Round: 62 Ground: Clay
| ITF Argentina F12 | 2017/12/05 12:00 | Augusto Laranja v Marcos Castares | 6-3,6-4 |
| ITF Argentina F12 | 2017/12/04 12:00 | Francisco Bastias v Marcos Castares | 4-6,4-6 |
| ITF Argentina F11 | 2017/11/25 21:00 | Marcos Castares v Lautaro Agustin Falabella | 6-1,1-6,3-6 |
| ITF Argentina F11 | 2017/11/25 14:30 | Francisco Aranguren v Marcos Castares | 3-6,6-7 |
| ITF Argentina F9 | 2017/11/11 14:00 | Marcos Castares v Mateo Galdon | 3-6,2-6 |
| ITF Argentina F8 | 2017/11/04 19:00 | Mateo Nicolas Martinez v Marcos Castares | 6-3,6-1 |
| ITF Bolivia F3 Qual | 2017/10/01 14:00 | Marcos Castares v Cleiner Caceres | 6-3,3-6,3-6 |
| ITF Bolivia F3 Qual | 2017/09/30 13:30 | Marcos Castares v Gabriel Alejandro Bernal | 6-0,6-3 |