2021 Astana Open

The 2021 Astana Open was a tennis tournament organized for professional tennis players, held in Astana, Kazakhstan, in 2021 on indoor hard courts. It was primarily organized due to the cancellation of many tournaments during the 2021 ATP Tour and 2021 WTA Tour, because of the ongoing COVID-19 pandemic. It is the second edition of the tournament for the men and the first for the women. The tournament took place in Nur-Sultan, Kazakhstan, from 20–26 September for the men, and from 27 September to 2 October for the women.

Men's singles

 * 🇰🇷 Kwon Soon-woo def. 🇦🇺 James Duckworth, 7–6(8–6), 6–3

This was Kwon's first ever career ATP title.

Women's singles

 * 🇧🇪 Alison Van Uytvanck def. 🇰🇿 Yulia Putintseva, 1–6, 6–4, 6–3.

This was Van Uytvanck's fifth singles title, and first of the year.

Men's doubles

 * 🇲🇽 Santiago González / 🇦🇷 Andrés Molteni def. 🇮🇱 Jonathan Erlich / 🇧🇾 Andrei Vasilevski, 6–1, 6–2

Women's doubles

 * 🇩🇪 Anna-Lena Friedsam / 🇷🇴 Monica Niculescu def. 🇷🇺 Angelina Gabueva / 🇷🇺 Anastasia Zakharova 6–2, 4–6, [10–5]

Seeds

 * Rankings are as of September 13, 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇰🇿 Mikhail Kukushkin
 * 🇰🇿 Timofey Skatov
 * 🇪🇸 Fernando Verdasco

The following players received entry from the qualifying draw:
 * 🇷🇺 Evgeny Donskoy
 * 🇦🇺 Marc Polmans
 * 🇰🇿 Dmitry Popko
 * 🇸🇪 Elias Ymer

Withdrawals

 * Before the tournament
 * Cristian Garín → replaced by 🇱🇹 Ričardas Berankis
 * 🇫🇷 Adrian Mannarino → replaced by 🇨🇴 Daniel Elahi Galán
 * 🇺🇸 Mackenzie McDonald → replaced by 🇪🇸 Carlos Taberner

Seeds

 * Rankings are as of September 13, 2021

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇰🇿 Alexander Bublik / 🇷🇺 Daniil Golubev
 * 🇰🇿 Dmitry Popko / 🇰🇿 Timofey Skatov

Withdrawals

 * Before the tournament
 * 🇺🇸 Nathaniel Lammons / 🇺🇸 Mackenzie McDonald → replaced by 🇩🇪 Andre Begemann / 🇺🇸 Nathaniel Lammons

Seeds

 * Rankings are as of September 20, 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇰🇿 Anna Danilina
 * 🇰🇿 Zhibek Kulambayeva
 * 🇷🇺 Anastasia Potapova

The following players received entry using protected rankings:
 * 🇷🇺 Vitalia Diatchenko
 * 🇧🇾 Vera Lapko
 * 🇱🇺 Mandy Minella

The following players received entry from the qualifying draw:
 * 🇬🇧 Katie Boulter
 * 🇧🇾 Yuliya Hatouka
 * 🇷🇸 Aleksandra Krunić
 * 🇺🇦 Lesia Tsurenko
 * 🇷🇺 Natalia Vikhlyantseva
 * 🇷🇺 Anastasia Zakharova

Withdrawals

 * Before the tournament
 * 🇷🇴 Irina-Camelia Begu → replaced by Ekaterine Gorgodze
 * Polona Hercog → replaced by 🇷🇴 Jaqueline Cristian
 * 🇯🇵 Nao Hibino → replaced by 🇷🇺 Vitalia Diatchenko
 * 🇺🇦 Anhelina Kalinina → replaced by Stefanie Vögele
 * 🇪🇸 Nuria Párrizas Díaz → replaced by 🇱🇺 Mandy Minella
 * 🇷🇺 Liudmila Samsonova → replaced by 🇩🇪 Jule Niemeier
 * 🇸🇰 Anna Karolína Schmiedlová → replaced by 🇨🇿 Kristýna Plíšková
 * 🇷🇸 Nina Stojanović → replaced by 🇩🇪 Anna-Lena Friedsam
 * Clara Tauson → replaced by Lesley Pattinama Kerkhove
 * 🇷🇺 Vera Zvonareva → replaced by 🇧🇾 Vera Lapko

Seeds

 * Rankings are as of September 20, 2021

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇰🇿 Gozal Ainitdinova / 🇰🇿 Zhibek Kulambayeva
 * 🇰🇿 Sofiya Chursina / 🇰🇿 Yekaterina Dmitrichenko

Withdrawals

 * Before the tournament
 * 🇷🇺 Natela Dzalamidze / 🇷🇺 Kamilla Rakhimova → replaced by 🇷🇺 Natela Dzalamidze / Kaja Juvan
 * 🇩🇪 Vivian Heisen / 🇧🇪 Kimberley Zimmermann → replaced by 🇷🇺 Vitalia Diatchenko / 🇷🇺 Yana Sizikova
 * Oksana Kalashnikova / 🇯🇵 Miyu Kato → replaced by 🇷🇺 Varvara Gracheva / Oksana Kalashnikova
 * 🇷🇸 Aleksandra Krunić / 🇷🇸 Nina Stojanović → replaced by 🇮🇳 Rutuja Bhosale / 🇬🇧 Emily Webley-Smith