Round: 45 Ground: Hardcourt outdoor
| ITF Spain F24 | 2018/08/21 11:40 | Ivan Gakhov v Federico Zeballos | 6-1,6-4 |
| ITF Spain F23 | 2018/08/16 09:30 | Federico Zeballos v Lopez San Martin, Alvaro | 3-6,3-6 |
| ITF Spain F23 | 2018/08/15 09:30 | Federico Zeballos v Boris Arias | 6-0,6-2 |
| ITF Spain F22 | 2018/08/10 17:00 | Federico Zeballos v Artunedo Martinav. | 2-6,1-6 |
| ITF Spain F22 | 2018/08/09 18:10 | Federico Zeballos v Canas Garcia, Juan Pablo | 6-7,6-2,6-2 |
| ITF Spain F22 | 2018/08/07 20:00 | Federico Zeballos v Andres F Canovas | 7-5,6-4 |
| Challenger Segovia Qual | 2018/07/29 16:55 | Federico Zeballos v Nam Hoang Ly | 0-6,5-7 |
| Challenger Segovia Qual | 2018/07/28 14:25 | Rodriguez Garcia, Mario v Federico Zeballos | 2-6,0-6 |
| Challenger Meerbusch | 2018/08/14 12:30 | Sieber, Marc v Tatlot, Johan Sebastien | 6-7,6-4,4-6 |
| Meerbusch, Allemagne, Qualifications | 2018/08/13 09:00 | Tristan Lamasine v Sieber, Marc | 6-7,5-7 |
| Meerbusch, Allemagne, Qualifications | 2018/08/12 09:40 | Sieber, Marc v Adrian Oetzbach | 6-0,6-0 |
| Meerbusch, Allemagne, Qualifications | 2018/08/11 11:45 | Mats Rosenkranz v Sieber, Marc | 3-6,3-6 |
| Challenger Pullach Qual | 2018/08/04 09:00 | Sieber, Marc v Lenz, Julian | 4-6,6-4,4-6 |
| Challenger Liberec Qual | 2018/07/29 08:30 | Sieber, Marc v Marvin Moeller | 2-6,5-7 |
| Challenger Liberec Qual | 2018/07/28 08:00 | Juan Pablo Ficovich v Sieber, Marc | 3-6,6-3,3-6 |
| Challenger - Prague | 2018/07/24 11:30 | Nedovyesov, Aleksandr v Sieber, Marc | 6-0,6-4 |