| Thailand Open | 05/31 10:20 | 5 | Thammasin, S. v Jun Hao Leong | L | 1-2 | |
| Malaysia Masters | 05/24 02:55 | 5 | Thammasin, S. v Magnus Johannesen | L | 1-2 | |
| SEA Games | 05/08 05:30 | - | Vannthoun Vath v Thammasin, S. | W | 0-2 | |
| Orléans Masters | 04/05 10:50 | 5 | Jan Louda v Thammasin, S. | L | 2-0 | |
| Masters d'Espagne | 03/29 10:20 | 5 | Srikanth Kidambi v Thammasin, S. | L | 2-1 | |
| Open de Suisse | 03/22 13:40 | 5 | Thammasin, S. v Koki Watanabe | L | 0-2 | |
| Open d'Angleterre | 03/15 10:00 | 5 | Thammasin, S. v Lee, Zii Jia | L | 0-2 | |
| Masters de Thaïlande | 02/01 06:40 | 5 | Thammasin, S. v Anders Antonsen | L | 0-2 | |
| Indonesia Masters | 01/25 01:20 | 5 | Thammasin, S. v Guang Zu Lu | L | 1-2 | |
| Australian Open | 11/16 02:40 | 5 | Koki Watanabe v Thammasin, S. | L | 2-0 | |
| Hylo Open | 11/01 14:50 | 5 | Thammasin, S. v Liew, Daren | L | 0-2 | |
| Open de France | 10/27 11:40 | 4 | Viktor Axelsen v Thammasin, S. | L | 2-0 | |
| Open de France | 10/26 08:00 | 5 | Shi Yu Qi v Thammasin, S. | W | 0-2 | |
| Denmark Open | 10/18 07:00 | 5 | Kean Yew Loh v Thammasin, S. | L | 2-0 | |
| Japan Open | 08/30 03:00 | - | Guang Zu Lu v Thammasin, S. | L | 2-1 | |
| World Championships | 08/25 04:10 | 4 | Viktor Axelsen v Thammasin, S. | L | 2-0 | |
| World Championships | 08/23 01:00 | 5 | Thammasin, S. v Tze Yong Ng | W | 2-1 | |
| World Championships | 08/22 00:15 | 6 | Kanta Tsuneyama v Thammasin, S. | W | 1-2 | |
| Singapore Open | 07/13 03:55 | 5 | Thammasin, S. v H.S. Prannoy | L | 0-2 | |
| Open de Malaisie | 06/30 06:00 | - | Anthony Sinisuka Ginting v Thammasin, S. | L | 2-0 | |
| Open de Malaisie | 06/28 06:40 | 5 | Chico Aura Dwi Wardoyo v Thammasin, S. | W | 1-2 | |
| Indonesia Open | 06/14 05:20 | 5 | Zii Jia Lee v Thammasin, S. | L | 2-0 | |
| Indonesia Masters | 06/09 06:30 | - | Anthony Sinisuka Ginting v Thammasin, S. | L | 2-0 | |
| Indonesia Masters | 06/08 07:20 | - | Phetpradab, Khosit v Thammasin, S. | W | 1-2 | |
| Thomas Cup | 05/09 13:20 | - | Shesar Hiren Rhustavito v Thammasin, S. | L | 2-0 | |
| Thomas Cup | 05/08 13:20 | - | Yun Gyu Lee v Thammasin, S. | W | 0-2 | |
| Asia Championships | 04/27 11:00 | 5 | Thammasin, S. v Anthony Sinisuka Ginting | L | 1-2 | |
| Korea Masters | 04/16 02:20 | - | Thammasin, S. v Hyeok Jin Jeon | L | 0-2 | |
| Korea Masters | 04/15 04:00 | - | Thammasin, S. v Guang Zu Lu | W | 2-1 | |
| Korea Masters | 04/14 03:20 | - | Arnaud Merkle v Thammasin, S. | W | 1-2 |