Round: 62 Ground: Clay
| ITF Bolivia F3 | 2018/09/23 14:00 | Manuel Barros v Matias Riva | 3-6,4-6 |
| ITF Bolivia F2 | 2018/09/15 16:00 | Matias Riva v Alex Blumenberg | 4-6,4-6 |
| ITF Argentina F4 | 2018/09/01 12:00 | Benjamin L Ambrosio v Matias Riva | 6-1,6-1 |
| ITF Argentina F3 | 2018/05/26 12:00 | Lautaro Agustin Falabella v Matias Riva | 6-1,6-3 |
| ITF Argentina F2 | 2018/05/19 12:00 | Matias Riva v Oscar Gabriel Ortiz | 1-6,3-6 |
| ITF Argentina F1 | 2018/05/13 14:30 | Alan Postay v Matias Riva | 6-3,6-0 |
| ITF Argentina F12 | 2017/12/03 12:00 | Leonardo Aboian v Matias Riva | 6-4,6-4 |
| ITF Argentina F11 | 2017/11/26 13:00 | Gaston Tonello v Matias Riva | 6-2,6-1 |
| ITF Bolivia F3 | 2018/09/23 14:00 | Lucas C R Crichigno v Pedro Ortega | 7-5,6-1 |
| ITF Argentina F6 | 2018/09/16 15:15 | Esteban Bruna v Lucas C R Crichigno | 6-2,6-4 |
| ITF Bolivia F1 | 2018/09/12 02:05 | Matias Franco Descotte v Lucas C R Crichigno | 6-2,6-0 |
| ITF Bolivia F1 | 2018/09/10 20:30 | Lucas C R Crichigno v Marcos Castares | 6-3,6-2 |