Stadium: Court 6 Round: 26 Ground: Clay
| ITF Germany F6 | 2018/07/03 14:40 | Igoshin, Alexander v Alex Knaff | 6-7,3-6 |
| ITF Belgium F2 | 2018/06/27 11:25 | Alex Knaff v Meis, Pascal | 3-6,6-4,4-6 |
| ITF Belgium F2 Qual | 2018/06/25 09:45 | Alex Knaff v Damiens, Antoine | 5-7,6-3,6-4 |
| ITF Belgium F2 Qual | 2018/06/24 11:00 | Alex Knaff v Sudzum, Marcel Marlon | 6-1,2-6,6-4 |
| ITF Belgium F1 Qual | 2018/06/17 11:00 | Alex Knaff v Daniel De Jonge | 3-6,3-6 |
| Coupe Davis | 2018/04/08 10:30 | Alex Knaff v Shubladze, Vazha | 6-1,6-2 |
| ITF USA F40 | 2017/12/07 16:00 | Alex Knaff v Dunbar, Jacob | 2-6,4-6 |
| ITF USA F40 | 2017/12/06 20:30 | Krajicek, Austin v Alex Knaff | 6-4,1-6,4-6 |
| ITF Germany F6 | 2018/07/04 10:00 | Robert Strombachs v Christoph Negritu | 2-6,1-6 |
| Challenger Heilbronn Qual | 2018/05/13 09:00 | Christoph Negritu v Igor Sijsling | 4-6,0-6 |
| Challenger Heilbronn Qual | 2018/05/12 09:00 | Surchenko, Dmitry v Christoph Negritu | 5-7,1-6 |
| Tunisia F15, Singles Qualifying | 2018/04/17 11:10 | Christoph Negritu v Butler, Samm | 3-6,3-6 |
| Tunisia F14, Singles Qualifying | 2018/04/13 09:00 | Christoph Negritu v Crepatte, Baptiste | 2-6,3-6 |
| Tunisia F14, Singles Qualifying | 2018/04/12 09:00 | Christoph Negritu v Robert, Quentin | 5-7,6-3,6-2 |
| Tunisia F14, Singles Qualifying | 2018/04/10 09:00 | Konecny, Michal v Christoph Negritu | 4-6,4-6 |
| ITF Tunisia F13 | 2018/04/07 09:00 | Perez Sanz, David v Christoph Negritu | 6-4,6-2 |