| Slovenia Int. | 2019/05/16 08:30 | Kalle Koljonen v Kartikey Gulshan Kumar | W | 2-1 |
| Denmark Int. | 2019/05/10 09:00 | Joergensen, J. O. v Kalle Koljonen | W | 0-2 |
| Finnish Open | 2019/04/05 16:45 | Chun-Yi Lin v Kalle Koljonen | L | 2-0 |
| Finnish Open | 2019/04/05 09:00 | Moreels, Maxime v Kalle Koljonen | W | 0-2 |
| Open de Suisse | 2019/03/13 09:50 | Kalle Koljonen v Ygor Coelho | L | 1-2 |
| Open de Suisse - Doubles Femmes - Qualif. | 2019/03/12 14:20 | Koki Watanabe v Kalle Koljonen | W | 0-2 |
| Open de Suisse - Doubles Femmes - Qualif. | 2019/03/12 11:10 | Kalle Koljonen v Luka Wraber | W | 2-0 |
| Open de Suisse - Doubles Femmes - Qualif. | 2019/02/26 09:00 | Messerschmidt, Rasmus v Kalle Koljonen | L | 2-1 |
| Denmark Int. | 2019/05/11 09:00 | Subhankar Dey v Sirant, Sergey | L | 2-0 |
| Denmark Int. | 2019/05/10 16:30 | Koga, Minoru v Sirant, Sergey | W | 1-2 |
| Finnish Open | 2019/04/06 08:00 | Chun-Yi Lin v Sirant, Sergey | L | 2-0 |
| Orléans Masters | 2019/03/19 19:20 | Sirant, Sergey v Lane, Alex | L | 0-2 |
| Estonie Int. - | 2019/01/12 09:00 | Sirant, Sergey v Arnaud Merkle | L | 0-2 |
| Giraldilla Int. XD | 2018/12/14 16:00 | Sirant, Sergey v Nhat Nguyen | L | 0-2 |
| Giraldilla Int. XD | 2018/11/21 08:00 | Sai Praneeth, B. v Sirant, Sergey | L | 2-0 |
| Giraldilla Int. XD | 2018/08/08 10:25 | Xiaodong Sheng v Sirant, Sergey | L | 2-0 |