Stadium: Court 9 Round: 25 Ground: Hardcourt outdoor
| ITF M15 St Petersburg | 2021/04/16 09:30 | Yanki Erel v Sarp Agabigun | 6-4,6-1 |
| ITF M15 St Petersburg | 2021/04/15 10:25 | Sarp Agabigun v Konstantin Kravchuk | 5-7,6-2,6-3 |
| ITF M15 St Petersburg | 2021/04/13 09:00 | Timur Kiyamov v Sarp Agabigun | 6-7,4-6 |
| ITF M15 St Petersburg | 2021/04/12 07:00 | Sarp Agabigun v Dominik Recek | 6-4,6-2 |
| ITF M15 St Petersburg Qual | 2021/04/11 09:20 | Sarp Agabigun v Mert Alkaya | 6-4,6-3 |
| ITF M15 St Petersburg | 2021/04/09 08:00 | Ivan Nedelko v Sarp Agabigun | 6-1,6-4 |
| ITF M15 St Petersburg | 2021/04/08 10:45 | Sarp Agabigun v Alexey Zakharov | 6-2,6-4 |
| ITF M15 St Petersburg | 2021/04/07 11:15 | Sarp Agabigun v Aleksei Abazov | 6-0,6-0 |
| Challenger Rome | 2021/04/20 08:00 | Flavio Cobolli v Hugo Grenier | 6-1,4-6,6-2 |
| Challenger Rome | 2021/04/18 09:20 | Matteo Gigante v Hugo Grenier | 6-2,2-6,3-6 |
| Challenger Oeiras | 2021/04/07 11:05 | Manuel Guinard v Hugo Grenier | 6-4,6-1 |
| Challenger Oeiras | 2021/04/06 09:00 | Hugo Grenier v Duckhee Lee | 6-0,6-3 |
| Challenger Lugano | 2021/03/26 12:20 | Hugo Grenier v Altug Celikbilek | 6-4,4-6,3-6 |
| Challenger Lugano | 2021/03/24 15:20 | Hugo Grenier v Bernard Tomic | 6-4,4-6,7-5 |
| Challenger Lugano | 2021/03/22 15:00 | Roberto Marcora v Hugo Grenier | 4-6,6-7 |
| Challenger Biella | 2021/03/09 09:00 | Hugo Grenier v Tristan Lamasine | 4-6,2-6 |