Round: 45 Ground: Grass
| Challenger Loughborough | 2018/05/22 12:30 | Frederik Nielsen v David Guez | 2-6,4-6 |
| Challenger Loughborough Qual | 2018/05/21 09:30 | Johannes Haerteis v Frederik Nielsen | 6-7,1-6 |
| Challenger Loughborough Qual | 2018/05/20 09:30 | Simon Carr v Frederik Nielsen | 3-6,4-6 |
| Challenger Loughborough Qual | 2018/05/19 09:00 | Remi Boutillier v Frederik Nielsen | 7-6,6-7,1-6 |
| Challenger Busan Qual | 2018/05/14 03:30 | Yosuke Watanuki v Frederik Nielsen | 1-6,6-4,6-0 |
| Challenger Busan Qual | 2018/05/13 04:10 | Frederik Nielsen v Wishaya Trongcharoenchaikul | 6-7,6-4,6-0 |
| Challenger Seoul Qual | 2018/04/28 04:30 | Yong-Kyu Lim v Frederik Nielsen | 6-4,6-1 |
| Davis Cup | 2018/04/07 10:00 | Frederik Nielsen v Karim-Mohamed Maamoun | 6-3,3-6,6-7 |
| ITF Uzbekistan F4 | 2018/06/05 04:00 | Daniil Zarichanskiy v Sergey Betov | 4-6,2-6 |
| ITF Uzbekistan F3 | 2018/05/30 08:00 | Sergey Betov v Daniil Zarichanskiy | 6-1,6-1 |
| ITF Uzbekistan F3 | 2018/05/29 06:30 | Amal Sultanbekov v Daniil Zarichanskiy | 4-6,0-6 |
| ITF Ukraine F3 | 2018/05/22 07:00 | Daniil Zarichanskiy v Dmitry Myagkov | 2-6,2-6 |
| ITF Bulgaria F1 | 2018/05/16 08:20 | Markos Kalovelonis v Daniil Zarichanskiy | 6-1,6-3 |
| ITF Egypt F17 | 2018/05/08 07:30 | Niels Lootsma v Daniil Zarichanskiy | 6-4,6-1 |
| ITF Egypt F16 | 2018/05/02 13:45 | Manfred Fellin v Daniil Zarichanskiy | 6-2,6-0 |
| ITF Egypt F15 | 2018/04/24 08:00 | Daniil Zarichanskiy v Duje Kekez | 6-7,1-6 |