| US Open 2019, MS, Qualification | 2019/07/09 19:10 | Sun, F. v B.R. Sankeerth | W | 2-1 |
| Canada Open | 2019/07/05 01:40 | Verma, Sourabh v Sun, F. | L | 2-1 |
| Canada Open | 2019/07/03 23:00 | Sun, F. v Kan, C Y | W | 2-1 |
| Australian Open Qual | 2019/06/04 03:30 | Sun, F. v June Wei Cheam | L | 0-2 |
| Australian Open Qual | 2019/06/04 00:10 | Sun, F. v Koki Watanabe | W | 2-1 |
| New Zealand Open 2019, MS | 2019/05/03 05:35 | Sun, F. v Jonatan Christie | L | 0-2 |
| New Zealand Open 2019, MS | 2019/05/02 04:40 | Heo, Kwang Hee v Sun, F. | W | 1-2 |
| New Zealand Open 2019, MS | 2019/04/30 23:40 | Sun, F. v Phetpradab, Khosit | W | 2-1 |
| US Open 2019, MS, Qualification | 2019/07/09 19:10 | Brito Gonzalez, Cesar Adonis v Karan Rajan Rajarajan | W | 0-2 |
| Canada Open | 2019/07/03 17:40 | Ren, P. B. v Karan Rajan Rajarajan | L | 2-1 |
| Canada Open | 2019/07/03 00:40 | Karan Rajan Rajarajan v Munoz, Lino | W | 2-0 |
| Spanish Int. Qual | 2019/06/13 08:10 | Karan Rajan Rajarajan v Schaenzler, Lars | L | 1-2 |
| Spanish Int. Qual | 2019/06/12 13:30 | Rossi, Leo v Karan Rajan Rajarajan | W | 1-2 |
| Spanish Int. Qual | 2019/06/12 11:30 | Karan Rajan Rajarajan v Bernardo Atilano | W | 2-1 |
| Lithuanian Int. | 2019/06/08 08:30 | Karpov, Georgii v Karan Rajan Rajarajan | L | 2-0 |
| Lithuanian Int. | 2019/06/07 11:30 | Rikheim, Vegard v Karan Rajan Rajarajan | W | 1-2 |