H2H data updated: 2026-09-03 00:00 UTC

Jun Kamiwazumi vs William Brown H2H: 0-1

William Brown holds a 1–0 lead over Jun Kamiwazumi in their ATP head-to-head. Across 1 main-draw meeting, William Brown leads 1–0 on clay. Most recently, William Brown won the 1973 Japan Open round of 64 7-5 2-6 7-6.

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Jun Kamiwazumi
JPN Age 78 Right-Handed
H2H
0 – 1
1 main draw meetings
William Brown
USA Age 81 Right-Handed

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
William Brown 7-5 2-6 7-6 Jun Kamiwazumi #79 Match data Oct 10, 1973* R64 Japan Open ATP 250 Clay

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
Jun Kamiwazumi #808 #78 0 1,624 64 99 39.3% 0 0 0 0 0 0
William Brown #436 #86 0 1,555 28 81 25.7% 0 0 0 0 0 0

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 Jun Kamiwazumi William Brown
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
20 1968 1–1 50.0% — 1,498 0 0 — — — — — — —
21 1969 0–1 0.0% — 1,483 0 0 — — — — — — —
23 1971 6–5 54.5% — 1,535 0 0 1968 2–6 25.0% — 1,442 0 0
24 1972 13–13 50.0% — 1,538 0 0 1969 2–5 28.6% — 1,448 0 0
25 1973 10–16 38.5% #94 1,526 0 0 1970 1–7 12.5% — 1,425 0 0
26 1974 14–22 38.9% #100 1,579 0 0 1971 1–6 14.3% — 1,415 0 0
27 1975 11–23 32.4% #127 1,570 0 0 1972 3–8 27.3% — 1,440 0 0
28 1976 1–10 9.1% #206 1,515 0 0 1973 2–12 14.3% #224 1,409 0 0
29 1977 1–2 33.3% #264 1,523 0 0 1974 11–19 36.7% #86 1,549 0 0
30 1978 2–2 50.0% #284 1,549 0 0 1975 5–16 23.8% #165 1,485 0 0
31 1979 3–1 75.0% #257 1,589 0 0 1976 1–1 50.0% #239 1,511 0 0
32 1980 2–2 50.0% #269 1,595 0 0 1977 0–1 0.0% #366 1,492 0 0
36 1984 0–1 0.0% #745 1,581 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 Jun Kamiwazumi William Brown
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 %
20 1968 — — — — — — — — 1 1 2 50.0% — — — — — — — — — — — — — — — — — — — — —
21 1969 — — — — — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
23 1971 4 3 7 57.1% 0 1 1 0.0% 2 1 3 66.7% — — — — 1968 — — — — 1 2 3 33.3% 1 4 5 20.0% — — — —
24 1972 5 3 8 62.5% 6 5 11 54.5% 2 5 7 28.6% — — — — 1969 2 2 4 50.0% 0 3 3 0.0% — — — — — — — —
25 1973 2 3 5 40.0% 2 6 8 25.0% 6 7 13 46.2% — — — — 1970 0 5 5 0.0% — — — — 1 2 3 33.3% — — — —
26 1974 2 4 6 33.3% 10 11 21 47.6% 0 2 2 0.0% 2 5 7 28.6% 1971 0 4 4 0.0% 1 1 2 50.0% — — — — 0 1 1 0.0%
27 1975 0 5 5 0.0% 7 10 17 41.2% 1 2 3 33.3% 3 6 9 33.3% 1972 0 2 2 0.0% 0 1 1 0.0% 2 3 5 40.0% 1 2 3 33.3%
28 1976 0 2 2 0.0% 1 6 7 14.3% 0 2 2 0.0% — — — — 1973 1 5 6 16.7% 1 1 2 50.0% 0 5 5 0.0% 0 1 1 0.0%
29 1977 — — — — 1 1 2 50.0% 0 1 1 0.0% — — — — 1974 1 3 4 25.0% 3 7 10 30.0% 3 4 7 42.9% 4 5 9 44.4%
30 1978 — — — — 2 1 3 66.7% — — — — 0 1 1 0.0% 1975 0 2 2 0.0% 2 6 8 25.0% 0 1 1 0.0% 3 7 10 30.0%
31 1979 — — — — 3 1 4 75.0% — — — — — — — — 1976 1 1 2 50.0% — — — — — — — — — — — —
32 1980 — — — — 2 1 3 66.7% — — — — 0 1 1 0.0% 1977 — — — — 0 1 1 0.0% — — — — — — — —
36 1984 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 13 21 34 38.2% 34 43 77 44.2% 12 22 34 35.3% 5 13 18 27.8% — 5 24 29 17.2% 8 22 30 26.7% 7 19 26 26.9% 8 16 24 33.3%

Advanced Statistics Comparison by Age

Seasons are aligned by the age each player spent most of that calendar year. Metrics are precomputed from eligible main-draw results; point-stat values use the available detailed sample. 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 Jun Kamiwazumi William Brown
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
20 1968 1498 97.2 — — — — — — — 50.0% -0.83 — — — +0.25 — — — — — — — — — — — — — — — —
21 1969 1483 95.1 — — — — — — — 0.0% -4.50 — — — +0.04 — — — — — — — — — — — — — — — —
23 1971 1535 104.7 — — — — +40 — +24 52.8% -0.42 1–2 (33%) 4–0 (100%) — +1.62 1968 1443 97.1 — — — — — +51 -1 31.6% -0.95 0–1 — — +0.02
24 1972 1538 106.9 — — — — +68 +51 -34 47.8% -0.15 6–3 (67%) 1–2 (33%) — +3.47 1969 1449 101.9 — — — — +135 +5 — 29.4% -1.29 1–1 — — -0.32
25 1973 1527 111.0 — — — — +83 -10 +16 39.7% -0.59 5–3 (63%) 5–6 (45%) — +1.56 1970 1426 102.9 — — — — +83 — +34 31.8% -1.32 0–3 (0%) — — +0.14
26 1974 1580 122.2 — — — — -11 +26 — 38.8% -0.85 5–6 (45%) 5–3 (63%) — +0.26 1971 1415 98.5 — — — — +22 — — 21.4% -1.64 1–1 0–1 — +0.06
27 1975 1570 124.1 — — — — -82 +30 -44 37.5% -0.76 2–5 (29%) 4–3 (57%) — -0.39 1972 1441 106.2 — — — — +6 — +72 37.0% -0.63 1–2 (33%) 1–3 (25%) — +0.30
28 1976 1515 119.6 — — — — — +32 — 14.8% -2.19 1–1 0–3 (0%) — -1.33 1973 1410 107.0 — — — — +31 — +18 24.2% -1.79 1–2 (33%) 3–3 (50%) — +0.02
29 1977 1523 106.2 — — — — — — — 42.9% -1.14 0–1 — — -0.19 1974 1550 114.9 — — — — -55 -68 -71 37.7% -1.26 1–3 (25%) 6–5 (55%) — +0.71
30 1978 1550 104.9 — — — — — +38 — 50.0% -0.40 1–1 1–1 — -0.01 1975 1486 110.8 — — — — -1 -31 — 28.8% -1.54 4–3 (57%) 4–4 (50%) — +1.07
31 1979 1589 113.2 — — — — — +30 — 75.0% +1.75 — 0–1 — +0.47 1976 1512 113.7 — — — — — — — 40.0% -0.20 1–0 1–0 — -0.37
32 1980 1596 103.5 — — — — — +22 — 40.0% -0.20 2–0 1–1 — +0.26 1977 1493 94.5 — — — — — — — 0.0% -3.00 — 0–1 — +0.28
36 1984 1581 98.5 — — — — — — — 0.0% -3.50 — — — +0.05 — — — — — — — — — — — — — — — —
Career — 1624 119.2 — — — — -1 +28 -3 40.7% -0.68 23–22 (51%) 21–20 (51%) 104.4 +3.76 — 1556 110.6 — — — — +11 -32 +2 31.5% -1.32 10–16 (38%) 15–17 (47%) 97.3 +1.80

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.