| ITF Indonesia F7 | 11/21 03:30 | 25 | Natthasith Kunsuwan v Arief Rahman | 6-3,6-3 | |
| ITF Indonesia F7 Qual | 11/19 05:25 | 62 | Natthasith Kunsuwan v Ilsang Yoon | 6-2,7-5 | |
| ITF Indonesia F7 Qual | 11/18 03:30 | 62 | Hansel Sanjaya v Natthasith Kunsuwan | 0-6,0-6 | |
| ITF Vietnam F2 | 11/11 05:00 | 44 | Brian Tran v Natthasith Kunsuwan | 6-2,6-4 | |
| Challenger Ningbo Qual | 10/14 06:30 | 45 | Vishnu Vardhan v Natthasith Kunsuwan | 6-1,6-1 | |
| ITF Thailand F8 | 10/09 06:50 | 25 | Natthasith Kunsuwan v Suthinan Tanthaseraneewat | 3-6,5-7 | |
| ITF Thailand F7 Qual | 10/01 02:30 | 44 | Kazuma Kawachi v Natthasith Kunsuwan | 6-2,6-4 | |
| ITF Thailand F7 Qual | 09/30 02:30 | 44 | Natthasith Kunsuwan v Kasidit Samrej | 7-6,6-0 | |
| ITF Thailand F6 Qual | 08/12 04:15 | 44 | Punn Bodhidatta v Natthasith Kunsuwan | 6-2,7-6 | |
| ITF Thailand F4 Qual | 07/30 06:55 | 44 | Ronnie Schneider v Natthasith Kunsuwan | Walkover | |
| ITF Thailand F4 Qual | 07/29 03:00 | 44 | Natthasith Kunsuwan v Omer Yeshaya | 6-4,6-1 | |
| ITF Thailand F3 | 06/20 03:00 | 25 | David Nguyen v Natthasith Kunsuwan | 6-1,6-3 | |
| ITF Thailand F1 | 06/18 04:50 | 44 | Natthasith Kunsuwan v Vorachon Rakpuangchon | 5-7,6-1,6-3 | |
| ITF Thailand F1 | 06/17 09:00 | 44 | Nitin Kumar Sinha v Natthasith Kunsuwan | 4-6,5-7 | |
| ITF Thailand F2 | 06/13 03:00 | 25 | Calum Puttergill v Natthasith Kunsuwan | 6-3,6-3 | |
| ITF Thailand F2 | 06/11 03:00 | 44 | Natthasith Kunsuwan v Anthony Susanto | Retired | |
| ITF Thailand F2 | 06/10 03:00 | 44 | Natthasith Kunsuwan v Matthew Leffler | Retired | |
| ITF Thailand F1 | 06/06 05:05 | 25 | Thomas Fancutt v Natthasith Kunsuwan | 6-4,6-2 | |
| ITF Thailand F1 | 06/04 03:00 | 44 | Thanapet Chanta v Natthasith Kunsuwan | 4-6,1-6 | |
| ITF Thailand F1 | 06/03 07:00 | 44 | Werapath Sirijatiyaporn v Natthasith Kunsuwan | 1-6,4-6 | |
| Challenger Bangkok Qual | 12/31 04:45 | 45 | Natthasith Kunsuwan v Albano Olivetti | 1-6,4-6 | |
| ITF Thailand F5 | 12/17 06:00 | 44 | Yan Sabanin v Natthasith Kunsuwan | 6-4,6-4 | |
| ITF Thailand F5 | 12/17 03:30 | 44 | Natthasith Kunsuwan v Congsup Congcar | 7-5,7-6 | |
| ITF Thailand F4 | 12/10 09:00 | 44 | Natthasith Kunsuwan v Andrei Levine | 5-7,4-6 | |
| ITF Thailand F4 | 12/10 04:30 | 44 | Natthasith Kunsuwan v Nutdanai Sincharoenwattana | 6-2,6-2 | |
| ITF Thailand F3 | 09/05 03:00 | 25 | Issei Okamura v Natthasith Kunsuwan | 6-2,6-4 | |
| Challenger Bangkok 4 | 08/27 04:00 | 45 | Natthasith Kunsuwan v Toshihide Matsui | 0-6,4-6 | |
| ITF Thailand F4 | 08/21 03:00 | 54 | Ken Onishi v Natthasith Kunsuwan | 6-4,6-2 | |
| ITF Thailand F4 | 08/20 06:00 | 54 | Natthasith Kunsuwan v Pedro Scocuglia | 5-7,7-6,6-1 | |
| ITF Thailand F9 | 11/21 05:00 | 54 | Natthasith Kunsuwan v Vorachon Rakpuangchon | 1-6,4-6 |