Stadium: Court 1 Round: 54 Ground: Hardcourt indoor
| ITF M15 Vyshkovo | 2021/09/22 12:45 | Illya Beloborodko v Constantin Bittoun Kouzmine | 7-6,6-4 |
| ITF M15 Sozopol | 2021/09/14 10:00 | Valentin Vacherot v Constantin Bittoun Kouzmine | 6-3,5-7,6-4 |
| ITF M15 Zilina | 2021/09/02 10:55 | Constantin Bittoun Kouzmine v Fabian Marozsan | 6-7,4-6 |
| ITF M15 Zilina | 2021/09/01 09:55 | Kristof Minarik v Constantin Bittoun Kouzmine | 4-6,2-6 |
| ITF M25 Ueberlingen | 2021/08/18 14:10 | Milan Welte v Constantin Bittoun Kouzmine | 6-4,6-0 |
| ITF M15 Cairo | 2021/08/05 09:20 | Lukas Krainer v Constantin Bittoun Kouzmine | 6-1,6-2 |
| ITF M15 Cairo | 2021/08/04 07:30 | Gabriele Maria Noce v Constantin Bittoun Kouzmine | 0-6,6-3,4-6 |
| ITF M15 Cairo | 2021/08/03 07:30 | Constantin Bittoun Kouzmine v Thiago Cigarran | 6-1,4-6,10-8 |
| ITF M25 Nevers | 2021/10/03 10:15 | Benjamin Ginefri v Hendrik Jebens | 4-6,2-6 |
| ITF M15 Forbach | 2021/09/29 11:00 | Hendrik Jebens v Marlon Vankan | 6-7,4-6 |
| ITF M25 Plaisir | 2021/09/13 09:35 | Hendrik Jebens v Leny Mitjana | 7-5,2-6,4-10 |
| ITF M25 Plaisir | 2021/09/12 11:10 | Hendrik Jebens v Leo Deflandre | 6-4,7-6 |
| ITF M25 Trier | 2021/08/23 09:00 | Hendrik Jebens v Noel Larwig | 4-6,4-6 |
| ITF M25 Ueberlingen | 2021/08/18 12:30 | Hendrik Jebens v Eduard Esteve Lobato | 6-7,3-6 |
| ITF M25 Frankfurt am Main | 2021/08/09 13:50 | Benito Sanchez Martinez v Hendrik Jebens | 3-6,6-4,10-2 |
| ITF M25 Wetzlar | 2021/08/03 09:00 | Hendrik Jebens v Lorenzo Joaquin Rodriguez | 5-7,2-6 |