Stadium: Court 8 Round: 44
| ITF Thailand F1 | 2018/08/18 04:20 | Nitiwat Jityaem v Worarin Kumthonkittikul | 1-6,1-6 |
| ITF Korea F4 | 2018/08/12 02:00 | Jeong Heon Lee v Worarin Kumthonkittikul | 6-2,6-3 |
| ITF Korea F4 | 2018/08/11 01:00 | Sang Yeop Kim v Worarin Kumthonkittikul | 0-6,3-6 |
| ITF Indonesia F3 Qual | 2018/08/04 07:00 | Worarin Kumthonkittikul v Siddharth Vishwakarma | 3-6,3-6 |
| ITF Guam F1 | 2018/06/17 00:00 | Yasunori Hashikawa v Worarin Kumthonkittikul | 1-6,5-7 |
| ITF Tunisia F21 | 2018/05/30 11:35 | Vasil Kirkov v Worarin Kumthonkittikul | 5-7,7-6,6-1 |
| ITF Tunisia F21 | 2018/05/27 09:00 | Philip Sikman v Worarin Kumthonkittikul | 2-6,2-6 |
| ITF Tunisia F21 | 2018/05/26 10:00 | Robert Hughes v Worarin Kumthonkittikul | 1-6,4-6 |
| ITF Chinese Taipei F2 Qual | 2018/07/22 05:30 | Alex Hunt v Gregory Nitayamekin | 6-2,6-2 |
| ITF Chinese Taipei F1 Qual | 2018/07/15 03:30 | Gregory Nitayamekin v Yi Jui Lo | 0-6,0-6 |
| ITF China F6 Qual | 2018/05/12 04:15 | Gregory Nitayamekin v Yong Jia Cai | 2-6,1-6 |
| ITF China F5 Qual | 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 |
| ITF Thailand F9 | 2015/06/14 06:50 | Nattan Benjasupawan v Gregory Nitayamekin | 6-1,6-0 |
| ITF Thailand F9 | 2015/05/02 03:00 | Gregory Nitayamekin v Phongsapak Kerdlaphee | 1-6,3-6 |
| ITF Thailand F10 | 2014/11/29 04:00 | Gregory Nitayamekin v Robert Willekes MacDonald | 0-6,0-6 |