Stadium: CENTRALA Round: 25 Ground: Clay
| Challenger - Szczecin | 2021/09/13 11:00 | Stefano Travaglia v Sumit Nagal | 3-6,6-1,6-4 |
| Challenger - Banja Luka | 2021/09/08 11:20 | Carlos Gomez-Herrera v Sumit Nagal | 7-5,6-3 |
| Challenger - Banja Luka | 2021/09/07 08:00 | Nicolas Alvarez v Sumit Nagal | 1-6,2-6 |
| Challenger - Como | 2021/08/31 13:00 | Sumit Nagal v Andrey Kuznetsov | 4-6,6-7 |
| US Open | 2021/08/24 16:30 | Sumit Nagal v Juan Pablo Ficovich | 5-7,6-4,3-6 |
| Challenger - Meerbusch | 2021/08/09 11:05 | Tomas Barrios Vera v Sumit Nagal | 7-5,4-6,6-3 |
| Challenger - Liberec | 2021/08/02 15:30 | Maximilian Marterer v Sumit Nagal | 6-4,6-3 |
| Jocurile Olimpice 2020 - Masculin | 2021/07/26 05:00 | Sumit Nagal v Daniil Medvedev | 2-6,1-6 |
| Challenger - Istanbul | 2021/09/14 11:40 | James Duckworth v Lorenzo Giustino | 7-5,6-1 |
| Challenger - Sevilia | 2021/09/06 17:00 | Lorenzo Giustino v Flavio Cobolli | 0-6,2-6 |
| US Open | 2021/08/25 19:40 | Lorenzo Giustino v Aleksandar Kovacevic | 6-3,6-7,1-6 |
| Challenger - Verona | 2021/08/17 13:20 | Riccardo Bonadio v Lorenzo Giustino | 4-6,6-4,6-4 |
| Challenger - Praga | 2021/08/11 10:00 | Lorenzo Giustino v Evan Furness | 6-7,6-4,3-6 |
| Challenger - Praga | 2021/08/10 08:00 | Lorenzo Giustino v Evgeny Karlovskiy | 7-6,6-2 |
| Challenger - Cordenons | 2021/08/04 13:00 | Francisco Cerundolo v Lorenzo Giustino | 6-3,6-3 |
| Challenger - Cordenons | 2021/08/02 13:50 | Lorenzo Giustino v Filippo Baldi | 6-7,6-4,6-2 |