Stadium: Center Round: 45 Ground: Hardcourt outdoor
| Challenger Tashkent | 2018/10/08 12:40 | Khumoyun Sultanov v Akira Santillan | 6-7,4-6 |
| Challenger Almaty 2 | 2018/10/02 04:00 | Mohamed Safwat v Khumoyun Sultanov | 6-2,4-6,7-6 |
| Challenger Almaty 2 | 2018/10/01 04:00 | Rubin Statham v Khumoyun Sultanov | 4-6,6-7 |
| Challenger Almaty 2 | 2018/09/30 06:55 | Roman Khassanov v Khumoyun Sultanov | 1-6,0-6 |
| Challenger Almaty 2 | 2018/09/29 09:20 | Khumoyun Sultanov v Tobias Simon | 7-6,6-4 |
| Challenger - Astana | 2018/07/19 06:30 | Khumoyun Sultanov v Sebastian Ofner | 3-6,3-6 |
| Challenger - Astana | 2018/07/17 05:30 | Farrukh Dustov v Khumoyun Sultanov | 4-6,2-6 |
| Challenger Astana Qual | 2018/07/15 04:30 | Arjun Kadhe v Khumoyun Sultanov | 1-6,6-3,2-6 |