Stadium: Court 1 Round: 45 Ground: Clay
| Challenger Lexington | 2018/07/31 17:55 | Ronnie Schneider v Igor Sijsling | 6-2,6-4 |
| ITF Germany F5 | 2018/06/27 15:25 | Filip Bergevi v Igor Sijsling | 6-1,6-2 |
| ITF Germany F5 | 2018/06/25 09:00 | Igor Sijsling v Jannik Rother | 6-1,6-3 |
| ITF Germany F5 | 2018/06/25 08:00 | Igor Sijsling v Quentin Folliot | 6-2,6-4 |
| Challenger Loughborough Qual | 2018/05/21 12:20 | Igor Sijsling v Jurij Rodionov | 6-7,3-6 |
| Challenger Loughborough Qual | 2018/05/20 14:30 | Igor Sijsling v Peter Bothwell | 6-4,6-2 |
| Challenger Loughborough Qual | 2018/05/19 17:20 | Igor Sijsling v Julian Ocleppo | 6-4,6-7,6-1 |
| Challenger Heilbronn | 2018/05/17 11:00 | Igor Sijsling v Jiri Vesely | 3-6,6-4,2-6 |
| Challenger San Benedetto | 2018/07/17 11:00 | Facundo Arguello v Tomislav Brkic | 4-6,6-1,0-6 |
| Challenger Perugia | 2018/07/10 16:55 | Facundo Arguello v Alessandro Giannessi | 6-3,4-6,2-6 |
| Challenger Recanati | 2018/07/05 15:30 | Facundo Arguello v Salvatore Caruso | 4-6,2-6 |
| Challenger Recanati | 2018/07/03 14:00 | Facundo Arguello v Raul Brancaccio | 6-1,3-6,6-3 |
| Challenger Milan | 2018/06/26 10:20 | Facundo Arguello v Pedro Sousa | 6-4,4-6,4-6 |
| ITF Argentina F3 | 2018/06/02 14:00 | Facundo Arguello v Gonzalo Villanueva | 6-4,7-6 |
| ITF Argentina F3 | 2018/06/01 17:00 | Facundo Arguello v Santiago Rodriguez Taverna | 6-0,6-2 |
| ITF Argentina F3 | 2018/05/31 15:50 | Facundo Arguello v Camilo Ugo Carabelli | 6-1,6-2 |