Estadio: Court 3 Round: 25 Ground: Clay
| ITF Argentina F1 | 2018/05/14 15:00 | Ryusei Makiguchi v Juan Carlos Saez | 2-6,5-7 |
| ITF Argentina F1 | 2018/05/14 15:00 | Ryusei Makiguchi v Juan Carlos Saez | 2-6,5-7 |
| ITF Brasil F2 | 2018/05/01 20:35 | Ryusei Makiguchi v Camilo Ugo Carabelli | 2-6,0-6 |
| ITF Brasil F1 | 2018/04/25 18:15 | Wilson Leite v Ryusei Makiguchi | 6-4,5-7,6-4 |
| ITF Brasil F1 | 2018/04/23 16:35 | Ryusei Makiguchi v Caio Silva | 6-1,6-7,7-5 |
| ITF Italia F6 - Clasificación | 2018/04/01 12:00 | Paul Woerner v Ryusei Makiguchi | 6-4,6-4 |
| ITF Italia F6 - Clasificación | 2018/03/31 12:00 | Ryusei Makiguchi v Stefano Reitano | 7-5,6-2 |
| ITF Túnez F12 | 2018/03/28 10:05 | Jacopo Stefanini v Ryusei Makiguchi | 6-1,2-6,6-4 |
| ITF Túnez F11 | 2018/03/18 10:30 | Jordi Munoz-Abreu v Ryusei Makiguchi | 7-5,5-7,6-0 |
| ITF Argentina F1 | 2018/05/16 15:00 | Tomas Farjat v Juan Carlos Saez | 6-4,6-4 |
| ITF Argentina F1 | 2018/05/14 15:00 | Ryusei Makiguchi v Juan Carlos Saez | 2-6,5-7 |
| ITF España F10 | 2018/04/24 08:00 | Juan Carlos Saez v Mario Vilella Martinez | 4-6,4-6 |
| ITF España F9 | 2018/04/20 09:30 | Pedro Cachin v Juan Carlos Saez | 2-6,6-1,6-2 |
| ITF España F9 | 2018/04/18 09:00 | Michiel de Krom v Juan Carlos Saez | 5-7,0-6 |
| ITF Túnez F14 | 2018/04/10 11:00 | Michael Vrbensky v Juan Carlos Saez | 6-2,6-4 |
| ITF Túnez F13 | 2018/04/05 09:00 | Matej Vocel v Juan Carlos Saez | 6-3,6-2 |
| ITF Túnez F13 | 2018/04/03 09:00 | Bernardo Saraiva v Juan Carlos Saez | 7-6,4-6,6-7 |