| Singles | |
|---|---|
| 2021 Nur-Sultan Challenger | |
| Champion |  Mackenzie McDonald |
| Runner-up |  Jurij Rodionov |
| Score | 6–1, 6–2 |
There was no defending champion as the last edition of the tournament was canceled due to the COVID-19 pandemic. [1]
Mackenzie McDonald won the title after defeating Jurij Rodionov 6–1, 6–2 in the final.
Mikhail Kukushkin (first round)
Evgeny Donskoy (first round)
Cedrik-Marcel Stebe (withdrew)
Prajnesh Gunneswaran (semifinals)
Henri Laaksonen (semifinals) Jurij Rodionov (final)
Martin Kližan (quarterfinals)
Blaž Rola (first round)| Semifinals | Final | ||||||||||||
| Mackenzie McDonald | 6 | 6 | |||||||||||
| 5 | Henri Laaksonen | 2 | 1 | ||||||||||
| Mackenzie McDonald | 6 | 6 | |||||||||||
| 6 | Jurij Rodionov | 1 | 2 | ||||||||||
| 4 | Prajnesh Gunneswaran | 2 | 6 | 3 | |||||||||
| 6 | Jurij Rodionov | 6 | 3 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Kukushkin | 5 | 5 | ||||||||||||||||||||||||
| M McDonald | 7 | 7 | M McDonald | 6 | 6 | ||||||||||||||||||||||
 D Istomin | 66 | 6 | 6 | D Istomin | 2 | 3 | |||||||||||||||||||||
| WC | D Yevseyev | 78 | 3 | 3 | M McDonald | 6 | 3 | 77 | |||||||||||||||||||
 F Ferreira Silva | 6 | 6 | F Ferreira Silva | 4 | 6 | 63 | |||||||||||||||||||||
| S Ofner | 3 | 4 | F Ferreira Silva | 6 | 3 | 6 | |||||||||||||||||||||
| Q | P Kotov | 6 | 79 | Q | P Kotov | 1 | 6 | 4 | |||||||||||||||||||
| 8 | B Rola | 4 | 67 | M McDonald | 6 | 6 | |||||||||||||||||||||
| Q | B Bobrov | 2 | 1 | 5 | H Laaksonen | 2 | 1 | ||||||||||||||||||||
 K Żuk | 6 | 6 | K Żuk | 6 | 4 | ||||||||||||||||||||||
| Alt |  T-l Wu | 6 | 7 | Alt | T-l Wu | 3 | 2r | ||||||||||||||||||||
 H Grenier | 4 | 5 | K Żuk | 4 | 3 | ||||||||||||||||||||||
| Q |  R Peniston | 3 | 6 | 4 | 5 | H Laaksonen | 6 | 6 | |||||||||||||||||||
 B Gojo | 6 | 1 | 6 | B Gojo | 6 | 5 | 2 | ||||||||||||||||||||
| LL |  R Quiroz | 4 | 2 | 5 | H Laaksonen | 1 | 7 | 6 | |||||||||||||||||||
| 5 | H Laaksonen | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | M Kližan | 6 | 4 | 77 | |||||||||||||||||||||||
| WC | T Skatov | 4 | 6 | 65 | 7 | M Kližan | 67 | 6 | 77 | ||||||||||||||||||
| D Popko | 4 | 6 | 67 | Alt | U Blanch | 79 | 2 | 65 | |||||||||||||||||||
| Alt | U Blanch | 6 | 2 | 79 | 7 | M Kližan | 3 | 6 | 4 | ||||||||||||||||||
| A Müller | 68 | 6 | 1 | 4 | P Gunneswaran | 6 | 4 | 6 | |||||||||||||||||||
 B Schnur | 710 | 3 | 6 | B Schnur | 6 | 3 | 0 | ||||||||||||||||||||
| WC | Dostanbek Tashbulatov | 2 | 3 | 4 | P Gunneswaran | 3 | 6 | 6 | |||||||||||||||||||
| 4 | P Gunneswaran | 6 | 6 | 4 | P Gunneswaran | 2 | 6 | 3 | |||||||||||||||||||
| 6 | J Rodionov | 6 | 6 | 6 | J Rodionov | 6 | 3 | 6 | |||||||||||||||||||
| LL | I Nedelko | 3 | 3 | 6 | J Rodionov | 6 | 6 | ||||||||||||||||||||
 T Ito | 6 | 6 | T Ito | 3 | 2 | ||||||||||||||||||||||
| Q |  V Manafov | 4 | 4 | 6 | J Rodionov | 6 | 6 | ||||||||||||||||||||
| P Polansky | 3 | 4 |  T Macháč | 2 | 3 | ||||||||||||||||||||||
| M Marterer | 6 | 6 | M Marterer | 4 | 6 | 3 | |||||||||||||||||||||
| T Macháč | 6 | 3 | 6 | T Macháč | 6 | 3 | 6 | ||||||||||||||||||||
| 2 | E Donskoy | 3 | 6 | 1 | |||||||||||||||||||||||
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