Stadium: Court 2 Round: 19 Ground: Hardcourt outdoor
| ITF M25 Prague | 2021/10/08 09:00 | Khumoyun Sultanov v Marek Gengel | 3-6,6-3,6-4 |
| Challenger Manama | 2021/11/21 11:45 | Khumoyun Sultanov v Ahmed, Omar | 6-3,6-2 |
| ITF M25 Nur-Sultan | 2021/10/29 05:00 | Sabanin, Yan v Khumoyun Sultanov | 6-3,6-4 |
| ITF M25 Nur-Sultan | 2021/10/28 04:55 | Sergey Fomin v Khumoyun Sultanov | 6-7,0-6 |
| ITF M25 Nur-Sultan | 2021/10/27 07:35 | Tashbulatov, Dostanbek v Khumoyun Sultanov | 3-6,3-6 |
| ITF M25 Nur-Sultan | 2021/10/20 05:10 | Khumoyun Sultanov v Eric Vanshelboim | 4-6,3-6 |
| ITF M25 Prague | 2021/10/10 08:25 | Khumoyun Sultanov v David Poljak | 6-2,3-6,6-4 |
| ITF M25 Prague | 2021/10/09 08:25 | Timo Stodder v Khumoyun Sultanov | 6-4,3-6,5-7 |
| ITF M25 Prague | 2021/10/08 09:00 | Khumoyun Sultanov v Marek Gengel | 3-6,6-3,6-4 |
| Challenger Manama | 2021/11/21 12:00 | Arjun Kadhe v Marek Gengel | 6-4,4-6,3-6 |
| ITF - M15 Sharm El Sheikh | 2021/11/14 10:15 | Cloes, Loic v Marek Gengel | 0-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2021/11/14 07:00 | Marek Gengel v Daniel Little | 7-5,6-4 |
| ITF - M15 Sharm El Sheikh | 2021/11/12 08:00 | Sergei Pogosian v Marek Gengel | 2-6,1-6 |
| ITF - M15 Sharm El Sheikh | 2021/11/11 09:30 | Kelsey Stevenson v Marek Gengel | 3-6,3-6 |
| ITF - M15 Sharm El Sheikh | 2021/11/10 12:00 | Erik Arutiunian v Marek Gengel | 1-6,1-6 |
| ITF - M15 Sharm El Sheikh | 2021/11/07 08:00 | Marek Gengel v Capecchi, Daniele | 6-7,6-2,6-3 |
| ITF - M15 Sharm El Sheikh | 2021/11/06 08:00 | Marek Gengel v Illya Beloborodko | 6-1,4-6,6-2 |