Stadium: Court 2 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Idanha-A-Nova | 2021/07/18 10:30 | Egor Noskin v David Quayle | 6-4,6-4 |
| ITF M25 Idanha-A-Nova | 2021/07/11 08:00 | Yasha Zemel v David Quayle | 7-6,6-2 |
| ITF M15 Almada | 2021/07/04 12:00 | David Quayle v Aaron Cohen | 2-6,2-6 |
| ITF M15 Monastir | 2020/10/12 09:30 | Lilian Breut v David Quayle | 6-0,6-4 |
| ITF M15 Monastir | 2020/10/11 08:00 | Uladzislau Zhuk v David Quayle | 6-2,5-7,7-10 |
| ITF M15 Monastir | 2020/10/04 09:00 | David Quayle v Hugo Bron | 1-6,7-6,8-10 |
| ITF M15 Monastir | 2020/09/27 10:00 | Anthony Genov v David Quayle | 6-3,6-1 |
| ITF M25 Plaisir | 2020/09/14 09:25 | Clement Tabur v David Quayle | 6-4,7-5 |
| ITF M25 Idanha-A-Nova | 2021/07/18 13:00 | Mario G Fernandez v Guilherme Sousa Severin | 6-3,6-4 |
| ITF M25 Idanha-A-Nova | 2021/07/12 08:00 | Daniel Rodrigues v Guilherme Sousa Severin | 4-6,6-2,11-9 |
| ITF M15 Almada | 2021/07/04 09:30 | Goncalo Falcao v Guilherme Sousa Severin | 7-5,7-5 |
| ITF M15 Monastir | 2021/06/14 12:00 | Ajeet Rai v Guilherme Sousa Severin | 6-0,6-2 |
| ITF M15 Monastir | 2021/06/14 08:00 | Guilherme Sousa Severin v Kazuma Kawachi | 6-4,4-6,10-4 |
| ITF M15 Monastir | 2021/06/13 11:30 | Seth Seely v Guilherme Sousa Severin | 1-6,1-6 |
| ITF M15 Monastir | 2021/06/08 11:00 | Guilherme Sousa Severin v Thomas Fancutt | 6-2,4-6,4-6 |
| ITF M15 Quinta Do Lago | 2020/11/02 10:00 | Guilherme Sousa Severin v Terence Das | 1-6,0-6 |