Stadium: Court 4 Round: 44 Ground: Clay
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2021/05/31 12:00 | Domagoj Biljesko v Stevan Popovic | 6-1,6-2 |
| ITF - M25 Kiseljak | 2021/05/26 10:00 | Domagoj Biljesko v Heger, Tim | 6-7,6-2,3-6 |
| ITF - M15 Brcko | 2021/05/21 11:20 | Dubrivnyy, Artem v Domagoj Biljesko | 6-4,7-6 |
| ITF - M15 Brcko | 2021/05/18 14:00 | Domagoj Biljesko v Maikel De Boes | 6-3,7-5 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/20 08:00 | Domagoj Biljesko v Christian Sigsgaard | 6-1,6-7,4-10 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/19 09:15 | Domagoj Biljesko v Luka Mikrut | 6-4,7-5 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/18 10:00 | Domagoj Biljesko v Samosi, Peter | 6-2,6-2 |
| ITF - M15 Opatija | 2021/03/23 09:00 | Spec, Matic v Domagoj Biljesko | 7-5,6-2 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2021/05/30 07:30 | Vianello, Michele v Lukas Palovic | 7-5,6-4 |
| ITF - M15 Bucarest | 2021/05/23 10:30 | Valentin Royer v Vianello, Michele | 6-2,6-1 |
| ITF M15 Cairo | 2021/05/02 09:00 | Vianello, Michele v Niccolo Catini | 2-6,1-6 |
| ITF M15 Cairo | 2021/04/25 07:30 | Kawakami, Rimpei v Vianello, Michele | 6-2,6-4 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/18 13:00 | Vianello, Michele v Schiavetti, Pietro | 7-5,5-7,13-15 |
| ITF - M15 Antalya | 2021/01/12 07:00 | Vianello, Michele v Ilya Snitari | 1-6,0-6 |
| ITF - M15 Antalya | 2021/01/11 07:00 | Battaglino, Stefano v Vianello, Michele | 6-0,5-7,2-10 |
| ITF - M15 Antalya | 2021/01/10 06:00 | Tasenkov, Vladislav v Vianello, Michele | 2-6,2-6 |