Round: 27
| Challenger Drummondville Qual | 2018/03/12 22:55 | Frederik Nielsen v Aleksandar Vukic | 2-6,4-6 |
| Challenger Drummondville Qual | 2018/03/11 17:15 | Frederik Nielsen v Pavel Krainik | View |
| ITF Canada F2 | 2018/03/06 15:00 | Frederik Nielsen v Jared Hiltzik | 4-6,6-4,2-6 |
| ITF Canada F2 Qual | 2018/03/05 14:30 | Frederik Nielsen v Ricardo Rodriguez-Pace | 3-6,6-3,6-4 |
| ITF Canada F2 Qual | 2018/03/04 15:00 | Frederik Nielsen v Luis David Martinez | 6-3,6-4 |
| ITF Canada F1 | 2018/02/27 16:00 | Deiton Baughman v Frederik Nielsen | 6-3,6-3 |
| ITF Great Britain F3 | 2018/02/14 13:40 | Ronnie Schneider v Frederik Nielsen | 6-2,6-4 |
| ITF Great Britain F3 | 2018/02/13 14:55 | Frederik Nielsen v Yannick Jankovits | 6-2,3-6,6-3 |
| ITF Portugal F6 | 2018/03/29 14:40 | Karim-Mohamed Maamoun v Robin Stanek | 6-7,1-6 |
| ITF Portugal F6 | 2018/03/28 09:30 | Karim-Mohamed Maamoun v Tobias Simon | 6-1,6-1 |
| ITF Portugal F6 | 2018/03/27 09:00 | Karim-Mohamed Maamoun v Vullnet Tashi | 6-3,4-6,6-1 |
| ITF Portugal F5 Qual | 2018/03/22 10:00 | Karim-Mohamed Maamoun v Romain Barbosa | 6-3,2-6,6-7 |
| ITF Portugal F5 | 2018/03/21 17:05 | Karim-Mohamed Maamoun v Daniel Rodrigues | 6-2,6-2 |
| ITF Egypt F9 | 2018/03/14 08:00 | Karim-Mohamed Maamoun v Dominic Weidinger | 6-1,6-1 |
| ITF Egypt F8 | 2018/03/11 08:00 | Lucas Miedler v Karim-Mohamed Maamoun | 6-3,6-4 |
| ITF Egypt F8 | 2018/03/10 08:00 | Lloyd Harris v Karim-Mohamed Maamoun | 6-4,6-7,4-6 |