| Giraldilla Int. XD | 2018/07/26 04:40 | Koki Watanabe v Kalle Koljonen | W | 2-0 |
| Thailand Masters | 2019/01/10 10:15 | Guangzu Lu v Koki Watanabe | L | 2-0 |
| Thailand Masters | 2019/01/09 04:00 | Joo Ven Soong v Koki Watanabe | W | 1-2 |
| Swiss Open WD Qual | 2019/01/08 06:00 | Koki Watanabe v Elias Bracke | W | 2-0 |
| Swiss Open WD Qual | 2019/01/08 02:40 | Koki Watanabe v Kantawat Leelavechabutr | W | 2-1 |
| Giraldilla Int. XD | 2018/12/22 20:00 | Koki Watanabe v Kodai Naraoka | W | 2-1 |
| Giraldilla Int. XD | 2018/12/22 02:00 | Jen Hao Hsu v Koki Watanabe | W | 1-2 |
| Giraldilla Int. XD | 2018/12/21 02:05 | Koki Watanabe v Kevin Cordon | W | 2-0 |
| Giraldilla Int. XD | 2018/12/19 20:30 | Misha Zilberman v Koki Watanabe | W | 0-2 |
| Swiss Open WD Qual | 2019/03/12 11:10 | Kalle Koljonen v Luka Wraber | W | 2-0 |
| Swiss Open WD Qual | 2019/02/26 09:00 | Rasmus Messerschmidt v Kalle Koljonen | L | 2-1 |
| Swedish Open | 2019/01/18 15:00 | Alex Lane v Kalle Koljonen | W | 1-2 |
| Swedish Open | 2019/01/18 10:30 | Ditlev Jaeger Holm v Kalle Koljonen | W | 0-2 |
| Giraldilla Int. XD | 2018/11/23 12:40 | Kalle Koljonen v Feixiang Sun | L | 0-2 |
| Giraldilla Int. XD | 2018/11/22 10:40 | Christian Kirchmayr v Kalle Koljonen | W | 0-2 |
| Giraldilla Int. XD | 2018/11/21 18:00 | Gergely Krausz v Kalle Koljonen | W | 0-2 |
| Giraldilla Int. XD | 2018/10/31 17:35 | Kalle Koljonen v Toma Junior Popov | L | 0-2 |