Stadium: TK PALILULA C4 Round: 25 Ground: Clay
| ITF M15 Skopje | 2021/05/31 08:00 | Niels Visker v Lazar Milicevic | 6-7,6-3,12-10 |
| ITF M15 Skopje | 2021/05/30 07:00 | Lazar Milicevic v Strahinja Rakic | 5-7,6-0,10-4 |
| ITF M15 Brčko | 2021/05/21 09:25 | Matheus P De Almeida v Lazar Milicevic | 7-5,7-5 |
| ITF M15 Brčko | 2021/05/18 12:00 | Lazar Milicevic v Dusan Rajic | 7-6,6-4 |
| ITF M15 Brčko | 2021/05/18 07:00 | Yann Wojcik v Lazar Milicevic | 4-6,4-6 |
| ITF M15 Prijedor | 2021/05/11 08:00 | Kristijan Juhas v Lazar Milicevic | 6-3,6-0 |
| ITF M15 Prijedor | 2021/05/10 09:15 | Dusan Rajic v Lazar Milicevic | 2-6,2-6 |
| ITF M15 Prijedor | 2021/05/09 09:30 | Lazar Milicevic v Stefan Micov | 6-1,6-2 |
| ITF M25 Bělehrad | 2021/06/29 07:00 | Daniel Cukierman v Mirko Martinez | 6-1,6-4 |
| ITF M25 Bělehrad | 2021/06/28 07:00 | Petar Pjevcevic v Mirko Martinez | 2-6,2-6 |
| ITF M25 Bělehrad | 2021/06/27 07:00 | Maxim Krapivin v Mirko Martinez | 0-6,5-7 |
| ITF M25 Klosters | 2021/06/24 10:15 | Francesco Forti v Mirko Martinez | 6-3,6-4 |
| ITF M25 Klosters | 2021/06/22 06:55 | Mirko Martinez v Mika Brunold | 6-2,7-5 |
| ITF M15 Janov | 2021/06/15 08:55 | Mirko Martinez v Leopold Zima | 5-7,4-6 |
| ITF M15 Janov | 2021/06/14 07:00 | Wishaya Trongcharoenchaikul v Mirko Martinez | 4-6,3-6 |
| ITF M15 Sarajevo | 2021/06/02 11:25 | Gergely Madarasz v Mirko Martinez | 6-2,7-6 |