Stadium: Court 1 Round: 26 Ground: Hardcourt indoor
| ITF - M25 Falun | 2021/09/27 12:00 | Michal Dembek v Yusuke Takahashi | 6-7,6-2,3-6 |
| Challenger - Columbus | 2021/09/19 14:00 | Gijs Brouwer v Yusuke Takahashi | 6-1,7-6 |
| ITF M25 - Decatur | 2021/08/05 15:00 | Yusuke Takahashi v Gijs Brouwer | 1-6,0-6 |
| ITF M25 - Decatur | 2021/08/04 16:25 | Rinky Hijikata v Yusuke Takahashi | 2-6,6-7 |
| ITF M25 Champaign | 2021/07/29 19:05 | Naoki Nakagawa v Yusuke Takahashi | 6-3,6-4 |
| ITF M25 Champaign | 2021/07/28 21:15 | Yusuke Takahashi v Sekou Bangoura | 7-5,6-3 |
| ITF - M25 Idanha-A-Nova | 2021/07/22 11:05 | Yusuke Takahashi v Alejandro Moro Canas | 6-4,6-7,2-6 |
| ITF - M25 Idanha-A-Nova | 2021/07/21 08:00 | Yusuke Takahashi v Ben Jones | 6-4,6-4 |
| ITF - M25 Falun | 2021/09/28 11:00 | Vladimir Ivanov v Khumoyun Sultanov | 1-6,6-7 |
| ITF M25 - Jönköping | 2021/09/23 08:00 | Evgeny Karlovskiy v Khumoyun Sultanov | 6-3,6-2 |
| ITF M25 - Jönköping | 2021/09/22 09:55 | Elmer Moller v Khumoyun Sultanov | 2-6,6-4,2-6 |
| ITF M25 - Jönköping | 2021/09/21 07:30 | Arvid Nordquist v Khumoyun Sultanov | 3-6,3-6 |
| Davis Cup | 2021/09/17 15:50 | Casper Ruud v Khumoyun Sultanov | 6-3,6-3 |
| Challenger - Nur-Sultan | 2021/07/19 09:05 | Jason Kubler v Khumoyun Sultanov | 6-3,7-5 |
| Challenger - Nur-Sultan | 2021/07/12 08:40 | Borna Gojo v Khumoyun Sultanov | 7-6,6-1 |
| Challenger - Almaty | 2021/06/14 04:00 | Jesper De Jong v Khumoyun Sultanov | 6-1,6-3 |