Stadium: Center Court Round: 25 Ground: Hardcourt outdoor
| ITF Thailand F3 | 2018/09/03 03:00 | Pruchya Isarow v Nitin Kumar Sinha | 6-2,6-2 |
| ITF Thailand F2 | 2018/08/29 04:55 | Nitin Kumar Sinha v Dayne Kelly | 6-3,2-6,2-6 |
| ITF Thailand F2 | 2018/08/28 06:25 | Nitin Kumar Sinha v Kelsey Stevenson | 7-5,5-7,7-5 |
| ITF Thailand F1 | 2018/08/22 02:00 | Ronnie Schneider v Nitin Kumar Sinha | 6-0,6-2 |
| ITF Indonesia F3 | 2018/08/09 03:00 | Nitin Kumar Sinha v Daniel Nolan | 2-6,6-7 |
| ITF Indonesia F3 | 2018/08/08 02:30 | Nitin Kumar Sinha v Sho Shimabukuro | 3-6,7-6,7-5 |
| ITF Indonesia F3 | 2018/08/07 03:45 | Gabriel Petit v Nitin Kumar Sinha | 6-3,3-6,4-6 |
| ITF Indonesia F2 Qual | 2018/07/31 02:00 | Nitin Kumar Sinha v Michail Pervolarakis | 3-6,1-6 |
| ITF Germany F8 | 2018/07/19 11:35 | Orlando Luz v Guillermo Olaso | 7-6,6-0 |
| ITF Germany F8 | 2018/07/18 11:25 | Lucas Gerch v Guillermo Olaso | 2-6,3-6 |
| ITF Spain F16 | 2018/06/27 18:45 | Evan Hoyt v Guillermo Olaso | 4-6,6-2,6-4 |
| ITF Spain F16 | 2018/06/26 19:40 | Antonio Cembellin Prieto v Guillermo Olaso | 3-6,3-6 |
| ITF France F10 | 2018/06/19 11:15 | Guillermo Olaso v Eduard Guell Bartrina | 4-6,6-3,7-6 |
| Challenger Poznan Qual | 2018/06/04 13:30 | Jeremy Jahn v Guillermo Olaso | 6-7,6-1,6-2 |
| Challenger Poznan Qual | 2018/06/04 08:00 | Ronald Slobodchikov v Guillermo Olaso | 4-6,6-3,1-6 |
| Challenger Poznan Qual | 2018/06/03 09:25 | Juan Pablo Ficovich v Guillermo Olaso | 4-6,2-6 |