Round: 62 Ground: Hardcourt outdoor
| ITF - Thailand F3 | 2018/09/01 02:00 | Chanon Phunsawat v Nawakarn Khunjan | 3-6,2-6 |
| ITF - Thailand F1 | 2018/08/22 04:50 | Nawakarn Khunjan v Patrik Rikl | 2-6,2-6 |
| ITF - Thailand F1 | 2018/08/21 06:35 | Nawakarn Khunjan v Akanit Pumjit | 6-7,6-2,6-2 |
| ITF - Thailand F1 | 2018/08/20 03:50 | Nawakarn Khunjan v Coleman Wong | 6-3,6-0 |
| ITF - Thailand F1 | 2018/08/19 03:40 | Emmanuel Luria v Nawakarn Khunjan | 3-6,0-6 |
| ITF - Thailand F1 | 2018/08/18 03:30 | Nawakarn Khunjan v Krittin Koaykul | 7-5,7-6 |
| ITF - Malaysia F3 | 2018/07/15 02:00 | Nawakarn Khunjan v Bernardo A P E Oliveira | 4-6,3-6 |
| ITF - Malaysia F2 | 2018/07/08 03:00 | Quentin Robert v Nawakarn Khunjan | 6-0,6-2 |
| ITF - Thailand F4 | 2018/09/22 02:30 | Delf Gohlke v Gregory Nitayamekin | 6-0,6-3 |
| ITF - Thailand F3 | 2018/09/02 02:00 | Prachaya Baibong v Gregory Nitayamekin | 6-0,6-0 |
| ITF - Thailand F1 | 2018/08/19 05:00 | Worarin Kumthonkittikul v Gregory Nitayamekin | 6-1,6-0 |
| ITF - Taiwan F2 - Qualifikation | 2018/07/22 05:30 | Alex Hunt v Gregory Nitayamekin | 6-2,6-2 |
| ITF - Taiwan F1 - Qualifikation | 2018/07/15 03:30 | Gregory Nitayamekin v Yi Jui Lo | 0-6,0-6 |
| ITF - China F6 - Qualifikation | 2018/05/12 04:15 | Gregory Nitayamekin v Yong Jia Cai | 2-6,1-6 |
| ITF - China F5 - Qualifikation | 2018/05/05 02:00 | Mitchell Thomas McDaniels v Gregory Nitayamekin | 6-2,6-1 |
| ITF - Thailand F9 | 2015/08/01 05:00 | Kunal Anand v Gregory Nitayamekin | 6-2,6-1 |