Stadion: Court 2 Round: 26 Ground: Hardcourt indoor
| ITF - M15 - St. Petersburg | 2021/04/07 07:00 | Savriyan Danilov v Matic Spec | 3-6,2-6 |
| ITF - M15 - St. Petersburg | 2021/04/05 08:40 | Constantin Bittoun Kouzmine v Matic Spec | 6-7,6-7 |
| ITF - M15 - St. Petersburg | 2021/04/04 09:05 | Semen Voronin v Matic Spec | 4-6,3-6 |
| ITF - M15 - Opatija | 2021/03/24 12:45 | Matic Spec v Pavel Nejedly | 6-1,5-7,3-6 |
| ITF - M15 - Opatija | 2021/03/23 09:00 | Matic Spec v Domagoj Biljesko | 7-5,6-2 |
| ITF - M15 - Opatija | 2021/03/22 11:55 | Matic Spec v Lucas Bouquet | 6-1,6-1 |
| ITF - M15 - Opatija | 2021/03/21 11:00 | Matic Spec v Federico Marchetti | 7-5,6-0 |
| ITF - M15 - Rovinj | 2021/03/14 08:30 | Matic Spec v Duje Kekez | 3-6,4-6 |
| ITF - M15 - St. Petersburg | 2021/04/06 07:00 | Alexander Wolfschmidt v Aristarkh Safonov | 6-4,1-6,5-7 |