Stadium: Court 5 Round: 27 Ground: Hardcourt indoor
| 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 Sunderland | 2019/04/11 13:25 | Igor Sijsling v William Griffith | 6-4,6-2 |
| ITF M25 Sunderland | 2019/04/09 13:25 | Liam Broady v Igor Sijsling | 6-2,2-6,1-6 |
| ITF M25 Bolton | 2019/04/07 09:30 | Botic Van De Zandschulp v Igor Sijsling | 7-6,6-7,7-5 |
| ITF M25 Bolton | 2019/04/06 09:00 | Igor Sijsling v Lloyd Glasspool | 6-2,6-0 |
| ITF M25 Bolton | 2019/04/05 11:30 | Evan Hoyt v Igor Sijsling | 2-6,2-6 |
| ITF M25 Bolton | 2019/04/04 12:05 | Ronan Joncour v Igor Sijsling | 1-6,2-6 |
| ITF M25 Bolton | 2019/04/02 12:30 | Igor Sijsling v Viktor Durasovic | 6-1,6-2 |
| ITF M15 Sharm El Sheikh | 2019/03/31 08:00 | Igor Sijsling v Gilbert S K Junior | 6-2,3-6,6-1 |
| ITF M25 Sunderland | 2019/04/11 11:05 | Yannick Mertens v Gijs Brouwer | 7-5,6-2 |
| ITF M25 Sunderland | 2019/04/09 11:35 | Alexis Canter v Yannick Mertens | 2-6,6-7 |
| ITF M25 Bolton | 2019/04/02 09:00 | Evan Hoyt v Yannick Mertens | 6-3,6-3 |
| Challenger St Brieuc | 2019/03/25 09:00 | Sergiy Stakhovsky v Yannick Mertens | 6-3,6-4 |
| Challenger Lille | 2019/03/20 15:50 | Gregoire Barrere v Yannick Mertens | 6-4,6-1 |
| Challenger Lille | 2019/03/19 09:00 | Yannick Mertens v Evan Furness | 6-0,7-6 |
| Challenger Lille | 2019/03/18 09:00 | Andres Artunedo Martinavarr v Yannick Mertens | 4-6,4-6 |
| Challenger Drummondville | 2019/03/13 17:20 | Yannick Mertens v Kaichi Uchida | 5-7,6-4,4-6 |