Stadium: Court 15 Round: 28 Ground: Hardcourt indoor
| ITF M25 Sunderland | 2019/04/12 11:30 | Igor Sijsling v Yannick Mertens | 6-2,6-4 |
| Wimbledon Qual | 2016/06/24 11:40 | Igor Sijsling v Yannick Mertens | 6-3,6-2,7-6 |
| Challenger St Brieuc | 2016/03/30 14:00 | Igor Sijsling v Yannick Mertens | 6-3,6-2 |
| ITF M25 Plaisir | 2020/09/18 11:00 | Michael Geerts v Yannick Mertens | 6-7,0-6 |
| ITF M25 Plaisir | 2020/09/17 13:15 | Yannick Mertens v Pedro Sakamoto | 6-1,6-3 |
| ITF M25 Plaisir | 2020/09/16 12:00 | Yannick Mertens v Nicolas Barrientos | 1-6,6-2,6-3 |
| ITF M15 Faro | 2020/03/05 12:00 | Yannick Mertens v Alberto Barroso Campos | 7-6,6-7,2-6 |
| ITF M15 Faro | 2020/03/04 10:00 | Yannick Mertens v Michal Dembek | 6-2,7-5 |
| ITF M25 Sunderland | 2020/02/27 10:00 | Yannick Mertens v Dan Added | 3-6,7-6,6-7 |
| ITF M25 Sunderland | 2020/02/25 09:55 | Yannick Mertens v Henry Patten | 7-6,4-6,6-4 |
| Challenger Koblenz | 2020/02/17 16:05 | Mirza Basic v Yannick Mertens | 6-3,6-1 |
| ITF M25 Plaisir | 2020/09/18 11:00 | Igor Sijsling v Guilherme Clezar | 6-4,6-4 |
| ITF M25 Plaisir | 2020/09/17 10:55 | Igor Sijsling v Lucas Poullain | 6-2,6-7,6-2 |
| ITF M25 Plaisir | 2020/09/16 11:00 | Igor Sijsling v Boris Fassbender | 6-1,6-3 |
| ITF M15 Alkmaar | 2020/08/30 13:00 | Igor Sijsling v Jacopo Berrettini | 6-2,6-1 |
| ITF M15 Alkmaar | 2020/08/29 13:30 | Igor Sijsling v Jesper De Jong | 6-3,6-2 |
| ITF M15 Alkmaar | 2020/08/28 15:45 | Igor Sijsling v Shintaro Mochizuki | 6-1,6-1 |
| ITF M15 Alkmaar | 2020/08/27 15:50 | Igor Sijsling v Pol Martin Tiffon | 6-4,6-4 |
| ITF M15 Alkmaar | 2020/08/26 11:00 | Igor Sijsling v Sidane Pontjodikromo | 6-1,6-0 |