Stadium: Court 4 Round: 25 Ground: Hardcourt indoor
| ITF M15 St Petersburg | 2021/04/05 11:00 | Daniil Glinka v Yannik Steinegger | 6-2,6-2 |
| ITF M15 St Petersburg | 2021/04/04 10:05 | Daniil Glinka v Stepan Pecak | 7-5,6-1 |
| Challenger St. Petersburg Qual | 2021/03/07 09:35 | Khumoyun Sultanov v Daniil Glinka | 7-6,6-4 |
| Challenger St. Petersburg | 2021/02/28 09:10 | Daniil Glinka v Skander Mansouri | 6-3,6-7,5-7 |
| ITF M15 St Petersburg Qual | 2021/02/07 12:45 | Daniil Glinka v Chad Kissell | 6-2,4-6,8-10 |
| ITF M15 St Petersburg | 2021/02/03 08:20 | Jan Choinski v Daniil Glinka | 6-1,6-4 |
| ITF M15 St Petersburg | 2021/02/01 07:00 | Daniil Glinka v Leonid Sheyngezikht | 6-3,6-4 |
| ITF M15 Parnu | 2020/11/05 08:00 | Daniil Glinka v Mick Veldheer | 6-7,6-7 |
| ITF M25 Biel | 2021/03/29 10:05 | Daniil Golubev v Maximilian Neuchrist | 1-6,0-6 |
| Challenger St. Petersburg Qual | 2021/03/07 11:20 | Daniil Golubev v Aleksandr Nedovyesov | 1-6,0-6 |
| Challenger St. Petersburg | 2021/02/28 12:15 | Ivan Nedelko v Daniil Golubev | 6-0,6-0 |
| ITF M15 St Petersburg | 2021/02/09 12:40 | Evgeny Tyurnev v Daniil Golubev | 6-1,6-1 |
| ITF M15 St Petersburg | 2021/02/02 11:30 | Karlis Ozolins v Daniil Golubev | 6-3,6-1 |
| ITF M15 Antalya | 2020/11/29 06:00 | Daniil Golubev v Martin Dimitrov | 1-6,0-6 |