| ITF Estonia F2 | 2018/10/27 08:00 | Nikola Slavic v Gustavs Lukstins | 6-0,6-3 |
| ITF Latvia F1 | 2018/07/28 07:00 | Esteban Bruna v Gustavs Lukstins | 6-4,6-1 |
| ITF Lithuania F1 | 2018/07/21 07:00 | Gustavs Lukstins v Roberts Grinvalds | 5-7,0-6 |
| ITF Estonia F1 | 2018/07/14 08:00 | Gustavs Lukstins v Rudolfs Mednis | 6-7,2-6 |
| ITF Belgium F3 Qual | 2018/07/01 12:00 | Gustavs Lukstins v Sam Taylor | 6-7,2-6 |
| ITF Turkey F6 | 2018/02/10 09:00 | Gustavs Lukstins v Ryuki Matsuda | 0-6,1-6 |
| ITF Turkey F3 | 2018/01/22 10:00 | Muhammet Haylaz v Gustavs Lukstins | 6-1,7-5 |
| ITF Turkey F3 | 2018/01/20 07:00 | Gustavs Lukstins v Amir Hossein Badi | 6-3,2-6,6-2 |
| ITF Estonia F3 | 2018/11/03 14:00 | Tim Heger v Alexander Georg Mandma | 6-4,6-0 |
| ITF Sweden F4 | 2018/09/22 10:30 | Erik Grevelius v Alexander Georg Mandma | 6-4,6-4 |