Stadium: COURT 6 Round: 27 Ground: Hardcourt outdoor
| ITF M15 New Delhi | 2021/03/31 09:40 | Marco Brugnerotto v Siddharth Vishwakarma | 6-4,5-7,6-4 |
| ITF M15 New Delhi | 2021/03/28 10:30 | Siddharth Vishwakarma v Jonathan Binding | 6-3,6-2 |
| ITF M15 New Delhi | 2021/03/28 05:00 | Anirudh Chandrasekar v Siddharth Vishwakarma | 7-5,3-6,9-11 |
| ITF M15 Indore | 2021/03/10 03:30 | Madhwin Kamath v Siddharth Vishwakarma | 2-6,6-4,6-4 |
| ITF M15 Indore | 2021/03/08 08:30 | Digvijay Pratap Singh v Siddharth Vishwakarma | 1-6,4-6 |
| ITF M15 Indore | 2021/03/08 05:05 | Yugal Bansal v Siddharth Vishwakarma | 1-6,1-6 |
| ITF M15 Indore | 2021/03/07 10:00 | Neeraj Yashpaul v Siddharth Vishwakarma | 6-7,4-6 |
| ITF M15 Lucknow | 2021/03/05 04:30 | Saketh Myneni v Siddharth Vishwakarma | 6-3,7-6 |
| ITF M15 Sharm El Sheikh | 2021/10/11 09:30 | Nitin Kumar Sinha v Alan Bojarski | 1-6,6-2,10-12 |
| ITF M15 Sharm El Sheikh | 2021/10/07 08:00 | Petr Hajek v Nitin Kumar Sinha | 6-3,6-7,6-4 |
| ITF M15 Sharm El Sheikh | 2021/10/06 09:35 | Nitin Kumar Sinha v Cezar Cretu | 4-6,6-1,6-2 |
| ITF M15 Sharm El Sheikh | 2021/10/05 08:00 | Nitin Kumar Sinha v Nico Jaeger | 6-4,6-0 |
| ITF M15 Sharm El Sheikh | 2021/10/04 08:00 | Nitin Kumar Sinha v Stephanos Schinas | 6-1,6-4 |
| ITF M15 Cairo | 2021/09/29 10:55 | Lorenzo Gagliardo v Nitin Kumar Sinha | 3-6,6-4,6-4 |
| ITF M15 Cairo | 2021/09/28 08:00 | Nitin Kumar Sinha v Roland Stuurman | 2-6,0-6 |
| ITF M15 Cairo | 2021/09/22 13:40 | Billy Harris v Nitin Kumar Sinha | 6-0,7-6 |