Stadium: Cancha 1 Round: 44 Ground: Clay
| ITF Argentina F8 | 2018/11/03 13:00 | Tomas Farjat v Matias Riva | 6-1,6-1 |
| ITF Peru F3 | 2018/10/07 16:00 | Tomas Farjat v Matias Riva | 6-7,6-0,6-2 |
| ITF Peru F2 | 2018/09/29 18:00 | Matias Riva v Laelson Rodrigues | 7-6,4-6,2-6 |
| ITF Bolivia F3 | 2018/09/25 14:00 | Matias Riva v Goran Markovic | 7-6,2-6,3-6 |
| ITF Bolivia F3 | 2018/09/24 15:30 | Matias Riva v Lucas C R Crichigno | 5-7,7-5,7-5 |
| 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 Chile F1 | 2018/11/11 16:30 | Felipe E Ordenes v Miguel Fernando Pereira | 6-7,7-6,6-2 |