Stadium: Court 5 Round: 54 Ground: Hardcourt indoor
| ITF USA F29 | 2018/11/01 20:00 | Jan Zielinski v Haru Inoue | 5-7,5-7 |
| ITF USA F29 | 2018/10/30 16:35 | Cameron Green v Jan Zielinski | 4-6,3-6 |
| ITF Poland F6 | 2018/08/11 10:00 | Jan Zielinski v Maciej Rajski | 5-7,1-6 |
| ITF Poland F6 | 2018/08/10 10:00 | Pawel Juszczak v Jan Zielinski | 6-2,6-7,1-6 |
| ITF Poland F6 | 2018/08/08 11:00 | Jan Zielinski v Eduardo Dischinger | 6-3,6-3 |
| ITF Poland F6 | 2018/08/07 10:35 | Piotr Galus v Jan Zielinski | 3-6,5-7 |
| ITF Poland F6 Qual | 2018/08/06 08:00 | Max Steinberger v Jan Zielinski | 4-6,0-6 |
| ITF Poland F6 Qual | 2018/08/05 12:30 | Jan Zielinski v Norbert Tadyszak | 6-0,6-0 |
| ITF M15 Oslo | 2019/03/04 09:00 | Jonathan Stenberg v Simon Yitbarek | 0-6,5-7 |
| ITF Sweden F5 | 2018/10/02 13:40 | Jonathan Stenberg v Alexander Zgirovsky | 2-6,2-6 |
| ITF Sweden F5 | 2018/09/29 11:45 | Jonathan Stenberg v Erik Grevelius | 6-3,6-2 |
| ITF Sweden F4 | 2018/09/25 14:50 | Jonathan Stenberg v Jonathan Mridha | 2-6,3-6 |
| ITF Sweden F4 | 2018/09/23 10:40 | Jonathan Stenberg v Arslanbek Temirhanov | 6-0,6-4 |
| ITF Sweden F4 | 2018/09/22 12:35 | Jonathan Stenberg v Karl Fredrik Utheim | 6-1,6-2 |
| ITF Austria F5 | 2018/07/31 08:00 | Jonathan Stenberg v Sven Lah | 1-6,2-6 |
| ITF Austria F4 Qual | 2018/07/21 10:00 | Jonathan Stenberg v Stefano Battaglino | 1-6,7-6,3-6 |