Stadium: Court 2 Round: 26 Ground: Hardcourt outdoor
| ITF Thailand F5 | 2018/10/01 04:00 | Saito, Takashi v Congsup Congcar | 7-6,1-6,6-4 |
| Challenger Kaohsiung | 2018/09/15 07:45 | Saito, Takashi v Yan Bai | 3-6,3-6 |
| ITF Thailand F3 | 2018/09/06 02:00 | Moritani, Soichiro v Saito, Takashi | 7-5,6-2 |
| ITF Thailand F3 | 2018/09/05 04:00 | Ito, Yuichi v Saito, Takashi | 2-6,6-4,3-6 |
| ITF Thailand F3 | 2018/09/04 06:55 | Kovapitukted, Palaphoom v Saito, Takashi | 6-4,4-6,2-6 |
| ITF Thailand F2 | 2018/08/29 04:00 | Saito, Takashi v Farren, Connor | 6-2,6-1 |
| ITF Thailand F2 | 2018/08/28 07:10 | Saito, Takashi v Wattanakul, Pol | 6-3,3-6,6-3 |
| Meerbusch, Allemagne, Qualifications | 2018/08/12 14:25 | Saito, Takashi v Alexandre Muller | 3-6,0-6 |
| ITF Thailand F5 | 2018/10/02 03:00 | Smola, Maciej v Navasirisomboon, Jirat | 3-6,5-7 |
| ITF Thailand F4 | 2018/09/25 05:45 | Sidharth Rawat v Navasirisomboon, Jirat | 4-6,6-2,6-3 |
| ITF Thailand F3 | 2018/09/05 02:00 | Navasirisomboon, Jirat v Singh, Karunuday | 3-6,4-6 |
| ITF Thailand F3 | 2018/09/03 03:00 | Kaewsuto, Chayanon v Navasirisomboon, Jirat | 1-6,4-6 |
| ITF Thailand F2 | 2018/08/29 02:45 | Navasirisomboon, Jirat v Schneider, Ronnie | 1-6,4-6 |
| ITF Thailand F2 | 2018/08/28 03:35 | Navasirisomboon, Jirat v Pumjit, Akanit | 6-2,7-6 |
| ITF Thailand F1 | 2018/08/23 05:05 | Navasirisomboon, Jirat v Rikl, Patrik | 1-6,2-6 |
| ITF Thailand F1 | 2018/08/22 04:40 | Navasirisomboon, Jirat v Kerdlaphee, Phongsapak | 7-5,6-2 |