Round: 62 Ground: Clay
| ITF Bolivia F1 | 2018/09/09 16:30 | Marcos Castares v Alejandro H Franco | 7-5,6-3 |
| ITF Bolivia F1 | 2018/09/08 16:30 | Marcos Castares v Andres Urrea | 7-6,6-1 |
| ITF Argentina F4 | 2018/09/01 17:30 | Marcos Castares v Luciano Carraro | 2-6,5-7 |
| ITF Argentina F2 | 2018/05/19 14:30 | Marcos Castares v Agustin Riquelme Coppari | 3-6,2-6 |
| ITF Argentina F1 | 2018/05/12 14:00 | Julian Cundom v Marcos Castares | 6-1,7-5 |
| 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 |