Guillermo Tunas
- Country
- Mexico
- Date of birth
- 2000-12-18
- Ranking ATP
- 1587 · 3 points
- Season 2026
- 1–4
Recent matches
| Date | Tournament | Round | Opponent | Score | Result |
|---|---|---|---|---|---|
| 2026-09-21 | De Wave Open Challenger 2026 | Q1 | Pierluigi Basile | 0-6 2-6 | lost |
| 2026-03-30 | Banorte Tennis Open | Q1 | Karl Poling | 3-6 0-6 | lost |
| 2026-03-23 | Morelia Open | Q2 | Alafia Ayeni | 1-6 4-6 | lost |
| 2026-03-23 | Morelia Open | Q1 | Joshua Sheehy | 2-1 | won |
| 2026-03-16 | Morelos Open | Q1 | Miguel Tobon | 1-6 1-6 | lost |
| 2025-04-14 | San Luis Potosi | Q1 | Felix Corwin | 2-6 4-6 | lost |
| 2025-04-07 | Mexico City | Q1 | Pedro Sakamoto | 1-6 2-6 | lost |
| 2025-03-24 | Morelia | Q1 | Viktor Durasovic | 1-6 1-6 | lost |
| 2025-03-17 | Merida | Q1 | Evan Zhu | 2-6 1-6 | lost |