H2H data updated: 2026-09-04 00:00 UTC

Jun Kamiwazumi vs Geoff Masters H2H: 1-0

Jun Kamiwazumi holds a 1–0 lead over Geoff Masters in their ATP head-to-head. Across 1 main-draw meeting, Jun Kamiwazumi leads 1–0 on grass. Most recently, Jun Kamiwazumi won the 1973 ASB Classic round of 32 7-6 6-3 3-6 4-6 6-3.

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Jun Kamiwazumi
JPN Age 78 Right-Handed
H2H
1 – 0
1 main draw meetings
Geoff Masters
AUS Age 75 Right-Handed

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Jun Kamiwazumi 7-6 6-3 3-6 4-6 6-3 Geoff Masters Match data Jan 11, 1973* R32 ASB Classic ATP 250 Grass

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
Geoff Masters #826 #42 0 1,889 237 253 48.4% 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.

Age Jun Kamiwazumi Geoff Masters
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
17 — — — — — — — 1968 2–2 50.0% — 1,511 0 0
18 — — — — — — — 1969 7–6 53.8% — 1,542 0 0
19 — — — — — — — 1970 10–7 58.8% — 1,581 0 0
20 1968 1–1 50.0% — 1,498 0 0 1971 19–22 46.3% — 1,573 0 0
21 1969 0–1 0.0% — 1,483 0 0 1972 18–18 50.0% — 1,670 0 0
22 — — — — — — — 1973 28–23 54.9% #52 1,756 0 0
23 1971 6–5 54.5% — 1,535 0 0 1974 23–21 52.3% #53 1,766 0 1
24 1972 13–13 50.0% — 1,538 0 0 1975 27–24 52.9% #44 1,812 0 1
25 1973 10–16 38.5% #94 1,526 0 0 1976 27–31 46.6% #53 1,780 0 2
26 1974 14–22 38.9% #100 1,579 0 0 1977 22–27 44.9% #83 1,662 0 2
27 1975 11–23 32.4% #127 1,570 0 0 1978 20–20 50.0% #59 1,701 0 2
28 1976 1–10 9.1% #206 1,515 0 0 1979 21–23 47.7% #62 1,728 0 2
29 1977 1–2 33.3% #264 1,523 0 0 1980 13–28 31.7% #166 1,517 0 2
30 1978 2–2 50.0% #284 1,549 0 0 1981 0–1 0.0% — 1,501 0 2
31 1979 3–1 75.0% #257 1,589 0 0 — — — — — — —
32 1980 2–2 50.0% #269 1,595 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 Geoff Masters
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 — — — — — — — — 2 2 4 50.0% — — — —
18 — — — — — — — — — — — — — — — — — 1969 — — — — 3 3 6 50.0% 4 3 7 57.1% — — — —
19 — — — — — — — — — — — — — — — — — 1970 — — — — 4 3 7 57.1% 6 4 10 60.0% — — — —
20 1968 — — — — — — — — 1 1 2 50.0% — — — — 1971 3 9 12 25.0% 5 6 11 45.5% 11 7 18 61.1% — — — —
21 1969 — — — — — — — — 0 1 1 0.0% — — — — 1972 11 5 16 68.8% 5 5 10 50.0% 2 7 9 22.2% 0 1 1 0.0%
22 — — — — — — — — — — — — — — — — — 1973 8 4 12 66.7% 15 13 28 53.6% 5 6 11 45.5% — — — —
23 1971 4 3 7 57.1% 0 1 1 0.0% 2 1 3 66.7% — — — — 1974 2 8 10 20.0% 11 5 16 68.8% 9 4 13 69.2% 1 4 5 20.0%
24 1972 5 3 8 62.5% 6 5 11 54.5% 2 5 7 28.6% — — — — 1975 9 9 18 50.0% 5 6 11 45.5% 6 3 9 66.7% 7 6 13 53.8%
25 1973 2 3 5 40.0% 2 6 8 25.0% 6 7 13 46.2% — — — — 1976 11 6 17 64.7% 6 9 15 40.0% 3 5 8 37.5% 7 11 18 38.9%
26 1974 2 4 6 33.3% 10 11 21 47.6% 0 2 2 0.0% 2 5 7 28.6% 1977 15 11 26 57.7% 0 2 2 0.0% 5 9 14 35.7% 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% 1978 7 5 12 58.3% 3 2 5 60.0% 4 4 8 50.0% 6 9 15 40.0%
28 1976 0 2 2 0.0% 1 6 7 14.3% 0 2 2 0.0% — — — — 1979 2 4 6 33.3% 4 3 7 57.1% 9 6 15 60.0% 6 10 16 37.5%
29 1977 — — — — 1 1 2 50.0% 0 1 1 0.0% — — — — 1980 2 6 8 25.0% 2 7 9 22.2% 1 6 7 14.3% 8 9 17 47.1%
30 1978 — — — — 2 1 3 66.7% — — — — 0 1 1 0.0% 1981 — — — — — — — — 0 1 1 0.0% — — — —
31 1979 — — — — 3 1 4 75.0% — — — — — — — — — — — — — — — — — — — — — — — — —
32 1980 — — — — 2 1 3 66.7% — — — — 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% — 70 67 137 51.1% 63 64 127 49.6% 67 67 134 50.0% 37 55 92 40.2%

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 Geoff Masters
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 1511 104.2 — — — — — — +30 54.5% +0.45 — — — +0.07
18 — — — — — — — — — — — — — — — — 1969 1542 108.7 — — — — — +20 -1 53.1% +0.47 2–1 (67%) — — +1.09
19 — — — — — — — — — — — — — — — — 1970 1581 113.8 — — — — — +4 +1 48.9% +0.09 2–0 0–1 — +2.04
20 1968 1498 97.2 — — — — — — — 50.0% -0.83 — — — +0.25 1971 1573 113.6 — — — — -110 +36 +80 44.4% -0.32 9–3 (75%) 1–3 (25%) 105.9 +2.45
21 1969 1483 95.1 — — — — — — — 0.0% -4.50 — — — +0.04 1972 1670 122.7 — — — — -2 -18 -123 48.0% +0.02 6–6 (50%) 3–4 (43%) 100.9 +1.43
22 — — — — — — — — — — — — — — — — 1973 1756 140.1 — — — — 0 -38 -146 52.2% +0.18 11–7 (61%) 8–9 (47%) 106.0 -1.32
23 1971 1535 104.7 — — — — +40 — +24 52.8% -0.42 1–2 (33%) 4–0 (100%) 102.6 +1.62 1974 1766 141.0 — — — — -125 +49 -11 52.2% +0.31 8–7 (53%) 3–6 (33%) 99.2 -2.52
24 1972 1538 106.9 — — — — +68 +51 -34 47.8% -0.15 6–3 (67%) 1–2 (33%) 103.3 +3.47 1975 1812 148.9 — — — — -23 -36 +8 53.0% +0.27 10–12 (45%) 6–8 (43%) 96.5 -3.09
25 1973 1527 111.0 — — — — +83 -10 +16 39.7% -0.59 5–3 (63%) 5–6 (45%) 103.9 +1.56 1976 1781 148.0 — — — — +86 -91 -12 48.5% +0.04 4–8 (33%) 9–4 (69%) 99.7 -2.30
26 1974 1580 122.2 — — — — -11 +26 — 38.8% -0.85 5–6 (45%) 5–3 (63%) 102.2 +0.26 1977 1662 120.4 — — — — +90 — -42 44.1% -0.40 8–10 (44%) 6–9 (40%) 95.2 +2.97
27 1975 1570 124.1 — — — — -82 +30 -44 37.5% -0.76 2–5 (29%) 4–3 (57%) 97.0 -0.39 1978 1701 140.0 — — — — +47 -24 -35 51.0% +0.09 5–8 (38%) 5–5 (50%) 95.9 +1.79
28 1976 1515 119.6 — — — — — +32 — 14.8% -2.19 1–1 0–3 (0%) — -1.33 1979 1729 143.8 — — — — -31 -3 -1 48.1% -0.11 8–8 (50%) 8–7 (53%) 102.7 -2.12
29 1977 1523 106.2 — — — — — — — 42.9% -1.14 0–1 — — -0.19 1980 1518 124.9 — — — — +79 +146 +101 36.6% -0.87 4–8 (33%) 8–8 (50%) 94.8 -0.05
30 1978 1550 104.9 — — — — — +38 — 50.0% -0.40 1–1 1–1 — -0.01 1981 1501 94.8 — — — — — — — 0.0% -4.00 — — — +0.19
31 1979 1589 113.2 — — — — — +30 — 75.0% +1.75 — 0–1 — +0.47 — — — — — — — — — — — — — — — —
32 1980 1596 103.5 — — — — — +22 — 40.0% -0.20 2–0 1–1 — +0.26 — — — — — — — — — — — — — — — —
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 — 1890 139.6 — — — — +20 -4 -11 48.2% -0.04 77–78 (50%) 57–64 (47%) 99.9 +0.13

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.