Stadium: Quadra 4 Round: 62 Ground: Clay
| ITF Brazil F7 | 2018/10/27 12:00 | Osni Junior v Gabriel De Andrade Bendazoli | 7-5,6-0 |
| ITF Brazil F5 | 2018/10/18 17:25 | Osni Junior v Christian Lindell | 2-6,4-6 |
| ITF Germany F11 | 2018/08/06 11:00 | Osni Junior v Lucas Poullain | 6-4,4-6,6-7 |
| ITF Germany F11 | 2018/08/05 12:00 | Osni Junior v Marc Guardeno | 6-2,6-4 |
| ITF Germany F11 | 2018/08/05 10:00 | Adriano Quinti v Osni Junior | 3-6,0-6 |
| ITF Germany F10 | 2018/08/02 13:10 | Manuel Guinard v Osni Junior | 6-3,6-0 |
| ITF Germany F10 | 2018/08/01 11:45 | Osni Junior v Mike Loccisano | 6-4,5-7,6-4 |
| ITF Germany F10 Qual | 2018/07/30 12:00 | Nico Mertens v Osni Junior | 4-6,5-7 |
| ITF Brazil F7 | 2018/10/28 15:00 | Lucas Bernardo v Paulo A S Dos Santos | 4-6,6-7 |
| ITF Brazil F6 | 2018/10/23 17:00 | Francisco Comesana v Paulo A S Dos Santos | 6-0,6-1 |
| ITF Brazil F6 | 2018/10/21 15:30 | Paulo A S Dos Santos v Victor Bertoldo | 6-1,6-2 |
| ITF Brazil F5 | 2018/10/16 18:15 | Luis Britto v Paulo A S Dos Santos | 6-4,6-3 |
| ITF Bolivia F3 | 2018/09/24 14:30 | Lorenzo Gagliardo v Paulo A S Dos Santos | 7-5,3-6,6-4 |
| ITF Bolivia F2 | 2018/09/16 14:00 | Paulo A S Dos Santos v Julian Cundom | 2-6,3-6 |
| ITF Bolivia F1 | 2018/09/10 18:00 | Paulo A S Dos Santos v Joseph W. Van Meter | 1-6,6-4,5-7 |
| ITF Brazil F3 | 2018/05/11 00:00 | Christian Lindell v Paulo A S Dos Santos | 6-3,6-0 |