Stadium: Cancha 5 Round: 26 Ground: Clay
| Challenger Lima | 2021/09/27 20:15 | Francisco Cerundolo v Matheus P De Almeida | 2-6,4-6 |
| Challenger Kyiv | 2021/09/08 08:00 | Matheus P De Almeida v Nuno Borges | 6-2,2-6,5-7 |
| Challenger Kyiv | 2021/09/06 11:35 | Matheus P De Almeida v Michael Vrbensky | 6-3,6-2 |
| Challenger Como | 2021/08/30 09:00 | Matheus P De Almeida v Lucas Miedler | 7-6,4-6,2-6 |
| Challenger Como | 2021/08/29 10:00 | Geoffrey Blancaneaux v Matheus P De Almeida | 4-6,2-6 |
| Challenger Praha | 2021/08/23 13:40 | Filip Cristian Jianu v Matheus P De Almeida | 6-7,2-6 |
| Challenger Verona | 2021/08/18 13:00 | Holger Rune v Matheus P De Almeida | 6-2,6-3 |
| Challenger Verona | 2021/08/17 08:30 | Malek Jaziri v Matheus P De Almeida | 4-6,1-6 |
| Challenger Lima | 2021/09/28 15:00 | Johan Nikles v Adrian Menendez-Maceiras | 6-4,6-2 |
| Challenger Lima | 2021/09/27 15:00 | Johan Nikles v Oscar Jose Gutierrez | 6-4,6-2 |
| Challenger Lima | 2021/09/26 21:20 | Johan Nikles v Gianluca Ballotta | 6-0,6-3 |
| Challenger Ambato | 2021/09/24 17:40 | Johan Nikles v Juan Pablo Ficovich | 6-0,6-7,5-7 |
| Challenger Ambato | 2021/09/22 18:40 | Pedro Sakamoto v Johan Nikles | 3-6,4-6 |
| Challenger Ambato | 2021/09/21 17:40 | Pol Martin Tiffon v Johan Nikles | 5-7,6-7 |
| Challenger Quito | 2021/09/14 15:00 | Johan Nikles v Alexis Gautier | 0-6,4-6 |
| ITF M25 Oviedo | 2021/09/02 10:20 | Johan Nikles v Alvaro Lopez San Martin | 6-7,6-4,5-7 |