Stadium: Court 5 Round: 26 Ground: Hardcourt outdoor
| ITF - Monastir M15 | 2021/05/19 11:20 | Khumoyun Sultanov v Robert Strombachs | 6-4,6-3 |
| Challenger St. Petersburg | 2021/03/08 07:00 | Khumoyun Sultanov v Tim Van Rijthoven | 2-6,1-6 |
| Challenger St. Petersburg - Kwalifikacje | 2021/03/07 09:35 | Khumoyun Sultanov v Daniil Glinka | 7-6,6-4 |
| Challenger St. Petersburg | 2021/03/01 13:25 | Altug Celikbilek v Khumoyun Sultanov | 6-4,6-1 |
| ITF - Antalya M15 | 2021/02/12 10:30 | Khumoyun Sultanov v Filip Cristian Jianu | 2-6,1-6 |
| ITF - Antalya M15 | 2021/02/11 09:20 | Khumoyun Sultanov v Alvaro Lopez San Martin | 6-2,6-3 |
| ITF - Antalya M15 | 2021/02/10 07:00 | Khumoyun Sultanov v Gabriele Maria Noce | 6-7,6-3,7-6 |
| ITF - Antalya M15 | 2021/02/05 07:00 | Khumoyun Sultanov v Hamad Medjedovic | 5-7,6-4,2-6 |
| ITF - Monastir M15 | 2021/05/18 12:35 | Mariano Kestelboim v Guy Orly Iradukunda | 1-6,4-6 |
| ITF - Monastir M15 | 2021/05/10 13:30 | Guy Orly Iradukunda v Mattia Frinzi | 6-4,4-6,4-10 |
| ITF - Monastir M15 | 2021/05/10 09:00 | Guy Orly Iradukunda v Fausto Tabacco | 3-6,6-2,12-10 |
| ITF - Monastir M15 | 2021/05/09 10:00 | Guy Orly Iradukunda v Daiki Yoshimura | 2-6,2-6 |
| ITF - Monastir M15 | 2021/04/21 12:35 | Guy Orly Iradukunda v Igor Marcondes | 6-4,2-6,3-6 |
| ITF - Monastir M15 | 2021/04/20 08:00 | Guy Orly Iradukunda v Berk Ilkel | 6-4,6-2 |
| ITF - Monastir M15 | 2021/04/19 12:00 | Guy Orly Iradukunda v Miguel Fernando Pereira | 7-6,7-5 |
| ITF - Monastir M15 | 2021/04/18 09:00 | Guy Orly Iradukunda v Thomas George Brun | 6-1,6-1 |