Stadium: Court 3 Round: 25 Ground: Hardcourt indoor
| 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 |
| ITF Austria F3 | 2018/07/14 07:15 | Lukas Vejvara v Jonathan Stenberg | 7-5,4-6,6-3 |
| ITF Austria F2 | 2018/07/09 12:00 | Johannes Haerteis v Jonathan Stenberg | 6-1,7-5 |
| ITF Austria F2 | 2018/07/08 08:00 | Jonathan Stenberg v Jonathan Morr | 5-7,4-6 |
| ITF Austria F2 | 2018/07/07 08:00 | Jonathan Stenberg v Christian Fellin | 6-1,6-0 |
| Davis Cup | 2018/09/16 13:45 | Sandro Ehrat v Jonathan Mridha | 6-4,3-6,4-6,6-7 |
| Davis Cup | 2018/09/14 15:00 | Henri Laaksonen v Jonathan Mridha | 7-6,6-2,6-3 |
| ITF Italy F26 | 2018/09/06 09:40 | Jonathan Mridha v Gijs Brouwer | 4-6,6-7 |
| ITF Italy F26 | 2018/09/05 11:30 | Lorenzo Brunetti v Jonathan Mridha | 3-6,4-6 |
| ITF Italy F26 | 2018/09/04 15:10 | Jonathan Mridha v Maxime Chazal | 6-4,6-4 |
| Challenger Cordenons | 2018/08/13 11:20 | Jonathan Mridha v Enzo Couacaud | 4-6,3-6 |
| Challenger Cordenons | 2018/08/12 12:40 | Jonathan Mridha v Artem Dubrivnyy | 6-1,6-2 |
| Challenger Cordenons | 2018/08/11 10:45 | Hugo Grenier v Jonathan Mridha | 4-6,2-6 |