Stadium: Court 5 Round: 26 Ground: Hardcourt indoor
| ITF M15 Ithaca | 2021/11/03 14:00 | Mostardi, Nico v Credit Chaiyarin | 6-4,6-2 |
| ITF M15 Ithaca | 2021/11/02 14:30 | Mostardi, Nico v Leblanc, Alexandre | 7-6,4-6,7-10 |
| ITF M15 Ithaca | 2021/10/06 16:35 | Mostardi, Nico v Charles Broom | 1-6,6-7 |
| UTR Pro Tennis Series Dallas | 2021/08/08 15:30 | Evan Zhu v Mostardi, Nico | 6-4,5-0 |
| UTR Pro Tennis Series Dallas | 2021/08/07 13:00 | Demulling, Wyatt v Mostardi, Nico | 5-7,5-6 |
| UTR Pro Tennis Series Dallas | 2021/08/05 14:30 | Mostardi, Nico v Acevedo, Nicolas | 2-6,2-6 |
| UTR Pro Tennis Series Dallas | 2021/08/04 14:30 | Mostardi, Nico v Top Nidunjianzan | 7-6,3-6,6-1 |
| UTR Pro Tennis Series Dallas | 2021/08/03 14:30 | Mostardi, Nico v Latinovic, Stefan | 6-2,3-6,1-6 |
| ITF M15 Tallahassee | 2021/10/27 18:50 | Guy Orly Iradukunda v Bruno Kuzuhara | 4-6,7-6,2-6 |
| ITF - M15 Monastir | 2021/09/24 08:00 | Omar Brigida v Guy Orly Iradukunda | 6-7,7-6,6-4 |
| ITF - M15 Monastir | 2021/09/23 08:00 | Giorgio Ricca v Guy Orly Iradukunda | 5-7,7-5,6-7 |
| ITF - M15 Monastir | 2021/09/22 10:45 | Di Nocera, Riccardo v Guy Orly Iradukunda | 6-0,3-6,2-6 |
| ITF - M15 Monastir | 2021/09/16 10:55 | Guy Orly Iradukunda v Abhinav Sanjeev Shanmugam | 4-6,4-6 |
| ITF - M15 Monastir | 2021/09/15 14:00 | Guy Orly Iradukunda v Lorenzo Claverie | 6-1,7-5 |
| ITF - M15 Monastir | 2021/09/09 10:25 | Marat Sharipov v Guy Orly Iradukunda | 6-4,7-6 |
| ITF - M15 Monastir | 2021/09/08 14:00 | Guy Orly Iradukunda v Daniil Glinka | 6-4,6-4 |