Stadium: Ct 9 Round: 25 Ground: Hardcourt outdoor
| Antwerp, Belgium | 2018/10/14 12:50 | Granollers, Marcel v Mertens, Yannick | 6-4,6-4 |
| ITF Portugal F18 | 2018/09/30 10:00 | Gleb Sakharov v Mertens, Yannick | 7-6,6-4 |
| ITF Portugal F18 | 2018/09/29 12:25 | Cacao, Tiago v Mertens, Yannick | 4-6,1-6 |
| ITF Portugal F18 | 2018/09/28 14:00 | Marek Gengel v Mertens, Yannick | 6-2,6-7,1-6 |
| ITF Portugal F18 | 2018/09/27 09:00 | Pedro Araujo v Mertens, Yannick | 2-6,3-6 |
| ITF Portugal F18 | 2018/09/26 10:20 | Dischinger, Eduardo v Mertens, Yannick | 0-6,6-7 |
| ITF France F18 | 2018/09/23 13:00 | Antoine Cornut-Chauvinc v Mertens, Yannick | 6-7,2-6 |
| ITF France F18 | 2018/09/22 13:50 | Antoine Escoffier v Mertens, Yannick | 6-7,6-3,6-7 |
| ITF Australia F8 | 2018/10/09 01:50 | Romios, Matthew Christopher v Bourchier, Harry | 7-5,3-6,6-2 |
| ITF Australia F8 | 2018/10/08 02:30 | Bourchier, Harry v Letcher, Clinton | 6-4,6-1 |
| ITF Australia F8 | 2018/10/06 04:00 | Bourchier, Harry v Holt-Crossman, Erik | 6-2,6-2 |
| Challenger Stockton | 2018/09/30 22:50 | Bourchier, Harry v Patrick Kypson | 3-6,5-7 |
| ITF USA F25 | 2018/09/17 18:00 | Bourchier, Harry v Ignat, Dragos Constantin | 3-6,6-3,3-6 |
| ITF USA F25 | 2018/09/16 17:30 | Bourchier, Harry v Gupta, Aditya | 6-1,6-1 |
| ITF USA F25 | 2018/09/15 17:30 | Bourchier, Harry v Hain, Jan Soeren | 6-1,6-3 |
| Challenger Shanghai Qual | 2018/09/09 04:30 | Bourchier, Harry v Kelly, Dayne | 3-6,2-6 |