Stadium: Court 3 Round: 64 Ground: Grass
| French Open Qual | 2018/05/21 08:00 | Alexandre Muller v Donald Young | 7-6,6-3 |
| Challenger Savannah | 2018/05/01 21:35 | Cristian Garin v Donald Young | 6-3,4-6,6-1 |
| Challenger Sarasota | 2018/04/18 20:30 | Stefan Kozlov v Donald Young | 6-4,6-4 |
| Challenger Sarasota | 2018/04/16 15:45 | Federico Coria v Donald Young | 4-6,6-7 |
| ATP Houston | 2018/04/10 19:00 | Nicolas Kicker v Donald Young | 6-3,6-2 |
| ATP Miami | 2018/03/22 16:25 | Leonardo Mayer v Donald Young | 3-6,6-4,6-2 |
| ATP Indian Wells | 2018/03/08 21:25 | Borna Coric v Donald Young | 6-0,6-2 |
| ATP Acapulco | 2018/02/27 23:40 | Hyeon Chung v Donald Young | 7-6,6-1 |
| Challenger Loughborough Qual | 2018/05/19 14:40 | Andrea Vavassori v Miliaan Niesten | 3-6,6-1,6-0 |
| Challenger Heilbronn Qual | 2018/05/14 11:00 | Miliaan Niesten v Igor Sijsling | 3-6,2-6 |
| Challenger Heilbronn Qual | 2018/05/13 09:00 | Hernan Casanova v Miliaan Niesten | 1-6,5-7 |
| Challenger Heilbronn Qual | 2018/05/12 09:00 | Miliaan Niesten v Mathieu Meyer | 6-1,6-3 |
| ITF Spain F10 | 2018/04/24 08:00 | Miliaan Niesten v Alberto Romero De Avila Senise | 3-6,2-6 |
| ITF Portugal F8 | 2018/04/21 14:10 | Miliaan Niesten v Tiago Cacao | 4-6,5-7 |
| ITF Portugal F8 | 2018/04/20 10:00 | Miliaan Niesten v Sam Barry | 6-3,6-4 |
| ITF Portugal F8 | 2018/04/18 12:10 | Igor Sao Thiago v Miliaan Niesten | 1-6,3-6 |