Stadium: Court 8 Round: 25 Ground: Hardcourt indoor
| Challenger Recanati Qual | 2018/07/01 08:00 | Frigerio, Lorenzo v Mertens, Yannick | 4-6,4-6 |
| ITF M25 Glasgow | 2019/02/19 10:00 | Mertens, Yannick v van Rijthoven, Tim | 3-6,2-6 |
| ITF - M15 Grenoble | 2019/02/10 14:30 | Mitjana, Leny v Mertens, Yannick | 6-3,7-5 |
| ITF - M15 Grenoble | 2019/02/09 14:30 | Matteo Martineau v Mertens, Yannick | 3-6,4-6 |
| ITF - M15 Grenoble | 2019/02/08 10:00 | Yanais Laurent v Mertens, Yannick | 3-6,3-6 |
| ITF - M15 Grenoble | 2019/02/07 11:40 | Ugo Blanchet v Mertens, Yannick | 6-3,4-6,4-6 |
| ITF - M15 Grenoble | 2019/02/06 10:00 | Bernabe, Arthur v Mertens, Yannick | 1-6,0-6 |
| ITF - M15 Sharm El Sheikh | 2019/01/31 09:45 | Mertens, Yannick v Vivero Gonzalez, Pablo | 2-6,6-4,2-6 |
| ITF - M15 Sharm El Sheikh | 2019/01/30 12:15 | Mertens, Yannick v Yu Hsiou Hsu | 6-3,6-0 |
| ITF - M25 Trente | 2019/02/25 16:15 | Frigerio, Lorenzo v Davide Ferrarolli | 6-0,6-1 |
| ITF - M25 Trente | 2019/02/25 09:00 | Frigerio, Lorenzo v Hendrik Jebens | 7-5,6-3 |
| ITF M25 Oberentfelden | 2019/02/05 18:45 | Frigerio, Lorenzo v Ehrat, Sandro | 3-6,4-6 |
| ITF - M25 Nussloch | 2019/01/24 12:30 | Frigerio, Lorenzo v Botic Van De Zandschulp | 2-6,3-6 |
| ITF - M15 Bressuire | 2019/01/18 11:00 | Frigerio, Lorenzo v Matteo Martineau | 4-6,3-6 |
| ITF - M15 Bressuire | 2019/01/17 11:00 | Corentin Denolly v Frigerio, Lorenzo | 7-6,6-7,3-6 |
| ITF - M15 Bressuire | 2019/01/15 10:00 | Frigerio, Lorenzo v Botic Van De Zandschulp | 7-6,6-0 |
| ITF - M15 Bagnoles-de-l'Orne | 2019/01/10 09:00 | Frigerio, Lorenzo v Clement Tabur | 3-6,4-6 |