| ITF M15 Kiryat Shmona | 08/26 13:00 | 45 | Roi Ginat v Natthasith Kunsuwan | 6-2,6-1 | |
| ITF M15 Kiryat Shmona | 08/26 08:30 | 45 | Rotem Sobol v Natthasith Kunsuwan | 6-7,3-6 | |
| ITF M15 Hua Hin | 08/19 06:25 | 54 | Natthasith Kunsuwan v Sung Jun Park | 0-6,4-6 | |
| ITF M25 Nonthaburi | 07/30 04:50 | 54 | Noppadol Noikor v Natthasith Kunsuwan | 6-4,6-4 | |
| ITF M25 Nonthaburi | 07/29 04:00 | 54 | Natthasith Kunsuwan v Congsup Congcar | 6-4,7-6 | |
| ITF M25 Nonthaburi | 07/22 02:30 | 54 | Dusty H. Boyer v Natthasith Kunsuwan | 6-4,6-3 | |
| ITF M25 Nonthaburi | 05/29 04:35 | 25 | Natthasith Kunsuwan v Kasidit Samrej | 6-4,3-6,5-7 | |
| ITF M25 Nonthaburi | 05/28 04:40 | 54 | Natthasith Kunsuwan v Michael Mat'chand | 6-4,6-3 | |
| ITF M25 Nonthaburi | 05/22 03:00 | 25 | Natthasith Kunsuwan v Jayden Court | 7-5,3-6,6-7 | |
| ITF M25 Luan | 05/15 07:40 | 25 | Rimpei Kawakami v Natthasith Kunsuwan | 6-4,6-1 | |
| ITF M25 Luan | 05/14 03:25 | 54 | Natthasith Kunsuwan v Guan Kai Wang | 6-0,6-0 | |
| ITF M25 Luan | 05/13 03:10 | 54 | Natthasith Kunsuwan v Zijiang Yang | 6-2,6-2 | |
| ITF M25 Wuhan | 05/06 07:05 | 54 | Karunuday Singh v Natthasith Kunsuwan | 6-4,6-2 | |
| ITF M15 Wuhan | 04/30 03:20 | 54 | Natthasith Kunsuwan v Pak Long Yeung | 5-7,2-6 | |
| ITF M15 Wuhan | 04/29 07:05 | 54 | Natthasith Kunsuwan v Yaojie Zeng | 7-6,6-3 | |
| ITF M15 Nishi-Tama | 03/05 01:00 | 45 | Aoran Wang v Natthasith Kunsuwan | 6-4,6-4 | |
| Challenger Bangkok | 02/11 06:25 | 24 | Natthasith Kunsuwan v David Perez Sanz | 2-6,4-6 | |
| ITF M25 Hong Kong | 01/01 03:35 | 45 | Kuan-Yi Lee v Natthasith Kunsuwan | 6-2,6-3 | |
| ITF Hong Kong F3 | 12/24 02:00 | 54 | Congsup Congcar v Natthasith Kunsuwan | 6-3,7-6 | |
| ITF Thailand F9 | 11/12 04:30 | 25 | Natthasith Kunsuwan v Robert Strombachs | 2-6,0-6 | |
| ITF Thailand F8 | 11/03 06:00 | 44 | Yeongseok Jeong v Natthasith Kunsuwan | 6-2,4-6,6-4 | |
| Challenger Shenzhen 2 | 10/27 07:30 | 45 | Saketh Myneni v Natthasith Kunsuwan | 6-4,7-5 | |
| ITF Thailand F6 | 10/08 02:30 | 62 | Natthasith Kunsuwan v Daisuke Sumizawa | 2-6,2-6 | |
| ITF Thailand F6 | 10/06 05:30 | 62 | Natthasith Kunsuwan v Daniel Kossek | 6-4,6-7,6-4 | |
| ITF Thailand F5 | 09/30 02:30 | 62 | Seung-Hun Shin v Natthasith Kunsuwan | 7-6,6-1 | |
| ITF Thailand F5 | 09/29 02:30 | 62 | Bingyu Yu v Natthasith Kunsuwan | 6-3,3-6,3-6 | |
| ITF Thailand F4 | 09/24 02:30 | 62 | Natthasith Kunsuwan v Tsung-Hao Huang | 6-7,5-7 | |
| ITF Thailand F3 | 09/04 07:45 | 25 | Soichiro Moritani v Natthasith Kunsuwan | 6-2,6-2 | |
| ITF Thailand F3 | 09/02 02:00 | 44 | Natthasith Kunsuwan v Nawakarn Khunjan | Retired | |
| ITF Thailand F2 | 08/28 02:00 | 25 | Natthasith Kunsuwan v Dayne Kelly | 3-6,1-6 |