Byron Bertram
all rivalries →| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Harold Solomon | 0 | 5 | 5 | Feb 15, 1980 | H2H |
| Ion Tiriac | 1 | 4 | 5 | Apr 6, 1978 | H2H |
| Stan Smith | 3 | 1 | 4 | Apr 5, 1980 | H2H |
| Roscoe Tanner | 1 | 3 | 4 | Apr 22, 1978 | H2H |
| Jimmy Connors | 0 | 4 | 4 | Jul 1, 1977 | H2H |
H2H data updated: 2026-09-01 00:00 UTC
Byron Bertram vs Nicholas Kalogeropoulos H2H: 1-2
Nicholas Kalogeropoulos holds a 2–1 lead over Byron Bertram in their ATP head-to-head. Across 3 main-draw meetings, they are tied 1–1 on carpet, while Nicholas Kalogeropoulos leads 1–0 on grass. Most recently, Byron Bertram won the 1974 Omaha round of 16 7-6 6-1.
Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.
H2H
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3 main draw meetings
H2H Match Log
| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Byron Bertram | 7-6 6-1 | Nicholas Kalogeropoulos | Match data | Jan 26, 1974* | R16 | Omaha | ATP 250 | Carpet |
| Nicholas Kalogeropoulos | 6-3 6-0 | Byron Bertram | Match data | Mar 24, 1973* | R16 | Washington 2 | ATP 250 | Carpet |
| Nicholas Kalogeropoulos | 6-4 6-1 | Byron Bertram | Match data | Jun 13, 1970* | QF | Beckenham | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Byron Bertram | #150 | #57 | 0 | 1,815 | 115 | 139 | 45.3% | 0 | 0 | 0 | 0 | 0 | 0 |
| Nicholas Kalogeropoulos | #511 | #108 | 0 | 1,687 | 55 | 75 | 42.3% | 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 | Byron Bertram | Nicholas Kalogeropoulos | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 16 | 1969 | 0–3 | 0.0% | — | 1,467 | 0 | 0 | — | — | — | — | — | — | — |
| 17 | 1970 | 11–11 | 50.0% | — | 1,540 | 0 | 0 | — | — | — | — | — | — | — |
| 18 | 1971 | 9–13 | 40.9% | — | 1,547 | 0 | 0 | — | — | — | — | — | — | — |
| 19 | 1972 | 2–2 | 50.0% | — | 1,536 | 0 | 0 | — | — | — | — | — | — | — |
| 20 | 1973 | 11–10 | 52.4% | #152 | 1,617 | 0 | 0 | — | — | — | — | — | — | — |
| 21 | 1974 | 15–13 | 53.6% | #156 | 1,655 | 0 | 0 | — | — | — | — | — | — | — |
| 22 | 1975 | 5–8 | 38.5% | #120 | 1,652 | 0 | 0 | — | — | — | — | — | — | — |
| 23 | 1976 | 23–24 | 48.9% | #57 | 1,737 | 0 | 0 | 1968 | 13–13 | 50.0% | — | 1,533 | 0 | 0 |
| 24 | 1977 | 21–27 | 43.8% | #87 | 1,744 | 0 | 0 | 1969 | 9–10 | 47.4% | — | 1,587 | 0 | 0 |
| 25 | 1978 | 10–11 | 47.6% | #92 | 1,668 | 0 | 0 | 1970 | 10–6 | 62.5% | — | 1,661 | 0 | 0 |
| 26 | 1979 | 1–2 | 33.3% | #219 | 1,649 | 0 | 0 | 1971 | 4–7 | 36.4% | — | 1,655 | 0 | 0 |
| 27 | 1980 | 7–15 | 31.8% | #150 | 1,570 | 0 | 0 | 1972 | 5–8 | 38.5% | — | 1,641 | 0 | 0 |
| 28 | — | — | — | — | — | — | — | 1973 | 12–18 | 40.0% | #113 | 1,567 | 0 | 0 |
| 29 | — | — | — | — | — | — | — | 1974 | 1–11 | 8.3% | #245 | 1,479 | 0 | 0 |
| 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 | Byron Bertram | Nicholas Kalogeropoulos | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Hard | Clay | Grass | Carpet | Yr | Hard | Clay | Grass | Carpet | |||||||||||||||||||||||||
| 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 % | |||
| 16 | 1969 | 0 | 3 | 3 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 17 | 1970 | 1 | 3 | 4 | 25.0% | 2 | 3 | 5 | 40.0% | 8 | 5 | 13 | 61.5% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 18 | 1971 | 4 | 5 | 9 | 44.4% | 0 | 2 | 2 | 0.0% | 5 | 4 | 9 | 55.6% | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 19 | 1972 | 1 | 1 | 2 | 50.0% | — | — | — | — | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 20 | 1973 | 3 | 3 | 6 | 50.0% | 1 | 3 | 4 | 25.0% | 6 | 3 | 9 | 66.7% | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 21 | 1974 | 3 | 1 | 4 | 75.0% | 1 | 4 | 5 | 20.0% | 1 | 1 | 2 | 50.0% | 10 | 7 | 17 | 58.8% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 22 | 1975 | 1 | 3 | 4 | 25.0% | 3 | 3 | 6 | 50.0% | 1 | 1 | 2 | 50.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 23 | 1976 | 7 | 4 | 11 | 63.6% | 13 | 15 | 28 | 46.4% | 0 | 1 | 1 | 0.0% | 3 | 4 | 7 | 42.9% | 1968 | — | — | — | — | 12 | 11 | 23 | 52.2% | 1 | 2 | 3 | 33.3% | — | — | — | — |
| 24 | 1977 | 7 | 10 | 17 | 41.2% | 4 | 7 | 11 | 36.4% | 6 | 3 | 9 | 66.7% | 4 | 7 | 11 | 36.4% | 1969 | 0 | 1 | 1 | 0.0% | 6 | 6 | 12 | 50.0% | 2 | 2 | 4 | 50.0% | 1 | 1 | 2 | 50.0% |
| 25 | 1978 | 0 | 3 | 3 | 0.0% | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | 10 | 6 | 16 | 62.5% | 1970 | 2 | 1 | 3 | 66.7% | 2 | 2 | 4 | 50.0% | 6 | 3 | 9 | 66.7% | — | — | — | — |
| 26 | 1979 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 50.0% | 1971 | 2 | 3 | 5 | 40.0% | 0 | 2 | 2 | 0.0% | 2 | 2 | 4 | 50.0% | — | — | — | — |
| 27 | 1980 | 4 | 6 | 10 | 40.0% | 0 | 3 | 3 | 0.0% | 1 | 4 | 5 | 20.0% | 2 | 2 | 4 | 50.0% | 1972 | — | — | — | — | 3 | 5 | 8 | 37.5% | 2 | 3 | 5 | 40.0% | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1973 | 5 | 7 | 12 | 41.7% | 3 | 6 | 9 | 33.3% | 0 | 2 | 2 | 0.0% | 4 | 3 | 7 | 57.1% |
| 29 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1974 | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | 1 | 9 | 10 | 10.0% |
| 34 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1979 | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 35 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1980 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 31 | 43 | 74 | 41.9% | 24 | 41 | 65 | 36.9% | 29 | 24 | 53 | 54.7% | 31 | 31 | 62 | 50.0% | — | 10 | 16 | 26 | 38.5% | 26 | 32 | 58 | 44.8% | 13 | 14 | 27 | 48.1% | 6 | 13 | 19 | 31.6% |
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 | Byron Bertram | Nicholas Kalogeropoulos | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | |
| 16 | 1969 | 1467 | 97.7 | — | — | — | — | +26 | — | — | 20.0% | -2.20 | — | — | — | -0.10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 17 | 1970 | 1541 | 119.6 | — | — | — | — | -55 | -40 | +104 | 49.1% | -0.21 | 0–1 | — | — | +0.86 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 18 | 1971 | 1547 | 108.9 | — | — | — | — | -39 | — | +97 | 47.5% | -0.13 | 2–7 (22%) | 3–2 (60%) | — | +2.12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 19 | 1972 | 1536 | 105.5 | — | — | — | — | — | — | — | 54.5% | +1.27 | — | 0–1 | — | +0.31 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 20 | 1973 | 1618 | 113.6 | — | — | — | — | +1 | -147 | +39 | 49.0% | -0.12 | 5–3 (63%) | 2–2 (50%) | — | +1.62 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 21 | 1974 | 1655 | 122.3 | — | — | — | — | +78 | -202 | — | 53.2% | +0.08 | 5–3 (63%) | 5–2 (71%) | — | +2.72 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 22 | 1975 | 1653 | 123.3 | — | — | — | — | +13 | -136 | — | 44.1% | -0.26 | 2–3 (40%) | 3–2 (60%) | — | -0.16 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 23 | 1976 | 1737 | 135.3 | — | — | — | — | +19 | -143 | — | 48.7% | -0.04 | 10–8 (56%) | 5–6 (45%) | — | -0.81 | 1968 | 1534 | 109.4 | — | — | — | — | — | +10 | — | 49.3% | -0.23 | 6–3 (67%) | — | — | +0.08 |
| 24 | 1977 | 1745 | 136.0 | — | — | — | — | -14 | -174 | +50 | 43.4% | -0.53 | 11–5 (69%) | 4–7 (36%) | — | -2.84 | 1969 | 1588 | 115.4 | — | — | — | — | -11 | -27 | -2 | 45.8% | -0.31 | 2–1 (67%) | — | — | +0.63 |
| 25 | 1978 | 1668 | 116.8 | — | — | — | — | +30 | — | — | 45.7% | -0.35 | 2–1 (67%) | 3–1 (75%) | — | +3.30 | 1970 | 1661 | 120.0 | — | — | — | — | -41 | -97 | +6 | 54.8% | +0.31 | 4–2 (67%) | — | — | +0.07 |
| 26 | 1979 | 1650 | 106.6 | — | — | — | — | +23 | — | — | 28.6% | -0.86 | 1–0 | 0–1 | — | +0.39 | 1971 | 1656 | 117.3 | — | — | — | — | -52 | — | +30 | 43.9% | -0.24 | 3–5 (38%) | 2–2 (50%) | — | -1.13 |
| 27 | 1980 | 1570 | 124.2 | — | — | — | — | +66 | -71 | +169 | 38.9% | -0.57 | 2–5 (29%) | 5–6 (45%) | — | -0.40 | 1972 | 1641 | 114.3 | — | — | — | — | — | -44 | +3 | 42.9% | -0.36 | 3–2 (60%) | 2–0 | — | -0.43 |
| 28 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1973 | 1568 | 120.8 | — | — | — | — | +76 | -4 | — | 46.6% | +0.05 | 5–9 (36%) | 3–5 (38%) | — | +2.25 |
| 29 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1974 | 1479 | 110.7 | — | — | — | — | +22 | — | — | 25.8% | -1.13 | 1–6 (14%) | 2–3 (40%) | — | +0.86 |
| 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 | — | 1816 | 130.3 | — | — | — | — | +20 | -141 | +86 | 46.2% | -0.25 | 40–36 (53%) | 30–30 (50%) | 106.0 | +2.79 | — | 1687 | 120.8 | — | — | — | — | +31 | -16 | +8 | 45.2% | -0.23 | 24–28 (46%) | 10–10 (50%) | 100.1 | +2.09 |
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.
Nicholas Kalogeropoulos
all rivalries →| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Ilie Nastase | 0 | 4 | 4 | Mar 25, 1973 | H2H |
| Clark Graebner | 1 | 3 | 4 | Feb 10, 1973 | H2H |
| Ian Fletcher | 2 | 1 | 3 | Feb 7, 1974 | H2H |
| Byron Bertram | 2 | 1 | 3 | Jan 26, 1974 | H2H |
| Ion Tiriac | 0 | 3 | 3 | Jan 28, 1973 | H2H |