H2H data updated: 2026-09-08 00:00 UTC

Marcos Ondruska vs George Kalovelonis H2H: 1-0

Marcos Ondruska holds a 1–0 lead over George Kalovelonis in their ATP head-to-head. Across 1 main-draw meeting, Marcos Ondruska leads 1–0 on clay. Most recently, Marcos Ondruska won the 1994 Athens round of 32 6-2 6-0.

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Marcos Ondruska
RSA Age 53 Right-Handed 183 cm / 6'0"
H2H
1 – 0
1 main-draw meetings
George Kalovelonis
GRE Age 67 Right-Handed 190 cm / 6'3"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Marcos Ondruska #122 6-2 6-0 George Kalovelonis #1230 Match data Oct 6, 1994* R32 Athens ATP World Series → modern equivalent 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
Marcos Ondruska #1,352 #27 1,007 1,786 106 138 43.4% 0 0 0 0 0 0
George Kalovelonis #1,301 #208 1 1,541 3 11 21.4% 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 Marcos Ondruska George Kalovelonis
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
17 1990 3–3 50.0% #256 1,537 0 0 — — — — — — —
18 1991 3–5 37.5% #137 1,589 0 0 — — — — — — —
19 1992 11–10 52.4% #67 1,640 0 0 — — — — — — —
20 1993 26–29 47.3% #47 1,568 0 0 — — — — — — —
21 1994 15–17 46.9% #98 1,686 0 0 — — — — — — —
22 1995 16–19 45.7% #114 1,665 0 0 — — — — — — —
23 1996 17–20 45.9% #102 1,675 0 0 1983 1–1 50.0% #576 1,522 0 0
24 1997 12–16 42.9% #113 1,656 0 0 1984 0–1 0.0% #283 1,519 0 0
25 1998 2–10 16.7% #142 1,541 0 0 — — — — — — —
26 1999 0–2 0.0% #159 1,520 0 0 1986 1–1 50.0% #285 1,528 0 0
27 2000 0–5 0.0% #204 1,477 0 0 1987 0–1 0.0% #542 1,519 0 0
28 2001 1–2 33.3% #263 1,569 0 0 1988 1–2 33.3% #473 1,504 0 0
29 — — — — — — — 1989 0–1 0.0% #1103 1,496 0 0
30 — — — — — — — 1990 0–1 0.0% #1007 1,481 0 0
31 — — — — — — — 1991 0–1 0.0% #1131 1,464 0 0
33 — — — — — — — 1993 0–1 0.0% #1178 1,459 0 0
34 — — — — — — — 1994 0–1 0.0% #1219 1,451 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 Marcos Ondruska George Kalovelonis
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 1990 3 3 6 50.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
18 1991 1 3 4 25.0% 2 1 3 66.7% — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — —
19 1992 7 7 14 50.0% 4 1 5 80.0% 0 2 2 0.0% — — — — — — — — — — — — — — — — — — — — —
20 1993 12 11 23 52.2% 10 11 21 47.6% 4 3 7 57.1% 0 4 4 0.0% — — — — — — — — — — — — — — — — —
21 1994 11 9 20 55.0% 3 5 8 37.5% 1 2 3 33.3% 0 1 1 0.0% — — — — — — — — — — — — — — — — —
22 1995 11 12 23 47.8% 1 3 4 25.0% 3 3 6 50.0% 1 1 2 50.0% — — — — — — — — — — — — — — — — —
23 1996 13 13 26 50.0% 0 3 3 0.0% 2 3 5 40.0% 2 1 3 66.7% 1983 — — — — 1 1 2 50.0% — — — — — — — —
24 1997 6 10 16 37.5% 4 3 7 57.1% 1 2 3 33.3% 1 1 2 50.0% 1984 — — — — 0 1 1 0.0% — — — — — — — —
25 1998 2 7 9 22.2% 0 1 1 0.0% — — — — 0 2 2 0.0% — — — — — — — — — — — — — — — — —
26 1999 0 1 1 0.0% 0 1 1 0.0% — — — — — — — — 1986 — — — — 1 1 2 50.0% — — — — — — — —
27 2000 0 4 4 0.0% — — — — 0 1 1 0.0% — — — — 1987 — — — — 0 1 1 0.0% — — — — — — — —
28 2001 0 1 1 0.0% 1 1 2 50.0% — — — — — — — — 1988 0 1 1 0.0% 1 1 2 50.0% — — — — — — — —
29 — — — — — — — — — — — — — — — — — 1989 — — — — 0 1 1 0.0% — — — — — — — —
30 — — — — — — — — — — — — — — — — — 1990 — — — — 0 1 1 0.0% — — — — — — — —
31 — — — — — — — — — — — — — — — — — 1991 — — — — 0 1 1 0.0% — — — — — — — —
33 — — — — — — — — — — — — — — — — — 1993 — — — — 0 1 1 0.0% — — — — — — — —
34 — — — — — — — — — — — — — — — — — 1994 — — — — 0 1 1 0.0% — — — — — — — —
Career — 66 81 147 44.9% 25 30 55 45.5% 11 16 27 40.7% 4 11 15 26.7% — 0 1 1 0.0% 3 10 13 23.1% — — — — — — — —

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 Marcos Ondruska George Kalovelonis
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 1990 1537 111.9 — — — — +45 — — 41.7% -1.25 1–1 1–0 — +0.20 — — — — — — — — — — — — — — — —
18 1991 1589 127.8 -3.07 +0.45 0.825 46.5% -15 +24 — 40.0% -0.60 1–1 0–1 — -0.46 — — — — — — — — — — — — — — — —
19 1992 1641 118.5 -2.04 +3.41 1.062 51.0% -37 +25 — 50.0% +0.14 4–2 (67%) 2–3 (40%) 102.8 +1.64 — — — — — — — — — — — — — — — —
20 1993 1568 136.6 -2.53 +2.02 0.972 49.6% +55 +92 +20 49.3% -0.07 7–11 (39%) 5–5 (50%) 96.4 +1.65 — — — — — — — — — — — — — — — —
21 1994 1687 133.1 -1.29 +1.94 0.994 50.0% -8 -54 -101 51.1% +0.02 6–10 (38%) 6–5 (55%) 97.5 -0.64 — — — — — — — — — — — — — — — —
22 1995 1666 131.0 -2.18 +1.47 0.970 49.6% +20 -47 -65 46.9% -0.02 8–7 (53%) 4–9 (31%) 98.1 -0.51 — — — — — — — — — — — — — — — —
23 1996 1675 135.7 -1.48 +1.63 0.982 49.3% +38 -128 -51 45.8% -0.15 5–5 (50%) 7–8 (47%) 97.4 -1.02 1983 1523 113.3 — — — — — — — 60.0% +0.80 0–1 — — -0.22
24 1997 1656 124.4 -3.01 -0.51 0.853 47.2% +1 -41 -28 38.0% -0.69 7–2 (78%) 4–7 (36%) 106.2 -0.01 1984 1520 106.2 — — — — — — — 0.0% -3.00 — — — -0.22
25 1998 1541 113.3 -3.51 -1.85 0.737 44.6% +23 — — 23.3% -1.53 1–2 (33%) 1–4 (20%) 96.2 +0.28 — — — — — — — — — — — — — — — —
26 1999 1520 102.7 -1.06 +2.09 0.716 43.6% — — — 0.0% -2.80 — — — -0.12 1986 1529 107.7 — — — — — — — 60.0% +1.60 0–1 0–2 — +0.09
27 2000 1477 113.2 -2.58 +2.02 0.709 43.5% +31 — — 16.7% -2.50 0–2 2–1 (67%) — -0.49 1987 1519 99.9 — — — — — — — 0.0% -4.00 — — — -0.03
28 2001 1569 114.2 -1.90 +4.79 0.909 48.2% — — — 33.3% -1.83 1–0 1–1 — -0.37 1988 1504 101.1 — — — — — — — 44.4% -0.78 — 2–0 — +0.50
29 — — — — — — — — — — — — — — — — 1989 1497 104.6 — — — — — — — 0.0% -3.50 — — — -0.09
30 — — — — — — — — — — — — — — — — 1990 1482 95.6 — — — — — — — 0.0% -4.00 — — — +0.17
31 — — — — — — — — — — — — — — — — 1991 1464 98.7 +1.65 -6.96 0.875 48.1% — — — 33.3% -0.67 0–1 — — +0.25
33 — — — — — — — — — — — — — — — — 1993 1459 103.2 -1.13 -3.34 0.467 37.0% — — — 0.0% -4.00 — — — -0.13
34 — — — — — — — — — — — — — — — — 1994 1451 94.8 +0.26 -2.86 0.547 36.3% — — — 0.0% -5.00 — — — -0.03
Career — 1786 135.2 -2.21 +1.52 0.947 49.0% +19 +16 -37 44.4% -0.33 41–43 (49%) 33–44 (43%) 97.0 +0.06 — 1542 108.8 +0.26 -4.39 0.616 40.5% — — — 32.4% -1.30 0–3 (0%) 2–2 (50%) 97.1 +2.07

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.