| Asia Championships | 2019/04/25 08:00 | Sitthikom Thammasin v Yuqi Shi | L | 0-2 |
| Asia Championships | 2019/04/24 10:40 | June Wei Cheam v Sitthikom Thammasin | W | 1-2 |
| Singapore Open | 2019/04/10 10:00 | Srikanth Kidambi v Sitthikom Thammasin | L | 2-0 |
| Singapore Open Qual | 2019/04/09 05:30 | Sitthikom Thammasin v Cheuk Yiu Lee | W | 2-1 |
| Singapore Open Qual | 2019/04/09 03:10 | Ihsan Maulana Mustofa v Sitthikom Thammasin | W | 0-2 |
| Malaysia Open | 2019/04/04 08:40 | Sitthikom Thammasin v Kanta Tsuneyama | L | 1-2 |
| Malaysia Open | 2019/04/03 05:00 | Sitthikom Thammasin v H.S. Prannoy | W | 2-1 |
| India Open | 2019/03/28 07:30 | Khosit Phetpradab v Sitthikom Thammasin | L | 2-1 |
| Orleans Masters | 2019/03/23 14:00 | Thomas Rouxel v Mark Caljouw | L | 2-0 |
| Orleans Masters | 2019/03/22 16:30 | Nhat Nguyen v Mark Caljouw | W | 0-2 |
| Orleans Masters | 2019/03/21 17:00 | Kai Schaefer v Mark Caljouw | W | 0-2 |
| Orleans Masters | 2019/03/20 20:00 | Giap Chin Goh v Mark Caljouw | W | 1-2 |
| Swiss Open | 2019/03/15 14:15 | Yuqi Shi v Mark Caljouw | L | 2-0 |
| Swiss Open | 2019/03/14 18:30 | Mark Caljouw v Parupalli Kashyap | W | 2-0 |
| Swiss Open | 2019/03/13 17:10 | Tommy Sugiarto v Mark Caljouw | W | 1-2 |
| German Open | 2019/02/27 20:25 | Mark Caljouw v Zii Jia Lee | L | 1-2 |