Round: 44 Ground: Clay
| Challenger Astana Qual | 2018/07/14 06:50 | Pavel Kotov v Narbekov, Sultan | 6-1,6-3 |
| ITF Kazakhstan F5 Qual | 2018/04/23 05:00 | Dubinsky, Vladislav v Narbekov, Sultan | 6-1,6-0 |
| ITF Kazakhstan F4 Qual | 2018/04/15 09:00 | Narbekov, Sultan v Imanol L Morillo | 3-6,4-6 |
| ITF Kazakhstan F4 Qual | 2018/04/14 10:10 | Prudnikau, Aliaksandr v Narbekov, Sultan | 6-7,3-6 |
| ITF Kazakhstan F3 Qual | 2018/04/08 07:30 | Terzyan, Rafik v Narbekov, Sultan | 7-5,6-0 |
| ITF Kazakhstan F2 Qual | 2018/02/17 04:00 | Narbekov, Sultan v Yulik, Viacheslav | 1-6,6-7 |
| Challenger Almaty Qual | 2017/09/30 05:30 | Narbekov, Sultan v Molchanov, Denys | 4-6,4-6 |
| ITF Kazakhstan F7 Qual | 2017/09/25 04:00 | Tsivadze, George v Narbekov, Sultan | 7-5,6-3 |