Stadium: Court 4 Round: 54 Ground: Carpet indoor
| ITF Estonia F3 | 2018/11/03 11:00 | Hartmeier, Patrik v Tiainen, Jussi | 3-6,2-6 |
| ITF Finland F3 | 2018/08/12 10:00 | Tiainen, Jussi v Saatela, Leevi | 4-6,3-6 |
| ITF Finland F3 | 2018/08/11 10:00 | Tiainen, Jussi v Gabriele Moghini | 6-2,2-6,7-6 |
| ITF Finland F2 Qual | 2018/08/04 10:00 | Justin Roberts v Tiainen, Jussi | 6-3,6-4 |
| ITF Finland F1 Qual | 2018/07/29 07:00 | Tiainen, Jussi v Prandstetter, Aaron | 3-6,4-6 |
| ITF Finland F1 Qual | 2018/07/28 07:00 | Tiainen, Jussi v Dagan, Guy | 6-3,3-6,6-2 |
| ITF Finland F3 Qual | 2017/08/12 09:30 | Acquaroli, Gianluca v Tiainen, Jussi | 6-1,6-1 |
| ITF Finland F2 Qual | 2017/08/07 08:20 | Solberg, Christoffer v Tiainen, Jussi | 6-2,6-3 |
| ITF Estonia F3 | 2018/11/03 11:00 | Vajda, Peter v Slavic, Nikola | 6-1,6-2 |
| ITF Egypt F22 | 2018/10/07 08:00 | Ricci, Alessandro v Vajda, Peter | 4-6,6-4,6-1 |
| ITF Hungary F7 | 2018/08/27 09:55 | Marcell Bartakovics v Vajda, Peter | 7-6,6-2 |
| ITF Hungary F7 | 2018/08/25 08:00 | Petko, Leon v Vajda, Peter | 2-6,1-6 |
| ITF Slovakia F3 | 2018/08/05 10:00 | Sprlak Puk, Albert v Vajda, Peter | 6-2,6-4 |
| ITF Slovakia F2 | 2018/08/01 09:25 | Vajda, Peter v Semjan, Marek | 4-6,4-6 |
| ITF Slovakia F1 | 2018/07/23 09:00 | Vajda, Peter v Jirousek, Tomas | 0-6,3-6 |
| ITF Slovakia F1 | 2018/07/22 08:00 | Vajda, Peter v Pavlovic, Marko | 6-3,6-1 |