Stadium: Court 16 Round: 25 Ground: Hardcourt indoor
| ITF M15 Faro | 2020/03/05 12:00 | Mertens, Yannick v Alberto Barroso Campos | 7-6,6-7,2-6 |
| ITF M15 Faro | 2020/03/04 10:00 | Mertens, Yannick v Dembek, Michal | 6-2,7-5 |
| ITF - M25 Sunderland | 2020/02/27 10:00 | Mertens, Yannick v Dan Added | 3-6,7-6,6-7 |
| ITF - M25 Sunderland | 2020/02/25 09:55 | Mertens, Yannick v Patten, Henry | 7-6,4-6,6-4 |
| Challenger - Koblenz | 2020/02/17 16:05 | Mirza Basic v Mertens, Yannick | 6-3,6-1 |
| ITF - M15 Grenoble | 2020/02/12 11:45 | Mertens, Yannick v Titouan Droguet | 7-6,4-6,4-6 |
| ITF - M15 Veigy-Foncenex | 2020/01/28 13:55 | Alexis Gautier v Mertens, Yannick | 6-2,7-6 |
| ITF - M15 Bressuire | 2020/01/23 12:10 | Mertens, Yannick v Anton Matusevich | 7-6,6-7,5-7 |
| ITF M25 Plaisir | 2020/09/14 13:00 | Barrientos, Nicolas v Louis Dussin | 1-6,1-6 |
| ITF M25 Plaisir | 2020/09/14 08:00 | Barrientos, Nicolas v Bron, Hugo | 6-4,6-4 |
| ITF M25 Plaisir | 2020/09/13 12:05 | Barrientos, Nicolas v Antoine Ghibaudo | 6-1,6-1 |
| Las Vegas, Singles M-ITF-USA-07A | 2020/03/05 19:25 | Barrientos, Nicolas v Alex Rybakov | 1-6,6-4,4-6 |
| Las Vegas, Singles M-ITF-USA-07A | 2020/03/04 20:50 | Barrientos, Nicolas v Braswell, Micah | 6-0,6-1 |
| Challenger - Morelos | 2020/02/17 16:00 | Roelofse, Ruan v Barrientos, Nicolas | 6-3,2-6,6-3 |
| ITF - M25 Naples | 2020/02/11 15:00 | Gomez, Alejandro v Barrientos, Nicolas | 6-1,2-6,10-7 |
| ITF - M25 Naples | 2020/02/10 15:30 | A.J Catanzariti v Barrientos, Nicolas | 2-6,2-6 |