Stadium: Court 3 Round: 19 Ground: Clay
| Ambato, Ecuador | 2021/09/19 15:00 | Gonzalo Villanueva v Luca Castelnuovo | 6-7,6-7 |
| Challenger Quito | 2021/09/14 19:35 | Gonzalez, Alejandro v Luca Castelnuovo | 6-2,7-6 |
| Challenger Quito | 2021/09/13 16:20 | Luca Castelnuovo v Minda, Hugo | 6-4,6-3 |
| ITF M25 Sierre | 2021/09/03 10:00 | Rinky Hijikata v Luca Castelnuovo | 6-3,3-6,7-5 |
| ITF M25 Sierre | 2021/09/02 07:55 | Luca Castelnuovo v Moez Echargui | 7-6,7-6 |
| ITF M25 Sierre | 2021/08/31 16:30 | Luca Castelnuovo v Tanner, Gian Luca | 7-5,6-3 |
| ITF M25 Muttenz | 2021/08/19 10:35 | Luca Castelnuovo v Oscar Jose Gutierrez | 1-6,2-6 |
| ITF M25 Muttenz | 2021/08/18 12:50 | Gabriele Moghini v Luca Castelnuovo | 6-7,1-6 |
| Ambato, Ecuador | 2021/09/19 17:00 | Zukas, Matias v Matias Franco Descotte | 6-4,7-6 |
| Challenger Quito | 2021/09/13 16:05 | Zukas, Matias v Rodriguez, Cristian | 7-6,5-7,6-7 |
| UTR Pro Tennis Series Sofia | 2021/09/03 08:30 | Dzhavakian, Yurii v Zukas, Matias | 6-4,6-4 |
| UTR Pro Tennis Series Sofia | 2021/09/02 08:30 | Josh Sheehy v Zukas, Matias | 3-6,4-6 |
| UTR Pro Tennis Series Sofia | 2021/09/01 11:00 | Dimitrov, Martin v Zukas, Matias | 0-6,2-5 |
| UTR Pro Tennis Series Sofia | 2021/08/31 06:30 | Samuil Konov v Zukas, Matias | 3-6,1-6 |
| UTR Pro Tennis Series Sofia | 2021/08/30 11:15 | Zukas, Matias v Penev, Ivan | 7-5,6-3 |
| ITF M25 Poznan | 2021/08/28 09:30 | Roman Andres Burruchaga v Zukas, Matias | 6-1,6-4 |