Stadium: Court 1 Round: 26 Ground: Clay
| Tunisia F16, Singles Qualifying | 2018/04/25 10:45 | Mertens, Yannick v Butts, Skyler | 6-1,6-2 |
| ITF USA F10 | 2018/04/11 17:10 | Mertens, Yannick v Redlicki, Michael | 3-6,3-6 |
| ITF USA F9 | 2018/04/05 15:00 | Karue Sell v Mertens, Yannick | 6-3,4-6,7-5 |
| ITF USA F9 | 2018/04/03 15:40 | Ram-Harel, Or v Mertens, Yannick | 4-6,6-3,1-6 |
| Challenger Le Gosier | 2018/03/27 20:55 | Mertens, Yannick v Bemelmans, Ruben | 5-7,1-6 |
| Challenger - Lille | 2018/03/20 18:05 | Olaso, Guillermo v Mertens, Yannick | 5-7,6-1,6-3 |
| ITF Israel F1 | 2018/03/08 08:00 | Mertens, Yannick v Gianluca Mager | 7-5,6-3 |
| ITF Israel F1 | 2018/03/07 09:40 | Mertens, Yannick v Ferrando, Nicolas | 6-2,6-2 |
| Tunisia F16, Singles Qualifying | 2018/04/24 09:00 | Chien, Christopher v Bothwell, Peter | 0-6,0-6 |
| Tunisia F15, Singles Qualifying | 2018/04/19 09:00 | Brands, Daniel v Bothwell, Peter | 6-3,6-0 |
| Tunisia F15, Singles Qualifying | 2018/04/18 09:00 | Bothwell, Peter v Jandric, Darko | 1-6,6-3,6-1 |
| Coupe Davis | 2018/04/08 09:10 | Casper Ruud v Bothwell, Peter | 6-3,7-5 |
| Coupe Davis | 2018/04/07 10:00 | Viktor Durasovic v Bothwell, Peter | 6-3,2-6,3-6 |
| Portugal F4, Singles Qualifying | 2018/03/18 12:10 | Bothwell, Peter v Alejandro Davidovich Fokina | 4-6,4-6 |
| Portugal F4, Singles Qualifying | 2018/03/16 11:00 | Bothwell, Peter v Boyer, Dusty H | 5-7,7-6,6-3 |
| Portugal F4, Singles Qualifying | 2018/03/14 11:20 | Bothwell, Peter v Niesten, Miliaan | 6-4,6-2 |