Estadio: Court 16 Round: 27 Ground: Hardcourt indoor
| 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 |
| ITF M25 Vogau | 2020/08/21 11:15 | Igor Sijsling v Manuel Guinard | 1-6,3-6 |
| ITF M25 Plaisir | 2020/09/17 10:20 | Valentin Royer v Guilherme Clezar | 7-6,6-7,4-6 |
| ITF M25 Plaisir | 2020/09/16 12:10 | Alexis Gautier v Guilherme Clezar | 4-6,4-6 |
| Challenger de Monterrey | 2020/03/05 20:30 | Guilherme Clezar v Kevin King | 6-7,6-4,4-6 |
| Challenger de Monterrey | 2020/03/04 17:00 | Federico Coria v Guilherme Clezar | 1-6,7-6,6-7 |
| Challenger de Monterrey | 2020/03/02 20:00 | Nicolas Mejia v Guilherme Clezar | 1-6,4-6 |
| Challenger de Columbus | 2020/02/27 18:45 | Guilherme Clezar v Denis Istomin | 3-6,1-6 |
| Challenger de Columbus | 2020/02/26 15:00 | Jason Kubler v Guilherme Clezar | 6-2,6-7,4-6 |
| Challenger de Columbus | 2020/02/25 15:00 | Justin Boulais v Guilherme Clezar | 4-6,2-6 |