Stadium: Cancha 3 Round: 19 Ground: Clay
| Challenger Buenos Aires | 2021/10/17 15:35 | Mariano Kestelboim v Valerio Aboian | 6-1,6-2 |
| 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 Ueberlingen | 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 |
| Challenger Buenos Aires | 2021/10/17 16:30 | Luciano Tacchi v Ignacio Monzon | 1-6,2-6 |
| ITF M15 Platja D'Aro | 2021/10/06 11:35 | Bruno P Navarro v Ignacio Monzon | 2-6,6-1,6-2 |
| ITF M15 Melilla | 2021/09/25 07:00 | Mario G Fernandez v Ignacio Monzon | 6-3,3-6,6-4 |
| ITF M15 Melilla | 2021/09/23 15:10 | Raffael Schaer v Ignacio Monzon | 5-7,6-3,2-6 |
| ITF M25 Madrid | 2021/09/14 09:10 | Roberto Ortega-Olmedo v Ignacio Monzon | 6-3,6-2 |
| Challenger Seville | 2021/09/05 09:00 | Ignacio Monzon v Carlos Sanchez Jover | 6-1,3-6,4-6 |
| ITF M15 Huy | 2021/08/25 09:00 | Nicolas Tepmahc v Ignacio Monzon | 6-4,6-3 |
| ITF M15 Oldenzaal | 2021/08/18 09:55 | Ignacio Monzon v Damien Wenger | 2-6,0-6 |