — — — — — — — — — — — —
1993 0 2 2 0.0% — — — — — — — — 0 2 2 0.0% — — — — — — — — — — — — — — — — —
1994 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Career 84 114 198 42.4% 29 59 88 33.0% 95 80 175 54.3% 35 67 102 34.3% 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.

Betsy Nagelsen 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 1511 98.7 — — — — — +28 — 53.8% +0.23 2–1 (67%) 1–1 — +0.77 1978 1499 106.8 — — — — — — — 0.0% -3.50 — — — -0.12
1973 1495 98.7 — — — — — — — 40.0% -1.00 0–2 1–0 — +0.55 1979 1547 118.2 — — — — +97 — — 42.1% -0.89 1–2 (33%) 0–1 — +0.14
1974 1725 133.0 — — — — -176 -202 +77 57.7% +0.46 8–6 (57%) 5–6 (45%) 103.4 +0.58 1980 1735 137.7 — — — — +8 -158 — 55.7% +0.51 3–2 (60%) 1–0 — -0.18
1975 1791 125.1 — — — — -124 -166 -38 45.7% -0.44 4–4 (50%) 3–3 (50%) 101.5 -3.05 1981 1869 146.1 — — — — +63 -192 -295 56.7% +0.48 8–10 (44%) 6–5 (55%) 101.1 -3.04
1976 1709 124.2 — — — — -65 -116 +70 41.4% -0.76 3–7 (30%) 1–1 — -1.73 1982 1792 141.6 — — — — +56 -194 -210 47.1% -0.08 4–5 (44%) 2–3 (40%) 96.7 -0.75
1977 1678 123.8 — — — — -30 -105 +46 37.9% -0.62 6–6 (50%) 1–2 (33%) — +0.05 1983 1721 143.7 — — — — +53 -86 — 41.3% -0.43 4–7 (36%) 0–5 (0%) 91.3 -3.81
1978 1659 129.6 — — — — -99 -85 +99 40.7% -0.58 4–10 (29%) 3–7 (30%) 92.4 -0.84 1984 1703 128.4 — — — — -13 — -69 47.7% -0.47 5–5 (50%) 4–3 (57%) 101.0 -0.69
1979 1695 122.8 — — — — -132 — +12 48.9% +0.08 8–8 (50%) 1–3 (25%) 98.5 +1.65 1985 1678 113.6 — — — — -29 -65 -67 43.1% -0.61 5–3 (63%) 1–3 (25%) 100.7 +2.10
1980 1753 130.7 — — — — -148 — +40 47.9% -0.41 7–12 (37%) 6–2 (75%) 102.2 -1.78 1986 1618 111.0 — — — — +10 — -24 38.5% -0.67 2–4 (33%) 0–3 (0%) 95.5 +1.60
1981 1806 134.9 — — — — -129 -305 +99 49.5% -0.18 8–7 (53%) 5–5 (50%) 103.7 -3.53 1987 1594 117.2 — — — — +33 — — 35.7% -0.78 3–3 (50%) 0–1 — +0.29
1982 1705 123.2 — — — — -99 -214 +170 47.3% -0.34 5–11 (31%) 9–3 (75%) 100.0 -0.40 1988 1542 116.2 — — — — +33 -43 — 30.8% -1.31 4–4 (50%) 0–2 — -0.55
1983 1693 126.7 — — — — -32 -138 +114 46.3% -0.46 7–8 (47%) 7–6 (54%) 102.2 +0.98 1989 1592 121.3 — — — — +35 -116 — 31.4% -1.65 5–2 (71%) 4–2 (67%) 107.3 -2.88
1984 1631 126.4 — — — — +59 -141 +117 41.4% -0.51 5–7 (42%) 7–3 (70%) 99.2 +0.69 1990 1611 125.3 — — — — +8 -85 — 43.9% -0.63 1–2 (33%) 0–2 — -0.44
1985 1714 129.5 — — — — -26 — +87 54.2% +0.36 7–4 (64%) 1–2 (33%) — +1.17 1991 1630 119.4 — — — — +17 — — 41.4% -0.31 1–2 (33%) 0–2 — -0.69
1986 1699 131.1 — — — — -55 — +171 51.8% +0.01 6–7 (46%) 4–3 (57%) 98.8 +1.66 1992 1560 101.4 — — — — -16 — — 23.8% -2.00 0–3 (0%) 0–2 — -0.39
1987 1646 121.6 — — — — -24 — +148 46.2% 0.00 5–6 (45%) 4–5 (44%) 97.1 +1.69 1993 1555 103.2 — — — — -22 — — 42.9% -0.71 0–1 1–0 — -0.16
1988 1586 116.1 — — — — -27 — +128 42.5% -0.27 4–9 (31%) 5–8 (38%) 93.3 +1.55 — — — — — — — — — — — — — — — —
1989 1662 126.0 — — — — -56 — +96 50.6% +0.04 11–6 (65%) 3–4 (43%) 105.8 +1.48 — — — — — — — — — — — — — — — —
1990 1640 115.0 — — — — -81 — +173 40.0% -0.60 3–2 (60%) 2–4 (33%) 100.0 +0.09 — — — — — — — — — — — — — — — —
1991 1608 97.2 — — — — — — — 20.0% -2.40 0–1 — — -0.01 — — — — — — — — — — — — — — — —
1992 1561 105.4 — — — — -52 — — 26.7% -1.67 1–2 (33%) 1–0 — +0.03 — — — — — — — — — — — — — — — —
1993 1511 98.5 — — — — -47 — — 20.0% -2.70 0–2 0–1 — +0.17 — — — — — — — — — — — — — — — —
1994 1509 102.5 — — — — — — — 0.0% -5.50 — — — -0.16 — — — — — — — — — — — — — — — —
Career 1891 131.9 — — — — -73 -148 +94 46.5% -0.28 104–128 (45%) 70–69 (50%) 101.1 +0.27 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.