Stadium: Court 6 Round: 62 Ground: Clay
| ITF M25 Velenje | 2021/07/07 08:00 | Oscar Jose Gutierrez v Constantin Bittoun Kouzmine | 4-6,6-3,6-4 |
| ITF M25 Velenje | 2021/07/06 08:00 | Constantin Bittoun Kouzmine v Lukas Palovic | 6-2,2-6,10-8 |
| ITF M25 Velenje | 2021/07/04 07:30 | Constantin Bittoun Kouzmine v Francisco Vittar | 7-5,6-1 |
| ITF M25 The Hague | 2021/07/01 17:00 | Constantin Bittoun Kouzmine v Tim Van Rijthoven | 5-7,4-6 |
| ITF M25 The Hague | 2021/07/01 07:30 | Sidane Pontjodikromo v Constantin Bittoun Kouzmine | 6-7,2-6 |
| ITF M25 The Hague | 2021/06/28 07:55 | Dominik Palan v Constantin Bittoun Kouzmine | 6-2,2-6,6-10 |
| ITF M25 The Hague | 2021/06/27 08:00 | Roland Stuurman v Constantin Bittoun Kouzmine | 2-6,1-6 |
| ITF M25 Alkmaar | 2021/06/20 17:00 | Constantin Bittoun Kouzmine v Michiel de Krom | 3-6,3-6 |
| ITF M15 Skopje | 2021/06/07 08:30 | Nicolo Turchetti v Samuele Pieri | 4-6,6-0,10-8 |
| ITF M15 Skopje | 2021/05/31 12:30 | Petr Michnev v Samuele Pieri | 6-2,6-3 |
| ITF M15 Skopje | 2021/05/30 12:30 | Dmitrii Vasilev v Samuele Pieri | 4-6,4-6 |
| ITF M15 Monastir | 2021/05/17 13:30 | Maxence Beauge v Samuele Pieri | 6-2,6-2 |
| ITF M15 Monastir | 2021/05/16 11:00 | Alfredo Casso v Samuele Pieri | 1-6,1-6 |
| ITF M15 Monastir | 2021/05/09 10:00 | Samuele Pieri v Fausto Tabacco | 6-4,5-7,3-10 |
| ITF M15 Monastir | 2021/03/14 10:00 | Yannick Stephan Born v Samuele Pieri | 6-3,3-6,10-7 |
| ITF M15 Monastir | 2021/03/08 12:30 | Samuele Pieri v Luigi Sorrentino | 1-6,2-6 |