H2H data updated: 2026-08-15 13:32 UTC
Nicolas Mejia holds a 1–0 lead over Adolfo Daniel Vallejo in their ATP head-to-head. Across 1 main-draw meeting, Nicolas Mejia leads 1–0 on grass. Most recently, Nicolas Mejia won the 2026 Wimbledon first round 4-6 6-4 7-5 7-6(2).
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| Winner | Score | Loser | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Nicolas Mejia | 4-6 6-4 7-5 7-6(2) | Adolfo Daniel Vallejo | Match data | Jun 29, 2026 | R128 | Wimbledon | Grand Slam | Grass |
| Player | Current | Peak | Pts | Elo | W | L | Win % | GS | 1000 | Finals | 500 | 250 | Titles |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adolfo Daniel Vallejo | #70 | #63 | 918 | 1,647 | 9 | 9 | 50.0% | 0 | 0 | 0 | 0 | 0 | 0 |
| Nicolas Mejia | #122 | #122 | 530 | 1,600 | 2 | 6 | 25.0% | 0 | 0 | 0 | 0 | 0 | 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 | Adolfo Daniel Vallejo | Nicolas Mejia | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 21 | — | — | — | — | — | — | — | 2021 | 0–1 | 0.0% | #286 | 1,513 | 0 | 0 |
| 22 | 2026 | 9–9 | 50.0% | #70 | 1,590 | 0 | 0 | — | — | — | — | — | — | — |
| 24 | — | — | — | — | — | — | — | 2024 | 0–1 | 0.0% | #219 | 1,467 | 0 | 0 |
| 25 | — | — | — | — | — | — | — | 2025 | 0–1 | 0.0% | #170 | 1,479 | 0 | 0 |
| 26 | — | — | — | — | — | — | — | 2026 | 2–3 | 40.0% | #122 | 1,585 | 0 | 0 |
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 | Adolfo Daniel Vallejo | Nicolas Mejia | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Elo | P+ | Serve+ | Return+ | PD | TPW% | Hard Elo | Clay Elo | Grass Elo | Set Win % | Set Margin | Dec. Set | Tiebreak | Schedule | Yr | Elo | P+ | Serve+ | Return+ | PD | TPW% | Hard Elo | Clay Elo | Grass Elo | Set Win % | Set Margin | Dec. Set | Tiebreak | Schedule | |
| 21 | 2025 | 1485 | 99.3 | — | — | — | — | — | — | — | — | — | — | — | — | 2021 | 1514 | 98.9 | -0.79 | -2.03 | 0.664 | 42.6% | — | — | — | 0.0% | -3.50 | — | — | +0.32 |
| 22 | 2026 | 1590 | 122.2 | -1.01 | +1.37 | 1.036 | 50.7% | — | +43 | — | 48.8% | +0.19 | 1–3 (25%) | 3–5 (38%) | +0.80 | 2022 | 1507 | 103.6 | — | — | — | — | — | — | — | — | — | — | — | — |
| 23 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2023 | 1496 | 102.5 | — | — | — | — | — | — | — | — | — | — | — | — |
| 24 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2024 | 1467 | 109.6 | +0.60 | -2.67 | 0.764 | 43.5% | — | — | — | 0.0% | -3.00 | — | 0–1 | -0.13 |
| 25 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2025 | 1479 | 103.8 | -2.90 | -3.45 | 0.543 | 41.0% | — | — | — | 0.0% | -3.50 | — | — | +0.10 |
| 26 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2026 | 1586 | 115.2 | -0.63 | -1.66 | 0.865 | 47.6% | -25 | — | — | 40.0% | -0.87 | 1–0 | 2–3 (40%) | +0.38 |
| Career | — | 1648 | 116.2 | -1.01 | +1.37 | 1.036 | 50.7% | — | +43 | — | 48.8% | +0.19 | 1–3 (25%) | 3–5 (38%) | +4.71 | — | 1600 | 113.0 | -0.78 | -2.06 | 0.780 | 45.6% | -25 | — | — | 28.6% | -1.57 | 1–0 | 2–4 (33%) | +8.38 |
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 |
|---|---|---|---|---|---|
| Kyrian Jacquet | 1 | 0 | 1 | Aug 14, 2026 | H2H |
| Juncheng Shang | 0 | 1 | 1 | Aug 2, 2026 | H2H |
| Kilian Feldbausch | 0 | 1 | 1 | Jul 21, 2026 | H2H |
| Luciano Darderi | 0 | 1 | 1 | Jul 18, 2026 | H2H |
| Stefano Travaglia | 1 | 0 | 1 | Jul 17, 2026 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Adam Walton | 0 | 1 | 1 | Aug 14, 2026 | H2H |
| Lorenzo Musetti | 0 | 1 | 1 | Aug 5, 2026 | H2H |
| Martin Landaluce | 1 | 0 | 1 | Aug 3, 2026 | H2H |
| Michael Zheng | 0 | 1 | 1 | Jul 1, 2026 | H2H |
| Adolfo Daniel Vallejo | 1 | 0 | 1 | Jun 29, 2026 | H2H |