Round: 25 Ground: Hardcourt outdoor
| ITF Chile F1 | 2017/11/25 14:15 | Juan Carlos Saez v Mariano Kestelboim | 4-6,3-6 |
| ITF Argentina F6 | 2017/09/05 15:30 | Mariano Kestelboim v Juan Carlos Saez | 7-6,4-6,6-4 |
| Challenger de Santiago - Clasificación | 2018/03/03 19:50 | Gian Marco Moroni v Juan Carlos Saez | 6-4,5-7,7-5 |
| Challenger de Punta del Este - Clasificación | 2018/02/25 18:00 | Juan Ignacio Londero v Juan Carlos Saez | 6-1,6-3 |
| Challenger de Punta del Este - Clasificación | 2018/02/24 16:15 | Juan Carlos Saez v Alejandro Tabilo | 1-6,6-2,6-3 |
| ITF Chile F3 - Masculino | 2017/12/06 17:00 | Nicolas Alberto Arreche v Juan Carlos Saez | 6-3,6-2 |
| ITF Chile F3 - Masculino | 2017/12/05 13:00 | Martin Facundo Carrizo v Juan Carlos Saez | 2-6,0-6 |
| ITF Chile F2 | 2017/12/03 14:00 | Fabrizio Ornago v Juan Carlos Saez | 4-6,2-6 |
| ITF Chile F2 | 2017/12/02 16:40 | Juan Carlos Saez v Tomas Barrios Vera | 7-5,3-6,7-6 |
| ITF Chile F2 | 2017/12/01 16:00 | Juan Carlos Saez v Luciano Doria | 6-3,7-5 |
| ITF Túnez F10 | 2018/03/16 09:00 | Hernan Casanova v Mariano Kestelboim | 6-1,7-5 |
| ITF Túnez F10 | 2018/03/15 11:20 | Nico Mertens v Mariano Kestelboim | 4-6,2-6 |
| ITF Túnez F10 | 2018/03/14 12:45 | Jacopo Stefanini v Mariano Kestelboim | 4-6,0-6 |
| ITF Túnez F8 | 2018/03/02 08:30 | Mariano Kestelboim v Tak Khunn Wang | 1-6,3-6 |
| ITF Túnez F8 | 2018/03/01 10:10 | Mariano Kestelboim v Samm Butler | 6-3,6-1 |
| ITF Túnez F8 | 2018/02/27 09:00 | Mariano Kestelboim v Filip Duda | 2-6,7-5,6-3 |
| ITF Túnez F7 | 2018/02/23 09:30 | Matteo Martineau v Mariano Kestelboim | 5-7,6-0,7-6 |
| ITF Túnez F7 | 2018/02/22 10:45 | Nicolas Alberto Arreche v Mariano Kestelboim | 7-5,6-7,0-6 |