Ground: Clay
| ITF Serbia F6 | 2015/07/20 08:00 | Kolisnyk, Olexiy v Zelba, Marious | 6-7,6-3,6-3 |
| ITF Serbia F6 | 2015/07/19 07:00 | Matejcek, Mario v Zelba, Marious | 2-6,2-6 |
| ITF Serbia F6 | 2015/07/18 07:00 | Wakita, Shunsuke v Zelba, Marious | 0-6,1-6 |
| ITF Serbia F6 | 2015/07/12 11:00 | Rakic, Strahinja v Zelba, Marious | 6-4,0-6,6-3 |
| ITF Serbia F6 | 2015/07/06 09:25 | Zelba, Marious v Krivokuca, Neven | 1-6,6-2,6-4 |
| ITF Belgium F1 | 2015/06/09 12:20 | Zelba, Marious v Barbosa, Romain | 5-7,3-6 |
| ITF Australia F3 | 2015/03/10 01:20 | Polkinghorne, Darren v Zelba, Marious | 4-6,6-4,6-3 |
| ITF Australia F2 | 2015/03/03 01:50 | Hobart, Daniel v Zelba, Marious | 6-3,6-2 |
| ITF Russia F8 | 2014/09/06 10:15 | Komarov, Kirill v Klimov, Philipp | 2-6,6-3,6-1 |