Stadium: Court 4 Round: 14 Ground: Hardcourt indoor
| Challenger Zagreb | 2021/05/11 10:00 | Sebastian Baez v Ramkumar Ramanathan | 6-4,6-0 |
| Challenger Zagreb | 2021/05/10 08:30 | Zhizhen Zhang v Ramkumar Ramanathan | 3-6,6-7 |
| Challenger Zagreb | 2021/05/09 08:30 | Frane Nincevic v Ramkumar Ramanathan | 4-6,3-6 |
| ATP Dubai | 2021/03/14 08:30 | Ramkumar Ramanathan v Yuki Bhambri | 5-7,7-5,2-6 |
| ATP Dubai | 2021/03/13 07:00 | Evgeny Donskoy v Ramkumar Ramanathan | 4-6,4-6 |
| ATP Doha | 2021/03/08 12:50 | Ramkumar Ramanathan v Alexander Bublik | 4-6,2-6 |
| ATP Doha | 2021/03/07 12:30 | Norbert Gombos v Ramkumar Ramanathan | 3-6,1-6 |
| ATP Doha | 2021/03/06 09:00 | Frederik Nielsen v Ramkumar Ramanathan | 4-6,1-6 |
| UK Pro League | 2021/04/11 13:30 | Anton Matusevich v Henry Patten | 7-5,6-1 |
| UK Pro League | 2021/04/10 16:00 | Anton Matusevich v George Houghton | 7-5,7-5 |
| UK Pro League | 2021/04/09 11:30 | Anton Matusevich v Lui Maxted | 6-4,6-4 |
| UK Pro League | 2021/04/08 09:00 | Anton Matusevich v Tom Hands | 6-0,6-3 |
| UK Pro League | 2021/04/07 09:00 | Anton Matusevich v Joshua Paris | 6-2,6-1 |
| UK Pro League | 2021/04/06 11:35 | Anton Matusevich v Oscar Weightman | 6-4,6-0 |
| UK Pro League | 2021/04/05 09:00 | Anton Matusevich v Henry Patten | 6-2,6-3 |
| UK Pro League | 2021/03/21 16:00 | Anton Matusevich v Mark Whitehouse | 6-2,6-7,10-6 |