Stadium: Court 6 Round: 54 Ground: Hardcourt indoor
| ITF M15 St Petersburg | 2021/04/04 11:55 | Jaimee Floyd Angele v Constantin Bittoun Kouzmine | 6-1,1-6,7-10 |
| ITF - M15 Poitiers | 2021/03/14 11:45 | Constantin Bittoun Kouzmine v Stouff, Vincent | 6-3,6-7,7-10 |
| ITF M15 Bratislava | 2021/03/10 10:30 | Constantin Bittoun Kouzmine v Vitaliy Sachko | 6-3,2-6,3-6 |
| ITF M15 Bratislava | 2021/03/09 09:00 | Dobry, Martin v Constantin Bittoun Kouzmine | 3-6,0-6 |
| ITF M15 Bratislava | 2021/03/08 15:00 | Jan Jermar v Constantin Bittoun Kouzmine | 6-7,2-6 |
| ITF M15 Bratislava | 2021/03/04 09:00 | Crepatte, Baptiste v Constantin Bittoun Kouzmine | 5-7,6-4,6-3 |
| ITF M15 Bratislava | 2021/03/03 12:10 | Constantin Bittoun Kouzmine v Minarik, Kristof | 2-6,6-4,6-4 |
| ITF M15 Bratislava | 2021/03/02 09:00 | Constantin Bittoun Kouzmine v Yvo Panak | 6-3,6-0 |
| 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 Rovinj | 2021/03/14 08:30 | Spec, Matic v Kekez, Duje | 3-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/03 13:50 | Roman Andres Burruchaga v Spec, Matic | 6-2,6-2 |
| ITF - M15 Sharm El Sheikh | 2021/03/02 07:30 | Spec, Matic v Francesco Passaro | 6-7,6-3,11-9 |