Stadium: C Round: 62 Ground: Hardcourt outdoor
| ITF Turkey F6 | 2018/02/10 09:00 | Daniel Appelgren v Natthasith Kunsuwan | 6-0,6-2 |
| Challenger Bangkok Qual | 2018/01/06 05:10 | Natthasith Kunsuwan v Kenneth Raisma | 0-6,3-6 |
| Challenger Bangkok Qual | 2017/12/30 04:30 | Natthasith Kunsuwan v Rudolf Molleker | 5-7,1-6 |
| ITF Thailand F12 Qual | 2017/12/09 03:00 | Richard Yang v Natthasith Kunsuwan | 6-3,6-3 |
| ITF Thailand F11 Qual | 2017/12/02 05:00 | Natthasith Kunsuwan v Ji Hoon Son | 3-6,4-6 |
| ITF Thailand F10 Qual | 2017/11/25 05:00 | Matthew Leffler v Natthasith Kunsuwan | 6-0,7-6 |
| ITF Indonesia F7 | 2017/11/22 03:30 | Natthasith Kunsuwan v Ti Chen | 1-6,1-6 |
| ITF Indonesia F7 | 2017/11/21 03:30 | Natthasith Kunsuwan v Arief Rahman | 6-3,6-3 |
| Davis Cup | 2018/04/07 02:00 | Jeson Patrombon v Jirat Navasirisomboon | 6-2,6-2 |
| Davis Cup | 2018/02/04 07:45 | Yasitha De Silva v Jirat Navasirisomboon | 5-7,2-6 |
| Davis Cup | 2018/02/03 04:00 | Sharmal Dissanayake v Jirat Navasirisomboon | 6-4,7-5 |
| ITF Thailand F12 Qual | 2017/12/09 06:30 | Jirat Navasirisomboon v Tihomir Grozdanov | 3-6,5-7 |
| ITF Thailand F11 Qual | 2017/12/03 03:00 | Florian Fallert v Jirat Navasirisomboon | 6-4,6-3 |
| ITF Thailand F11 Qual | 2017/12/02 06:00 | Richard Yang v Jirat Navasirisomboon | 6-4,6-7,2-6 |
| ITF Thailand F10 | 2017/11/28 06:00 | Alexey Vatutin v Jirat Navasirisomboon | 6-1,6-3 |
| ITF Thailand F10 Qual | 2017/11/26 09:00 | Maciej Jablonski v Jirat Navasirisomboon | 7-6,5-7,3-6 |