Stadium: Buenos Aires Lawn Tennis Club
| US Open, New York, USA | 2021/09/01 18:50 | Frances Tiafoe v Pella, Guido | 6-1,6-2,7-5 |
| US Open, New York, USA | 2021/08/30 23:40 | Pella, Guido v Filip Krajinovic | 6-7,6-3,6-2,6-2 |
| Winston-Salem, USA | 2021/08/23 19:00 | Jordan Thompson v Pella, Guido | 6-1,1-6,6-3 |
| Cincinnati, USA | 2021/08/19 19:25 | Pella, Guido v Alexander Zverev | 2-6,3-6 |
| Cincinnati, USA | 2021/08/18 15:40 | Pella, Guido v Fabio Fognini | 6-1,7-5 |
| Cincinnati, USA | 2021/08/16 00:00 | David Goffin v Pella, Guido | 3-6,3-6 |
| Wimbledon, London, Great Britain | 2021/06/30 10:00 | Matteo Berrettini v Pella, Guido | 6-4,3-6,6-4,6-0 |
| ATP Mallorca | 2021/06/21 11:30 | Stefano Travaglia v Pella, Guido | 7-5,7-6 |