Stadium: Court 3 Round: 14 Ground: Clay
| Challenger - Murcia | 2021/09/26 09:00 | Mariano Kestelboim v Carlos Sanchez Jover | 3-6,6-2,6-7 |
| ITF M25 - Madrid | 2021/09/15 06:50 | Arnaud Bovy v Mariano Kestelboim | 7-6,6-2 |
| ITF M25 - Eupen | 2021/09/10 11:30 | Mariano Kestelboim v Maxime Pauwels | 6-7,4-6 |
| ITF M25 - Eupen | 2021/09/09 11:45 | Mariano Kestelboim v Juan Ignacio Galarza | 6-4,6-2 |
| ITF M25 - Eupen | 2021/09/08 07:30 | Mariano Kestelboim v Niklas Schell | 6-3,6-3 |
| ITF M25 - Überlingen | 2021/08/17 15:00 | Mariano Kestelboim v Ryan Harrison | 3-6,6-4,2-6 |
| ITF M25 - Frankfurt am Main | 2021/08/13 09:50 | Mariano Kestelboim v Yshai Oliel | 2-6,2-6 |
| ITF M25 - Frankfurt am Main | 2021/08/12 11:10 | Taiyo Yamanaka v Mariano Kestelboim | 2-6,2-6 |
| ITF M15 - Cairo | 2021/09/24 11:25 | Valerio Aboian v Gabriele Maria Noce | 3-6,4-6 |
| ITF M15 - Cairo | 2021/09/23 08:00 | Valerio Aboian v Andrea Picchione | 6-2,6-4 |
| ITF M15 - Cairo | 2021/09/22 08:00 | Davide Galoppini v Valerio Aboian | 6-2,2-6,4-6 |
| ITF M15 - Cairo | 2021/09/21 08:00 | Valerio Aboian v Gian Marco Ortenzi | 7-6,6-3 |
| ITF M15 - Cairo | 2021/09/20 08:00 | Valerio Aboian v Karim El Feky | 6-0,6-1 |
| ITF M15 - Cairo | 2021/09/19 10:30 | Valerio Aboian v Elbert Barr | 6-3,6-2 |
| ITF M15 - Cairo | 2021/09/16 08:00 | Valerio Aboian v Luca Tomasetto | 3-6,6-1,2-6 |
| ITF M15 - Cairo | 2021/09/15 08:00 | Davide Galoppini v Valerio Aboian | 4-6,7-6,1-6 |