Stadium: Cancha 5 Round: 26 Ground: Clay
| ITF M15 Villa Maria | 2021/03/31 13:00 | Tomas Farjat v Matheus P De Almeida | 5-7,3-6 |
| ITF M15 Antalya | 2021/03/21 07:30 | Miljan Zekic v Matheus P De Almeida | 6-1,3-6,6-4 |
| ITF M15 Antalya | 2021/03/20 07:30 | Peter Heller v Matheus P De Almeida | 4-6,6-7 |
| ITF M15 Antalya | 2021/03/19 07:30 | Seong Chan Hong v Matheus P De Almeida | 6-2,6-7,0-6 |
| ITF M15 Antalya | 2021/03/18 07:00 | Matheus P De Almeida v Alexander Cozbinov | 6-2,6-4 |
| ITF M15 Antalya | 2021/03/17 09:35 | Matheus P De Almeida v Alexander Weis | 6-1,6-1 |
| ITF M15 Antalya | 2021/03/14 09:00 | Matheus P De Almeida v Miljan Zekic | 6-4,6-4 |
| ITF M15 Antalya | 2021/03/13 10:35 | Dragos Dima v Matheus P De Almeida | 3-6,1-6 |
| ITF M15 Villa Maria | 2021/03/31 13:00 | Luciano Carraro v Gonzalo Villanueva | 5-7,6-0,4-6 |
| Challenger Santiago | 2021/03/17 14:00 | Sebastian Baez v Gonzalo Villanueva | 7-5,6-2 |
| Challenger Santiago | 2021/03/16 13:00 | Andrea Collarini v Gonzalo Villanueva | 4-6,4-6 |
| Challenger Santiago | 2021/03/15 13:00 | Carlos Gomez-Herrera v Gonzalo Villanueva | 4-6,3-6 |
| Challenger Santiago | 2021/03/14 14:00 | Daniel Antonio Nunez v Gonzalo Villanueva | 6-3,3-6,6-7 |
| ITF M25 Naples | 2021/02/27 16:00 | Gonzalo Villanueva v Corentin Denolly | 6-7,2-6 |
| ITF M25 Naples | 2021/02/26 16:00 | Martin Damm v Gonzalo Villanueva | 7-5,6-7,6-7 |
| ITF M25 Naples | 2021/02/25 14:50 | Michael Redlicki v Gonzalo Villanueva | 5-7,6-3,0-6 |