2021 Nur-Sultan Challenger

The 2021 Nur-Sultan Challenger was a professional tennis tournament played on indoor hard courts. It was the third edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Nur-Sultan, Kazakhstan between 22 and 28 February 2021.

Seeds

 * 1 Rankings are as of 15 February 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇰🇿 Timofey Skatov
 * 🇰🇿 Dostanbek Tashbulatov
 * 🇰🇿 Denis Yevseyev

The following players received entry into the singles main draw as alternates:
 * 🇺🇸 Ulises Blanch
 * Wu Tung-lin

The following players received entry from the qualifying draw:
 * 🇷🇺 Bogdan Bobrov
 * 🇷🇺 Pavel Kotov
 * 🇺🇦 Vladyslav Manafov
 * 🇬🇧 Ryan Peniston

The following players received entry as lucky losers:
 * 🇷🇺 Ivan Nedelko
 * 🇪🇨 Roberto Quiroz

Singles

 * 🇺🇸 Mackenzie McDonald def. 🇦🇹 Jurij Rodionov 6–1, 6–2.

Doubles

 * 🇺🇦 Denys Molchanov / 🇰🇿 Aleksandr Nedovyesov def. 🇺🇸 Nathan Pasha / 🇺🇸 Max Schnur 6–4, 6–4.