| Croatian International - Qualifikation | 2019/04/18 09:20 | Simon Sandholm v Mateusz Danielak | L | 0-2 |
| Swiss Open - Frauendoppel - Qualifikation | 2018/09/20 16:20 | Simon Sandholm v Johnnie Torjussen | L | 0-2 |
| Slowenien - Future Series | 2019/11/22 10:45 | Joonas Korhonen v Gergo Pytel | W | 2-0 |
| Norwegian International | 2019/11/08 10:30 | Joakim Oldorff v Joonas Korhonen | L | 2-0 |
| SaarLorLux Open | 2019/10/29 19:00 | Yee Han Chong v Joonas Korhonen | L | 2-0 |
| Bulgarian International | 2019/10/06 08:00 | Joonas Korhonen v Dimitar Yanakiev | L | 0-2 |
| Bulgarian International | 2019/10/05 13:30 | Joonas Korhonen v Albin Carl Hjelm | W | 2-1 |
| Bulgarian International | 2019/10/05 07:30 | Peyo Boichinov v Joonas Korhonen | W | 1-2 |
| Bulgarian International | 2019/10/04 13:00 | Joonas Korhonen v Giovanni Toti | W | 2-0 |
| Bulgarian International | 2019/10/04 07:00 | Joonas Korhonen v Julien Scheiwiller | W | 2-0 |