| Open d'Australie - Qualif. | 2019/06/04 00:10 | Sun, F. v Koki Watanabe | L | 2-1 |
| New Zealand Open Qual | 2019/04/29 22:35 | Koki Watanabe v Sun, F. | L | 0-2 |
| Vietnam Open | 2019/09/12 02:00 | Heo, Kwang Hee v Koki Watanabe | W | 1-2 |
| Vietnam Open | 2019/09/11 02:30 | Koki Watanabe v Ivancic, Miha | W | 2-0 |
| Chinese Taipei Open 2019, MS | 2019/09/07 05:00 | Heo, Kwang Hee v Koki Watanabe | L | 2-1 |
| Chinese Taipei Open 2019, MS | 2019/09/06 09:00 | Lu, C. H. v Koki Watanabe | W | 0-2 |
| Chinese Taipei Open 2019, MS | 2019/09/05 09:15 | Koki Watanabe v Kean Yew Loh | W | 2-1 |
| Chinese Taipei Open 2019, MS | 2019/09/04 12:30 | Yang, Chih Chieh v Koki Watanabe | W | 0-2 |
| Akita Masters 2019, MS | 2019/08/16 02:15 | Igarashi, Yu v Koki Watanabe | L | 2-1 |
| Akita Masters 2019, MS | 2019/08/15 05:25 | Koki Watanabe v Thongnuam, Pannawit | W | 2-0 |
| Vietnam Open | 2019/09/12 02:00 | Sun, F. v Weng, H. Y. | W | 2-1 |
| Akita Masters 2019, MS | 2019/08/14 04:50 | Sun, F. v Kholik, Firman Abdul | L | 1-2 |
| Hyderabad Open 2019, MS | 2019/08/08 09:20 | Sun, F. v Verma, Sourabh | L | 0-2 |
| Hyderabad Open 2019, MS | 2019/08/07 10:00 | Sun, F. v Goh, Giap Chin | W | 2-0 |
| Hyderabad Open 2019, MS | 2019/08/06 14:10 | Sun, F. v Xiaodong Sheng | W | 2-0 |
| Open de Thaïlande - Qualif. | 2019/07/30 07:40 | Kuncoro, Sony Dwi v Sun, F. | L | 2-0 |
| Open de Thaïlande - Qualif. | 2019/07/30 03:45 | Sun, F. v Rouxel, Thomas | W | 2-0 |
| US Open 2019, MS | 2019/07/13 03:25 | Saensomboonsuk, Tanongsak v Sun, F. | L | 2-1 |