H2H data updated: 2026-09-02 00:00 UTC

Jun Kamiwazumi vs Jeff Simpson H2H: 1-0

Jun Kamiwazumi holds a 1–0 lead over Jeff Simpson in their ATP head-to-head. Across 1 main-draw meeting, Jun Kamiwazumi leads 1–0 on hard courts. Most recently, Jun Kamiwazumi won the 1974 Tokyo round of 64 6-2 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.

Jun Kamiwazumi
JPN Age 78 Right-Handed
H2H
1 – 0
1 main draw meetings
Jeff Simpson
NZL Age 75 Right-Handed

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Jun Kamiwazumi 6-2 6-2 Jeff Simpson Match data Oct 15, 1974* R64 Tokyo ATP 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
Jun Kamiwazumi #808 #78 0 1,624 64 99 39.3% 0 0 0 0 0 0
Jeff Simpson #735 #66 0 1,587 47 94 33.3% 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 Jeff Simpson
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
17 — — — — — — — 1968 0–1 0.0% — 1,474 0 0
18 — — — — — — — 1969 0–3 0.0% — 1,418 0 0
19 — — — — — — — 1970 1–1 50.0% — 1,439 0 0
20 1968 1–1 50.0% — 1,498 0 0 1971 0–4 0.0% — 1,389 0 0
21 1969 0–1 0.0% — 1,483 0 0 1972 8–16 33.3% — 1,445 0 0
22 — — — — — — — 1973 18–21 46.2% #92 1,563 0 0
23 1971 6–5 54.5% — 1,535 0 0 1974 12–30 28.6% #132 1,464 0 0
24 1972 13–13 50.0% — 1,538 0 0 1975 3–2 60.0% #193 1,544 0 0
25 1973 10–16 38.5% #94 1,526 0 0 1976 1–2 33.3% — 1,533 0 0
26 1974 14–22 38.9% #100 1,579 0 0 — — — — — — —
27 1975 11–23 32.4% #127 1,570 0 0 — — — — — — —
28 1976 1–10 9.1% #206 1,515 0 0 — — — — — — —
29 1977 1–2 33.3% #264 1,523 0 0 1980 0–1 0.0% #365 1,516 0 0
30 1978 2–2 50.0% #284 1,549 0 0 1981 1–2 33.3% — 1,520 0 0
31 1979 3–1 75.0% #257 1,589 0 0 1982 1–8 11.1% #96 1,446 0 0
32 1980 2–2 50.0% #269 1,595 0 0 1983 2–3 40.0% #167 1,447 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 Jeff Simpson
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 %
17 — — — — — — — — — — — — — — — — — 1968 — — — — — — — — 0 1 1 0.0% — — — —
18 — — — — — — — — — — — — — — — — — 1969 0 1 1 0.0% 0 2 2 0.0% — — — — — — — —
19 — — — — — — — — — — — — — — — — — 1970 — — — — — — — — 1 1 2 50.0% — — — —
20 1968 — — — — — — — — 1 1 2 50.0% — — — — 1971 0 2 2 0.0% 0 1 1 0.0% 0 1 1 0.0% — — — —
21 1969 — — — — — — — — 0 1 1 0.0% — — — — 1972 1 3 4 25.0% 3 5 8 37.5% 3 6 9 33.3% 1 2 3 33.3%
22 — — — — — — — — — — — — — — — — — 1973 2 6 8 25.0% 4 7 11 36.4% 12 7 19 63.2% 0 1 1 0.0%
23 1971 4 3 7 57.1% 0 1 1 0.0% 2 1 3 66.7% — — — — 1974 1 8 9 11.1% 2 7 9 22.2% 3 5 8 37.5% 6 10 16 37.5%
24 1972 5 3 8 62.5% 6 5 11 54.5% 2 5 7 28.6% — — — — 1975 — — — — — — — — 3 1 4 75.0% 0 1 1 0.0%
25 1973 2 3 5 40.0% 2 6 8 25.0% 6 7 13 46.2% — — — — 1976 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% — — — — — — — — — — — — — — — — —
27 1975 0 5 5 0.0% 7 10 17 41.2% 1 2 3 33.3% 3 6 9 33.3% — — — — — — — — — — — — — — — — —
28 1976 0 2 2 0.0% 1 6 7 14.3% 0 2 2 0.0% — — — — — — — — — — — — — — — — — — — — —
29 1977 — — — — 1 1 2 50.0% 0 1 1 0.0% — — — — 1980 0 1 1 0.0% — — — — — — — — — — — —
30 1978 — — — — 2 1 3 66.7% — — — — 0 1 1 0.0% 1981 1 2 3 33.3% — — — — — — — — — — — —
31 1979 — — — — 3 1 4 75.0% — — — — — — — — 1982 0 2 2 0.0% 0 2 2 0.0% 1 4 5 20.0% — — — —
32 1980 — — — — 2 1 3 66.7% — — — — 0 1 1 0.0% 1983 2 1 3 66.7% 0 2 2 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% — 8 28 36 22.2% 9 26 35 25.7% 23 26 49 46.9% 7 14 21 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 Jeff Simpson
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
17 — — — — — — — — — — — — — — — — 1968 1474 98.4 — — — — — — — 40.0% -1.20 0–1 — — +0.07
18 — — — — — — — — — — — — — — — — 1969 1419 93.4 — — — — — — — 20.0% -2.10 0–1 — — +0.27
19 — — — — — — — — — — — — — — — — 1970 1440 105.6 — — — — — — — 62.5% +0.50 0–1 — — +0.09
20 1968 1498 97.2 — — — — — — — 50.0% -0.83 — — — +0.25 1971 1389 95.5 — — — — — — — 0.0% -2.43 — — — +0.56
21 1969 1483 95.1 — — — — — — — 0.0% -4.50 — — — +0.04 1972 1445 112.6 — — — — +10 +61 +55 33.3% -0.98 2–1 (67%) 0–2 — +0.79
22 — — — — — — — — — — — — — — — — 1973 1563 115.0 — — — — -105 -71 +76 46.8% -0.11 3–5 (38%) 1–2 (33%) — +2.88
23 1971 1535 104.7 — — — — +40 — +24 52.8% -0.42 1–2 (33%) 4–0 (100%) — +1.62 1974 1464 116.6 — — — — -45 -33 +135 33.3% -0.98 4–10 (29%) 4–10 (29%) — +1.84
24 1972 1538 106.9 — — — — +68 +51 -34 47.8% -0.15 6–3 (67%) 1–2 (33%) — +3.47 1975 1545 117.6 — — — — — — +136 64.3% +0.43 — 3–1 (75%) — +0.35
25 1973 1527 111.0 — — — — +83 -10 +16 39.7% -0.59 5–3 (63%) 5–6 (45%) — +1.56 1976 1534 96.6 — — — — -129 — — 42.9% -1.57 0–1 1–0 — +0.49
26 1974 1580 122.2 — — — — -11 +26 — 38.8% -0.85 5–6 (45%) 5–3 (63%) — +0.26 — — — — — — — — — — — — — — — —
27 1975 1570 124.1 — — — — -82 +30 -44 37.5% -0.76 2–5 (29%) 4–3 (57%) — -0.39 — — — — — — — — — — — — — — — —
28 1976 1515 119.6 — — — — — +32 — 14.8% -2.19 1–1 0–3 (0%) — -1.33 — — — — — — — — — — — — — — — —
29 1977 1523 106.2 — — — — — — — 42.9% -1.14 0–1 — — -0.19 1980 1516 98.9 — — — — — — — 0.0% -1.50 — 0–1 — +0.24
30 1978 1550 104.9 — — — — — +38 — 50.0% -0.40 1–1 1–1 — -0.01 1981 1520 108.6 — — — — -109 — — 42.9% +0.14 0–1 0–1 — +0.03
31 1979 1589 113.2 — — — — — +30 — 75.0% +1.75 — 0–1 — +0.47 1982 1446 93.8 — — — — — — +167 11.1% -2.11 1–0 1–3 (25%) — +0.56
32 1980 1596 103.5 — — — — — +22 — 40.0% -0.20 2–0 1–1 — +0.26 1983 1448 99.1 — — — — -27 — — 36.4% -0.82 1–0 0–2 — +0.86
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 — 1588 113.4 — — — — -56 -21 +98 37.2% -0.76 11–21 (34%) 10–22 (31%) 90.6 +6.45

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.