Round: 62 Ground: Clay
| ITF Germany F8 Qual | 2018/07/15 08:00 | Puodziunas, Scott v Hellfritsch, Lucas | 6-3,6-3 |
| ITF Germany F6 | 2018/07/02 09:00 | Hellfritsch, Lucas v Boris Fassbender | 5-7,2-6 |
| ITF Germany F4 | 2018/06/16 08:00 | Matthew Dellavedova v Hellfritsch, Lucas | 6-4,6-1 |
| Turkey F14, Singles Qualifying | 2018/04/08 07:30 | Hellfritsch, Lucas v Maresca, Santiago | 3-6,5-7 |
| Turkey F14, Singles Qualifying | 2018/04/07 11:00 | Guttau, Niklas v Hellfritsch, Lucas | 4-6,3-6 |
| ITF Turkey F13 | 2018/03/31 11:00 | Francisco Cerundolo v Hellfritsch, Lucas | 6-4,6-2 |
| ITF Portugal F6 Qual | 2018/03/24 13:00 | Hellfritsch, Lucas v Leote Prata, Martim | 6-4,4-6,3-6 |
| Portugal F4, Singles Qualifying | 2018/03/13 11:00 | Hellfritsch, Lucas v Niesten, Miliaan | 0-6,2-6 |
| ITF Germany F8 Qual | 2018/07/15 08:00 | Maik Steiner v Walterscheid-Tukic, Nikolas | 4-6,2-6 |
| ITF Germany F8 Qual | 2017/07/17 11:00 | Ruepke, Lukas v Maik Steiner | 6-3,6-0 |
| ITF Germany F7 | 2017/07/09 08:00 | Quentin Folliot v Maik Steiner | 6-3,6-2 |