| ITF - M25 Martos | 06/19 11:00 | 25 | Sergi Perez Contri v Yannick Mertens | 2-6,2-6 | |
| ITF - M25 Jablonec Nad Nisou | 05/21 11:40 | 25 | [397] Sekou Bangoura v Yannick Mertens [435] | 6-4,6-0 | |
| Challenger - Aix en Provence | 05/06 15:00 | 24 | [252] Viktor Troicki v Yannick Mertens [431] | 6-3,6-1 | |
| Challenger - Bordeaux | 04/29 12:55 | 24 | [429] Yannick Mertens v Calvin Hemery [317] | 2-6,2-6 | |
| ITF - M25 Sunderland | 04/12 11:30 | 27 | [423] Igor Sijsling v Yannick Mertens [428] | 6-2,6-4 | |
| ITF - M25 Sunderland | 04/11 11:05 | 26 | [428] Yannick Mertens v Gijs Brouwer [415] | 7-5,6-2 | |
| ITF - M25 Sunderland | 04/09 11:35 | 25 | Alexis Canter v Yannick Mertens | 2-6,6-7 | |
| ITF M25 Bolton | 04/02 09:00 | 25 | [490] Evan Hoyt v Yannick Mertens [429] | 6-3,6-3 | |
| Challenger - St Brieuc | 03/25 09:00 | 166 | [127] Sergiy Stakhovsky v Yannick Mertens [441] | 6-3,6-4 | |
| Challenger - Lille | 03/20 15:50 | 25 | [120] Gregoire Barrere v Yannick Mertens [441] | 6-4,6-1 | |
| Challenger - Lille | 03/19 09:00 | 24 | [441] Yannick Mertens v Evan Furness [420] | 6-0,7-6 | |
| Challenger - Lille | 03/18 09:00 | 166 | [421] Andres A. Martinavarro v Yannick Mertens [454] | 4-6,4-6 | |
| Challenger Drummondville | 03/13 17:20 | 25 | [454] Yannick Mertens v Kaichi Uchida [282] | 5-7,6-4,4-6 | |
| Challenger Drummondville | 03/12 14:00 | 24 | [333] Matias Franco Descotte v Yannick Mertens [454] | 2-6,7-6,1-6 | |
| ITF - M25 Trento | 02/28 10:00 | 26 | [454] Yannick Mertens v Julian Lenz [395] | 3-6,4-6 | |
| ITF - M25 Trento | 02/27 11:00 | 25 | Yannick Mertens v Lorenzo Frigerio | 3-6,7-6,7-5 | |
| ITF M25 Glasgow | 02/19 10:00 | 25 | [451] Yannick Mertens v Tim Van Rijthoven [450] | 3-6,2-6 | |
| ITF - M15 Grenoble | 02/10 14:30 | 29 | Leny Mitjana v Yannick Mertens | 6-3,7-5 | |
| ITF - M15 Grenoble | 02/09 14:30 | 28 | Matteo Martineau v Yannick Mertens | 3-6,4-6 | |
| ITF - M15 Grenoble | 02/08 10:00 | 27 | Yanais Laurent v Yannick Mertens | 3-6,3-6 | |
| ITF - M15 Grenoble | 02/07 11:40 | 26 | Ugo Blanchet v Yannick Mertens | 6-3,4-6,4-6 | |
| ITF - M15 Grenoble | 02/06 10:00 | 25 | Arthur Bernabe v Yannick Mertens | 1-6,0-6 | |
| ITF - M15 Sharm El Sheikh | 01/31 09:45 | 26 | Yannick Mertens v Pablo V-Gonzalez | 2-6,6-4,2-6 | |
| ITF - M15 Sharm El Sheikh | 01/30 12:15 | 25 | [457] Yannick Mertens v Yu Hsiou Hsu [307] | 6-3,6-0 | |
| Challenger - Rennes | 01/24 15:35 | 26 | [111] Elias Ymer v Yannick Mertens [410] | 6-3,6-4 | |
| Challenger - Rennes | 01/23 17:05 | 25 | [269] Evgeny Karlovskiy v Yannick Mertens [410] | 3-6,6-7 | |
| Challenger - Rennes | 01/21 09:00 | 166 | [455] Gregoire Jacq v Yannick Mertens [410] | 7-5,6-2 | |
| ITF - M15 Bressuire | 01/18 13:00 | 27 | Yannick Mertens v Leny Mitjana | 6-7,5-7 | |
| ITF - M15 Bressuire | 01/17 11:00 | 26 | [466] Christopher Heyman v Yannick Mertens [410] | 3-6,0-6 | |
| ITF - M15 Bressuire | 01/16 09:00 | 25 | Clement Tabur v Yannick Mertens | 2-6,3-6 |