Stadium: Court 4 Round: 54 Ground: Hardcourt indoor
| ITF M15 St Petersburg | 2021/04/08 09:00 | Spec, Matic v Aristarkh Safonov | 3-6,5-7 |
| ITF M15 St Petersburg | 2021/04/07 07:00 | Danilov, Savriyan v Spec, Matic | 3-6,2-6 |
| ITF M15 St Petersburg | 2021/04/05 08:40 | Constantin Bittoun Kouzmine v Spec, Matic | 6-7,6-7 |
| ITF M15 St Petersburg | 2021/04/04 09:05 | Semen Voronin v Spec, Matic | 4-6,3-6 |
| ITF - M15 Opatija | 2021/03/24 12:45 | Spec, Matic v Nejedly, Pavel | 6-1,5-7,3-6 |
| ITF - M15 Opatija | 2021/03/23 09:00 | Spec, Matic v Domagoj Biljesko | 7-5,6-2 |
| ITF - M15 Opatija | 2021/03/22 11:55 | Spec, Matic v Lucas Bouquet | 6-1,6-1 |
| ITF - M15 Opatija | 2021/03/21 11:00 | Spec, Matic v Federico Marchetti | 7-5,6-0 |
| ITF M15 St Petersburg | 2021/04/04 07:00 | Ratniuk, Maxim v Maksim Starostin | 6-4,6-0 |