Stadium: Court 1 Round: 25 Ground: Clay
| ITF Germany F12 | 2018/08/14 11:00 | Mertens, Nico v 빌라로, 알레조 | 4-6,3-6 |
| ITF Belgium F7 Qual | 2018/08/06 09:00 | Mertens, Nico v Damiens, Antoine | 6-7,4-6 |
| ITF Belgium F7 Qual | 2018/08/05 08:00 | Mertens, Nico v 레이바 비아손, 오스칼 마티아스 | 6-1,6-0 |
| ITF Germany F10 | 2018/08/01 14:05 | Mertens, Nico v 메나,파쿤도 | 2-6,2-6 |
| ITF Germany F10 Qual | 2018/07/30 12:00 | Mertens, Nico v Nery Junior, Osni | 4-6,5-7 |
| ITF Germany F10 Qual | 2018/07/29 15:30 | Mertens, Nico v Koch, Niklas | 6-4,7-6 |
| ITF Germany F9 | 2018/07/24 10:00 | Mertens, Nico v 구이날드, 마누엘 | 0-6,6-4,4-6 |
| ITF Bosnia and Herzegovina F3 | 2018/05/29 10:40 | Mertens, Nico v 파티크, 네르만 | 4-6,3-6 |
| Meerbusch, Germany, Qualifying | 2018/08/11 14:35 | 쿤, 니콜라 v Merckx, Jonas | 7-5,6-4 |
| ITF Germany F10 | 2018/07/31 14:55 | 반 데 잔드슐프, 보티크 v Merckx, Jonas | 6-1,6-2 |
| ITF Belgium F5 | 2018/07/27 12:00 | 베르그스, 지조우 v Merckx, Jonas | 6-2,6-4 |
| ITF Belgium F5 | 2018/07/26 09:00 | Merckx, Jonas v Gerritsen, Stephan | 6-2,6-0 |
| ITF Belgium F5 | 2018/07/25 12:10 | Merckx, Jonas v Fetisleam, Edris | 6-2,5-7,6-3 |
| ITF Belgium F5 | 2018/07/24 08:00 | Merckx, Jonas v 사켈라리디스, 미칼리스 | 6-3,6-1 |
| ITF Belgium F4 | 2018/07/21 12:30 | Merckx, Jonas v 브로세트, 사무엘 | 4-6,5-7 |
| ITF Belgium F4 | 2018/07/20 10:00 | Merckx, Jonas v 에게아, 프란코 에마누엘 | 4-6,6-4,6-0 |