H2H data updated: 2026-09-01 00:00 UTC

Nicholas Kalogeropoulos vs Clark Graebner H2H: 1-3

Clark Graebner holds a 3–1 lead over Nicholas Kalogeropoulos in their ATP head-to-head. Across 4 main-draw meetings, Clark Graebner leads 2–0 on grass, while Nicholas Kalogeropoulos leads 1–0 on carpet. Most recently, Clark Graebner won the 1973 Des Moines final 7-5 4-6 6-4.

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Nicholas Kalogeropoulos
GRE Age 81 Right-Handed
H2H
1 – 3
4 main draw meetings
Clark Graebner
USA Age 82 Right-Handed 188 cm / 6'2"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Clark Graebner 7-5 4-6 6-4 Nicholas Kalogeropoulos Match data Feb 10, 1973* F Des Moines ATP 250 Hard
Clark Graebner 6-1 6-3 Nicholas Kalogeropoulos Match data Jun 13, 1970* SF Beckenham ATP 250 Grass
Clark Graebner (w/o) Nicholas Kalogeropoulos Match data Jun 17, 1969* R128 Queen's Club Championships ATP 250 Grass
Nicholas Kalogeropoulos 6-2 10-12 6-3 Clark Graebner Match data Feb 20, 1969* R32 Macon ATP 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
Nicholas Kalogeropoulos #511 #108 0 1,687 55 75 42.3% 0 0 0 0 0 0
Clark Graebner #199 #45 0 2,014 342 161 68.0% 0 0 0 0 12 12

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 Nicholas Kalogeropoulos Clark Graebner
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
23 1968 13–13 50.0% — 1,533 0 0 — — — — — — —
24 1969 9–10 47.4% — 1,587 0 0 1968 74–22 77.1% — 1,818 0 2
25 1970 10–6 62.5% — 1,661 0 0 1969 49–14 77.8% — 1,840 0 6
26 1971 4–7 36.4% — 1,655 0 0 1970 58–28 67.4% — 1,840 0 8
27 1972 5–8 38.5% — 1,641 0 0 1971 75–29 72.1% — 1,868 0 11
28 1973 12–18 40.0% #113 1,567 0 0 1972 33–22 60.0% — 1,811 0 11
29 1974 1–11 8.3% #245 1,479 0 0 1973 34–19 64.2% #48 1,770 0 12
30 — — — — — — — 1974 11–13 45.8% #99 1,693 0 12
31 — — — — — — — 1975 8–11 42.1% #120 1,583 0 12
32 — — — — — — — 1976 0–3 0.0% #199 1,540 0 12
34 1979 1–1 50.0% #511 1,488 0 0 — — — — — — —
35 1980 0–1 0.0% — 1,477 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 Nicholas Kalogeropoulos Clark Graebner
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 %
23 1968 — — — — 12 11 23 52.2% 1 2 3 33.3% — — — — — — — — — — — — — — — — — — — — —
24 1969 0 1 1 0.0% 6 6 12 50.0% 2 2 4 50.0% 1 1 2 50.0% 1968 30 11 41 73.2% 9 3 12 75.0% 28 6 34 82.4% 7 2 9 77.8%
25 1970 2 1 3 66.7% 2 2 4 50.0% 6 3 9 66.7% — — — — 1969 13 2 15 86.7% 10 4 14 71.4% 22 6 28 78.6% 4 2 6 66.7%
26 1971 2 3 5 40.0% 0 2 2 0.0% 2 2 4 50.0% — — — — 1970 15 11 26 57.7% 22 6 28 78.6% 12 3 15 80.0% 9 8 17 52.9%
27 1972 — — — — 3 5 8 37.5% 2 3 5 40.0% — — — — 1971 36 9 45 80.0% 19 7 26 73.1% 14 5 19 73.7% 6 8 14 42.9%
28 1973 5 7 12 41.7% 3 6 9 33.3% 0 2 2 0.0% 4 3 7 57.1% 1972 17 10 27 63.0% 2 2 4 50.0% 9 4 13 69.2% 5 6 11 45.5%
29 1974 0 2 2 0.0% — — — — — — — — 1 9 10 10.0% 1973 18 8 26 69.2% 5 4 9 55.6% 3 3 6 50.0% 8 4 12 66.7%
30 — — — — — — — — — — — — — — — — — 1974 2 4 6 33.3% 4 4 8 50.0% 2 2 4 50.0% 3 3 6 50.0%
31 — — — — — — — — — — — — — — — — — 1975 0 1 1 0.0% 3 4 7 42.9% — — — — 5 6 11 45.5%
32 — — — — — — — — — — — — — — — — — 1976 0 1 1 0.0% — — — — — — — — 0 2 2 0.0%
34 1979 1 1 2 50.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
35 1980 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 10 16 26 38.5% 26 32 58 44.8% 13 14 27 48.1% 6 13 19 31.6% — 131 57 188 69.7% 74 34 108 68.5% 90 29 119 75.6% 47 41 88 53.4%

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 Nicholas Kalogeropoulos Clark Graebner
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
23 1968 1534 109.4 — — — — — +10 — 49.3% -0.23 6–3 (67%) — — +0.08 — — — — — — — — — — — — — — — —
24 1969 1588 115.4 — — — — -11 -27 -2 45.8% -0.31 2–1 (67%) — — +0.63 1968 1819 133.7 — — — — +90 -116 +78 73.3% +1.64 10–8 (56%) — — +0.49
25 1970 1661 120.0 — — — — -41 -97 +6 54.8% +0.31 4–2 (67%) — — +0.07 1969 1841 131.4 — — — — +153 -98 +107 71.5% +1.35 8–5 (62%) 1–0 — +5.30
26 1971 1656 117.3 — — — — -52 — +30 43.9% -0.24 3–5 (38%) 2–2 (50%) — -1.13 1970 1841 135.3 — — — — -21 +68 +150 62.4% +0.83 17–8 (68%) 4–2 (67%) — +2.59
27 1972 1641 114.3 — — — — — -44 +3 42.9% -0.36 3–2 (60%) 2–0 — -0.43 1971 1868 141.1 — — — — +44 +29 +136 65.4% +1.01 21–7 (75%) 17–15 (53%) — +5.35
28 1973 1568 120.8 — — — — +76 -4 — 46.6% +0.05 5–9 (36%) 3–5 (38%) — +2.25 1972 1811 136.3 — — — — +27 +71 +133 58.0% +0.62 5–8 (38%) 6–4 (60%) — +3.04
29 1974 1479 110.7 — — — — +22 — — 25.8% -1.13 1–6 (14%) 2–3 (40%) — +0.86 1973 1770 134.1 — — — — +58 +80 +109 62.2% +0.84 6–5 (55%) 9–9 (50%) — +3.67
30 — — — — — — — — — — — — — — — — 1974 1693 114.0 — — — — +41 +100 +143 46.2% -0.38 6–5 (55%) 3–4 (43%) — +1.75
31 — — — — — — — — — — — — — — — — 1975 1584 111.5 — — — — +73 +121 — 52.4% -0.05 0–5 (0%) 6–3 (67%) — +3.44
32 — — — — — — — — — — — — — — — — 1976 1541 91.6 — — — — +44 — — 0.0% -3.83 — — — +0.51
34 1979 1489 103.6 — — — — — — — 50.0% -0.50 — 1–0 — +0.24 — — — — — — — — — — — — — — — —
35 1980 1478 100.1 — — — — — — — 0.0% -2.00 — — — +0.08 — — — — — — — — — — — — — — — —
Career — 1687 120.8 — — — — +31 -16 +8 45.2% -0.23 24–28 (46%) 10–10 (50%) 100.1 +2.09 — 2015 136.6 — — — — +51 +24 +113 64.3% +0.96 73–51 (59%) 46–37 (55%) 100.5 +5.29

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.