| Dutch Open | 2018/10/09 16:00 | Birger Abts v Joonas Korhonen | W | 1-2 |
| Swiss Open - WD - Kwalifikacje | 2018/10/09 09:54 | Michael Spencer-Smith v Joonas Korhonen | W | 0-2 |
| Swiss Open - WD - Kwalifikacje | 2018/09/21 08:10 | Wei Chi Liu v Joonas Korhonen | L | 2-1 |
| Giraldilla Int. XD | 2018/04/13 13:20 | Joonas Korhonen v Toby Penty | L | 0-2 |
| Swiss Open - WD - Kwalifikacje | 2018/04/12 14:55 | Karl Thor S'gaard v Joonas Korhonen | W | 0-2 |
| Swiss Open - WD - Kwalifikacje | 2018/03/08 14:00 | Valentin Singer v Joonas Korhonen | W | 1-2 |
| Swiss Open - WD - Kwalifikacje | 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 |
| Giraldilla Int. XD | 2018/10/03 05:20 | Lucas Corvee v Kim Bruun | L | 0-2 |
| Indonesia Masters - XD | 2018/09/26 05:00 | Lucas Corvee v Anthony Sinisuka Ginting | L | 0-2 |
| All England Open | 2018/07/30 07:00 | Lucas Corvee v Sameer Verma | L | 0-2 |
| Indonesia Masters - XD | 2018/07/18 11:00 | Kean Yew Loh v Lucas Corvee | L | 2-0 |
| Thailand Open | 2018/07/11 08:40 | Lucas Corvee v Suppanyu Avihingsanon | L | 0-2 |
| Giraldilla Int. XD | 2018/06/17 08:00 | Lucas Corvee v Toma Junior Popov | L | 0-2 |
| Giraldilla Int. XD | 2018/06/16 14:30 | Lucas Corvee v Felix Burestedt | W | 2-0 |
| Giraldilla Int. XD | 2018/06/15 14:35 | Lucas Corvee v Luis Enrique Penalver | W | 2-1 |