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

Kaoru Okamoto vs Betsy Nagelsen H2H: 1-1

Kaoru Okamoto and Betsy Nagelsen are tied 1–1 in their WTA head-to-head. Across 2 main-draw meetings, they are tied 1–1 on hard courts. Most recently, Kaoru Okamoto won the 1990 Tokyo Japan Open round of 16 6-1 6-2.

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

Kaoru Okamoto
JPN Age 61 Right-Handed
H2H
1 – 1
2 main-draw meetings
Betsy Nagelsen
USA Age 70 Right-Handed 175 cm / 5'9"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Kaoru Okamoto #109 6-1 6-2 Betsy Nagelsen #47 Match data Apr 14, 1990* R16 Tokyo Japan Open Tier IV → modern equivalent WTA 250 Hard
Betsy Nagelsen #45 7-6 6-4 Kaoru Okamoto #159 Match data Apr 19, 1987* QF Tokyo Japan Open 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
Kaoru Okamoto — #75 14 1,589 23 44 34.3% 0 0 0 1 0 1
Betsy Nagelsen — #25 28 1,892 266 324 45.1% 0 0 0 0 6 6

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 Kaoru Okamoto Betsy Nagelsen
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
13 1978 0–1 0.0% — 1,483 0 0 — — — — — — —
15 1980 0–2 0.0% — 1,465 0 0 1972 4–2 66.7% — 1,511 0 1
16 1981 0–3 0.0% — 1,441 0 0 1973 1–3 25.0% — 1,494 0 1
17 — — — — — — — 1974 27–18 60.0% — 1,724 0 3
18 1983 3–2 60.0% — 1,473 0 0 1975 18–17 51.4% — 1,790 0 3
19 1984 0–1 0.0% #189 1,465 0 0 1976 11–19 36.7% — 1,707 0 3
20 1985 0–1 0.0% — 1,449 0 0 1977 8–15 34.8% — 1,677 0 3
21 1986 2–1 66.7% #151 1,479 0 0 1978 13–24 35.1% — 1,657 0 3
22 1987 6–8 42.9% #107 1,542 0 0 1979 18–19 48.6% — 1,694 0 5
23 1988 1–8 11.1% #208 1,495 0 0 1980 22–27 44.9% — 1,755 0 5
24 1989 5–7 41.7% #115 1,508 0 1 1981 20–21 48.8% — 1,808 0 6
25 1990 3–6 33.3% #165 1,496 0 1 1982 12–17 41.4% — 1,706 0 6
26 1991 2–2 50.0% #183 1,534 0 1 1983 18–22 45.0% — 1,693 0 6
27 1992 1–2 33.3% — 1,535 0 1 1984 11–18 37.9% #77 1,631 0 6
28 — — — — — — — 1985 14–12 53.8% — 1,714 0 6
29 — — — — — — — 1986 18–17 51.4% #46 1,699 0 6
30 — — — — — — — 1987 13–15 46.4% #61 1,646 0 6
31 — — — — — — — 1988 11–19 36.7% #109 1,586 0 6
32 — — — — — — — 1989 18–15 54.5% #45 1,662 0 6
33 — — — — — — — 1990 8–12 40.0% #96 1,640 0 6
34 — — — — — — — 1991 0–2 0.0% — 1,608 0 6
35 — — — — — — — 1992 1–5 16.7% #418 1,561 0 6
36 — — — — — — — 1993 0–4 0.0% — 1,511 0 6
37 — — — — — — — 1994 0–1 0.0% — 1,509 0 6

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 Kaoru Okamoto Betsy Nagelsen
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 1978 — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — —
15 1980 — — — — 0 1 1 0.0% — — — — — — — — 1972 — — — — 2 1 3 66.7% 0 1 1 0.0% — — — —
16 1981 0 2 2 0.0% — — — — — — — — 0 1 1 0.0% 1973 1 1 2 50.0% 0 2 2 0.0% — — — — — — — —
17 — — — — — — — — — — — — — — — — — 1974 3 2 5 60.0% 6 6 12 50.0% 13 6 19 68.4% 0 4 4 0.0%
18 1983 2 1 3 66.7% — — — — — — — — — — — — 1975 5 5 10 50.0% 6 5 11 54.5% 2 3 5 40.0% 0 1 1 0.0%
19 1984 0 1 1 0.0% — — — — — — — — — — — — 1976 0 2 2 0.0% 5 11 16 31.3% 3 3 6 50.0% 3 3 6 50.0%
20 — — — — — — — — — — — — — — — — — 1977 3 3 6 50.0% 1 4 5 20.0% 3 5 8 37.5% 1 3 4 25.0%
21 1986 2 1 3 66.7% — — — — — — — — — — — — 1978 3 7 10 30.0% 4 6 10 40.0% 5 5 10 50.0% 1 6 7 14.3%
22 1987 3 3 6 50.0% 0 1 1 0.0% 3 3 6 50.0% 0 1 1 0.0% 1979 4 7 11 36.4% 0 2 2 0.0% 4 4 8 50.0% 2 6 8 25.0%
23 1988 0 4 4 0.0% 0 1 1 0.0% 1 2 3 33.3% 0 1 1 0.0% 1980 7 7 14 50.0% 0 2 2 0.0% 10 7 17 58.8% 5 11 16 31.3%
24 1989 5 2 7 71.4% 0 1 1 0.0% 0 3 3 0.0% 0 1 1 0.0% 1981 5 6 11 45.5% 1 4 5 20.0% 11 4 15 73.3% 3 7 10 30.0%
25 1990 3 2 5 60.0% 0 1 1 0.0% 0 1 1 0.0% 0 2 2 0.0% 1982 2 4 6 33.3% 2 3 5 40.0% 3 3 6 50.0% 5 7 12 41.7%
26 1991 2 1 3 66.7% — — — — — — — — 0 1 1 0.0% 1983 2 7 9 22.2% 2 5 7 28.6% 4 5 9 44.4% 7 4 11 63.6%
27 1992 — — — — — — — — — — — — 1 2 3 33.3% 1984 9 7 16 56.3% 0 4 4 0.0% 2 7 9 22.2% — — — —
28 — — — — — — — — — — — — — — — — — 1985 6 5 11 54.5% 0 1 1 0.0% 7 5 12 58.3% 1 1 2 50.0%
29 — — — — — — — — — — — — — — — — — 1986 6 10 16 37.5% 0 1 1 0.0% 7 3 10 70.0% 5 3 8 62.5%
30 — — — — — — — — — — — — — — — — — 1987 8 6 14 57.1% — — — — 5 5 10 50.0% 0 4 4 0.0%
31 — — — — — — — — — — — — — — — — — 1988 5 13 18 27.8% — — — — 4 5 9 44.4% 2 1 3 66.7%
32 — — — — — — — — — — — — — — — — — 1989 12 10 22 54.5% — — — — 6 3 9 66.7% 0 2 2 0.0%
33 — — — — — — — — — — — — — — — — — 1990 3 7 10 30.0% 0 2 2 0.0% 5 3 8 62.5% — — — —
34 — — — — — — — — — — — — — — — — — 1991 — — — — — — — — 0 2 2 0.0% — — — —
35 — — — — — — — — — — — — — — — — — 1992 0 2 2 0.0% — — — — 1 1 2 50.0% 0 2 2 0.0%
36 — — — — — — — — — — — — — — — — — 1993 0 2 2 0.0% — — — — — — — — 0 2 2 0.0%
37 — — — — — — — — — — — — — — — — — 1994 0 1 1 0.0% — — — — — — — — — — — —
Career — 17 17 34 50.0% 0 6 6 0.0% 4 9 13 30.8% 1 9 10 10.0% — 84 114 198 42.4% 29 59 88 33.0% 95 80 175 54.3% 35 67 102 34.3%

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 Kaoru Okamoto Betsy Nagelsen
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 1978 1484 94.1 — — — — — — — 0.0% -4.50 — — — +0.20 — — — — — — — — — — — — — — — —
15 1980 1466 98.1 — — — — — — — 0.0% -4.00 — — — -0.25 1972 1511 98.7 — — — — — +28 — 53.8% +0.23 2–1 (67%) 1–1 — +0.77
16 1981 1441 93.7 — — — — +118 — — 14.3% -3.00 0–1 0–1 — +0.23 1973 1495 98.7 — — — — — — — 40.0% -1.00 0–2 1–0 — +0.54
17 — — — — — — — — — — — — — — — — 1974 1725 133.0 — — — — -176 -202 +77 57.7% +0.46 8–6 (57%) 5–6 (45%) 103.4 +0.49
18 1983 1473 101.5 — — — — +94 — — 53.3% 0.00 3–2 (60%) 1–1 — +0.61 1975 1791 125.1 — — — — -124 -166 -38 45.7% -0.44 4–4 (50%) 3–3 (50%) 101.5 -3.24
19 1984 1465 100.5 — — — — — — — 33.3% -0.67 0–1 — — -0.04 1976 1708 124.4 — — — — -64 -115 +73 41.4% -0.76 3–7 (30%) 1–1 — -1.59
20 1985 1449 92.5 — — — — — — — 0.0% -5.00 — — — +0.04 1977 1678 124.1 — — — — -30 -106 +48 37.9% -0.62 6–6 (50%) 1–2 (33%) — +0.11
21 1986 1480 106.1 — — — — +81 — — 57.1% +1.43 1–0 0–2 — +0.49 1978 1658 129.7 — — — — -102 -84 +101 41.2% -0.57 4–11 (27%) 3–7 (30%) 91.9 -1.33
22 1987 1543 119.8 — — — — +26 — +59 43.3% -0.07 1–1 0–3 (0%) — +0.50 1979 1695 123.1 — — — — -131 — +13 48.9% +0.08 8–8 (50%) 1–3 (25%) 98.5 +1.74
23 1988 1496 101.9 — — — — -11 — +75 20.0% -2.20 0–2 — — -0.14 1980 1756 131.7 — — — — -144 — +38 47.9% -0.41 7–12 (37%) 6–2 (75%) 102.2 -2.08
24 1989 1508 102.8 — — — — +49 — +7 42.3% -0.73 1–1 0–1 — +1.67 1981 1809 135.3 — — — — -128 -307 +95 49.5% -0.18 8–7 (53%) 5–5 (50%) 103.7 -3.62
25 1990 1496 100.2 — — — — +51 — — 31.6% -1.11 1–0 0–1 — +0.82 1982 1706 123.4 — — — — -98 -215 +169 47.3% -0.34 5–11 (31%) 9–3 (75%) 100.0 +0.16
26 1991 1534 117.4 — — — — +41 — — 50.0% +0.38 — 0–1 — -0.21 1983 1693 127.0 — — — — -32 -138 +114 46.3% -0.46 7–8 (47%) 7–6 (54%) 102.2 +0.86
27 1992 1536 100.8 — — — — +39 — — 28.6% -2.00 1–0 1–1 — +0.29 1984 1632 126.6 — — — — +58 -142 +116 41.4% -0.51 5–7 (42%) 7–3 (70%) 99.2 +0.78
28 — — — — — — — — — — — — — — — — 1985 1714 129.7 — — — — -25 — +88 54.2% +0.36 7–4 (64%) 1–2 (33%) — +1.14
29 — — — — — — — — — — — — — — — — 1986 1700 131.2 — — — — -55 — +170 51.8% +0.01 6–7 (46%) 4–3 (57%) 98.8 +1.52
30 — — — — — — — — — — — — — — — — 1987 1646 121.7 — — — — -24 — +150 46.2% 0.00 5–6 (45%) 4–5 (44%) 97.1 +1.59
31 — — — — — — — — — — — — — — — — 1988 1586 116.1 — — — — -26 — +128 42.5% -0.27 4–9 (31%) 5–8 (38%) 93.3 +1.50
32 — — — — — — — — — — — — — — — — 1989 1663 126.1 — — — — -56 — +97 50.6% +0.04 11–6 (65%) 3–4 (43%) 105.8 +1.46
33 — — — — — — — — — — — — — — — — 1990 1640 115.1 — — — — -81 — +173 40.0% -0.60 3–2 (60%) 2–4 (33%) 100.0 +0.09
34 — — — — — — — — — — — — — — — — 1991 1608 97.2 — — — — — — — 20.0% -2.40 0–1 — — -0.01
35 — — — — — — — — — — — — — — — — 1992 1561 105.4 — — — — -50 — — 26.7% -1.67 1–2 (33%) 1–0 — +0.03
36 — — — — — — — — — — — — — — — — 1993 1511 98.5 — — — — -47 — — 20.0% -2.70 0–2 0–1 — +0.17
37 — — — — — — — — — — — — — — — — 1994 1509 102.5 — — — — — — — 0.0% -5.50 — — — -0.16
51 2016 1516 — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 1590 108.0 — — — — +47 — +50 36.0% -0.97 8–8 (50%) 2–11 (15%) 94.2 +6.28 — 1893 132.2 — — — — -73 -148 +94 46.5% -0.28 104–129 (45%) 70–69 (50%) 101.0 +0.16

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.