| Giraldilla Int. XD | 2018/04/13 13:20 | Joonas Korhonen v Toby Penty | L | 0-2 |
| Swiss Open WD Qual | 2018/04/12 14:55 | Karl Thor S'gaard v Joonas Korhonen | W | 0-2 |
| Swiss Open WD Qual | 2018/03/08 14:00 | Valentin Singer v Joonas Korhonen | W | 1-2 |
| Swiss Open WD Qual | 2018/03/08 10:30 | Joonas Korhonen v Douglas Lidman | W | 2-0 |
| Giraldilla Int. XD | 2018/01/19 10:00 | Rosario Maddaloni v Joonas Korhonen | L | 2-0 |
| Swiss Open WD Qual | 2018/01/18 10:30 | Richard Kuhl v Joonas Korhonen | W | 0-2 |
| Swiss Open WD Qual | 2018/01/11 18:15 | Joonas Korhonen v Kevin Arokia Walter | W | 2-1 |
| Swiss Open WD Qual | 2018/01/11 07:30 | Marton Szerecz v Joonas Korhonen | W | 1-2 |