H2H data updated: 2026-09-12 00:00 UTC
Sammy Giammalva Jr holds a 1–0 lead over Juan Avendano in their ATP head-to-head. Across 1 main-draw meeting, Sammy Giammalva Jr leads 1–0 on clay. Most recently, Sammy Giammalva Jr won the 1988 Forest Hills round of 64 6-3 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.
| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Sammy Giammalva Jr | 6-3 6-1 | Juan Avendano | Match data | May 4, 1988* | R64 | Forest Hills | 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.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Juan Avendano | #1,030 | #71 | 8 | 1,676 | 39 | 77 | 33.6% | 0 | 0 | 0 | 0 | 0 | 0 |
| Sammy Giammalva Jr | — | — | — | 1,803 | — | — | — | 0 | 0 | 0 | 0 | 2 | 0 |
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 | Juan Avendano | Sammy Giammalva Jr | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 19 | 1980 | 0–1 | 0.0% | #269 | 1,488 | 0 | 0 | — | — | — | — | — | — | — |
| 20 | 1981 | 0–2 | 0.0% | — | 1,479 | 0 | 0 | — | — | — | — | — | — | — |
| 21 | 1982 | 11–17 | 39.3% | #91 | 1,578 | 0 | 0 | — | — | — | — | — | — | — |
| 22 | 1983 | 12–14 | 46.2% | #93 | 1,644 | 0 | 0 | — | — | — | — | — | — | — |
| 23 | 1984 | 2–8 | 20.0% | #175 | 1,554 | 0 | 0 | — | — | — | — | — | — | — |
| 24 | 1985 | 2–8 | 20.0% | #144 | 1,523 | 0 | 0 | — | — | — | — | — | — | — |
| 25 | 1986 | 6–10 | 37.5% | #134 | 1,522 | 0 | 0 | — | — | — | — | — | — | — |
| 26 | 1987 | 4–10 | 28.6% | #209 | 1,475 | 0 | 0 | — | — | — | — | — | — | — |
| 27 | 1988 | 2–5 | 28.6% | #241 | 1,477 | 0 | 0 | — | — | — | — | — | — | — |
| 28 | 1989 | 0–1 | 0.0% | #715 | 1,462 | 0 | 0 | — | — | — | — | — | — | — |
| 29 | 1990 | 0–1 | 0.0% | #1007 | 1,455 | 0 | 0 | — | — | — | — | — | — | — |
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 | Juan Avendano | Sammy Giammalva Jr | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 % | |||
| 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1980 | 6 | 3 | 9 | 66.7% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1981 | 13 | 8 | 21 | 61.9% | 8 | 7 | 15 | 53.3% | — | — | — | — | 2 | 5 | 7 | 28.6% |
| 19 | 1980 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 1982 | 0 | 3 | 3 | 0.0% | 1 | 5 | 6 | 16.7% | 6 | 3 | 9 | 66.7% | 1 | 4 | 5 | 20.0% |
| 20 | 1981 | — | — | — | — | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | 1983 | 11 | 10 | 21 | 52.4% | 6 | 5 | 11 | 54.5% | 2 | 3 | 5 | 40.0% | 5 | 2 | 7 | 71.4% |
| 21 | 1982 | 1 | 1 | 2 | 50.0% | 10 | 15 | 25 | 40.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | 1984 | 8 | 7 | 15 | 53.3% | 3 | 4 | 7 | 42.9% | 3 | 2 | 5 | 60.0% | 1 | 2 | 3 | 33.3% |
| 22 | 1983 | — | — | — | — | 12 | 13 | 25 | 48.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | 1985 | 10 | 8 | 18 | 55.6% | — | — | — | — | 4 | 4 | 8 | 50.0% | 4 | 5 | 9 | 44.4% |
| 23 | 1984 | — | — | — | — | 2 | 8 | 10 | 20.0% | — | — | — | — | — | — | — | — | 1986 | 6 | 8 | 14 | 42.9% | 3 | 3 | 6 | 50.0% | 2 | 2 | 4 | 50.0% | 3 | 4 | 7 | 42.9% |
| 24 | 1985 | 0 | 1 | 1 | 0.0% | 2 | 7 | 9 | 22.2% | — | — | — | — | — | — | — | — | 1987 | 4 | 8 | 12 | 33.3% | 2 | 3 | 5 | 40.0% | 4 | 3 | 7 | 57.1% | 5 | 5 | 10 | 50.0% |
| 25 | 1986 | 0 | 3 | 3 | 0.0% | 6 | 7 | 13 | 46.2% | — | — | — | — | — | — | — | — | 1988 | 7 | 8 | 15 | 46.7% | 2 | 2 | 4 | 50.0% | 3 | 3 | 6 | 50.0% | 4 | 2 | 6 | 66.7% |
| 26 | 1987 | 1 | 1 | 2 | 50.0% | 3 | 8 | 11 | 27.3% | 0 | 1 | 1 | 0.0% | — | — | — | — | 1989 | 4 | 5 | 9 | 44.4% | 0 | 2 | 2 | 0.0% | 0 | 3 | 3 | 0.0% | 1 | 0 | 1 | 100.0% |
| 27 | 1988 | — | — | — | — | 2 | 5 | 7 | 28.6% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 28 | 1989 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 29 | 1990 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 2 | 6 | 8 | 25.0% | 37 | 68 | 105 | 35.2% | 0 | 3 | 3 | 0.0% | — | — | — | — | — | 69 | 68 | 137 | 50.4% | 25 | 32 | 57 | 43.9% | 24 | 23 | 47 | 51.1% | 26 | 29 | 55 | 47.3% |
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 | Juan Avendano | Sammy Giammalva Jr | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1980 | 1608 | 127.7 | — | — | — | — | +76 | — | — | 50.0% | -0.03 | 3–0 (100%) | 1–0 | — | +0.70 |
| 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1981 | 1672 | 132.0 | — | — | — | — | +26 | -93 | — | 50.0% | -0.02 | 15–10 (60%) | 8–8 (50%) | 103.8 | +2.44 |
| 19 | 1980 | 1489 | 96.1 | — | — | — | — | — | — | — | 0.0% | -4.50 | — | — | — | +0.06 | 1982 | 1623 | 123.4 | — | — | — | — | -34 | -90 | +29 | 41.3% | -0.35 | 4–8 (33%) | 3–7 (30%) | 94.9 | +1.50 |
| 20 | 1981 | 1479 | 108.1 | — | — | — | — | — | — | — | 0.0% | -4.00 | — | — | — | -0.26 | 1983 | 1701 | 132.6 | — | — | — | — | -1 | -112 | -28 | 53.3% | -0.09 | 7–7 (50%) | 8–4 (67%) | 103.1 | +2.18 |
| 21 | 1982 | 1578 | 133.2 | — | — | — | — | — | +20 | — | 45.2% | -0.26 | 1–3 (25%) | 2–6 (25%) | 96.4 | +0.32 | 1984 | 1715 | 139.4 | — | — | — | — | -12 | -117 | +2 | 47.1% | -0.23 | 6–2 (75%) | 3–3 (50%) | 105.8 | -0.79 |
| 22 | 1983 | 1644 | 140.1 | — | — | — | — | — | +45 | — | 48.3% | +0.12 | 4–5 (44%) | 3–5 (38%) | 98.4 | -0.89 | 1985 | 1737 | 142.0 | — | — | — | — | +7 | — | +16 | 50.6% | +0.04 | 3–2 (60%) | 8–3 (73%) | 106.1 | -0.64 |
| 23 | 1984 | 1554 | 110.0 | — | — | — | — | — | +30 | — | 34.6% | -0.92 | 0–4 (0%) | 1–2 (33%) | — | +0.50 | 1986 | 1740 | 140.4 | — | — | — | — | -9 | -120 | -6 | 48.8% | +0.15 | 4–6 (40%) | 3–1 (75%) | 100.4 | -1.68 |
| 24 | 1985 | 1524 | 123.6 | — | — | — | — | — | +34 | — | 32.0% | -1.36 | 1–4 (20%) | 1–2 (33%) | 97.5 | -0.70 | 1987 | 1644 | 128.6 | — | — | — | — | +2 | -40 | +94 | 43.4% | -0.45 | 4–4 (50%) | 5–6 (45%) | 97.9 | +0.11 |
| 25 | 1986 | 1522 | 118.1 | — | — | — | — | -28 | +75 | — | 41.7% | -0.56 | 1–3 (25%) | 2–1 (67%) | 99.1 | +0.69 | 1988 | 1653 | 124.7 | — | — | — | — | -2 | -43 | +53 | 51.8% | +0.13 | 7–6 (54%) | 5–6 (45%) | 97.8 | +0.72 |
| 26 | 1987 | 1475 | 113.0 | — | — | — | — | — | +53 | — | 35.3% | -0.71 | 1–3 (25%) | 0–3 (0%) | — | +0.59 | 1989 | 1582 | 113.0 | — | — | — | — | +68 | — | +50 | 35.9% | -0.54 | 2–2 (50%) | 0–3 (0%) | 96.8 | +0.53 |
| 27 | 1988 | 1477 | 106.9 | — | — | — | — | — | +39 | — | 38.9% | -1.22 | 1–3 (25%) | 1–1 | — | -0.12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 28 | 1989 | 1462 | 94.6 | — | — | — | — | — | — | — | 0.0% | -4.50 | — | — | — | +0.13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 29 | 1990 | 1456 | 104.7 | — | — | — | — | — | — | — | 33.3% | -1.00 | 0–1 | — | — | -0.07 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 1676 | 131.7 | — | — | — | — | -28 | +41 | — | 40.1% | -0.63 | 9–26 (26%) | 10–20 (33%) | 87.4 | +0.22 | — | 1804 | 139.1 | — | — | — | — | +8 | -94 | +29 | 48.1% | -0.11 | 55–47 (54%) | 44–41 (52%) | 103.6 | +1.72 |
Each player's five most-played main-draw opponents. The current matchup is highlighted when it appears in a player's top five.
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Roberto Arguello | 3 | 0 | 3 | Aug 6, 1986 | H2H |
| Thierry Tulasne | 0 | 3 | 3 | Jul 10, 1986 | H2H |
| Francesco Cancellotti | 1 | 2 | 3 | Jun 20, 1986 | H2H |
| Diego Perez | 1 | 2 | 3 | Jun 19, 1986 | H2H |
| Jose Lopez Maeso | 2 | 1 | 3 | Oct 5, 1983 | — |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Scott Davis | 3 | 3 | 6 | Jul 9, 1987 | — |
| Bill Scanlon | 2 | 3 | 5 | Feb 15, 1989 | — |
| Tim Mayotte | 2 | 3 | 5 | Sep 3, 1987 | — |
| Jimmy Connors | 0 | 5 | 5 | Nov 20, 1986 | — |
| Ivan Lendl | 0 | 5 | 5 | Mar 28, 1986 | — |