Stadium: Campo 1 Round: 14 Ground: Clay
| Challenger Verona | 2021/08/15 11:10 | Nicolas Alvarez v Matheus Pucinelli De Almeida | 2-6,1-6 |
| ITF M25 Guayaquil | 2021/08/03 14:30 | Juan A H Serrano v Nicolas Alvarez | 6-3,3-6,6-3 |
| ITF M25 Portoviejo | 2021/07/31 15:00 | Nicolas Alvarez v Arklon H D Pino | 1-6,4-6 |
| ITF M25 Portoviejo | 2021/07/30 14:30 | Nicolas Alvarez v Jose Pereira | 7-6,6-3 |
| ITF M25 Portoviejo | 2021/07/29 16:35 | Nicolas Alvarez v Noah Schachter | 6-2,6-2 |
| ITF M25 Tulsa | 2021/06/17 01:55 | Ezekiel Clark v Nicolas Alvarez | 6-4,6-2 |
| Challenger Orlando | 2021/06/07 14:00 | Nicolas Mejia v Nicolas Alvarez | 6-3,7-5 |
| Challenger Orlando | 2021/06/06 16:20 | Strong Kirchheimer v Nicolas Alvarez | 3-6,5-7 |
| Challenger Verona | 2021/08/17 10:20 | Pavel Kotov v Marco Bortolotti | 6-3,6-3 |
| ITF M25 Bolzano | 2021/08/05 08:00 | Federico Arnaboldi v Marco Bortolotti | 6-3,6-3 |
| ITF M25 Bolzano | 2021/08/04 11:10 | Marco Bortolotti v Arthur Reymond | 6-4,6-4 |
| ITF M25 Bolzano | 2021/08/03 16:20 | Marco Bortolotti v Luca Castagnola | 6-1,3-6,6-2 |
| ITF M25 Wroclaw | 2021/06/30 11:15 | Marco Bortolotti v Illya Beloborodko | 3-6,3-6 |
| Challenger Biella | 2021/05/30 10:55 | Alexey Vatutin v Marco Bortolotti | 3-6,6-4,6-1 |
| ITF M15 Prijedor | 2021/05/11 09:35 | Denis Yevseyev v Marco Bortolotti | 7-6,6-3 |
| Challenger Zadar | 2021/03/23 09:00 | Marco Bortolotti v Vit Kopriva | 1-6,3-6 |