| Men's doubles | |
|---|---|
| 2021 President's Cup | |
| Champions |  Hsu Yu-hsiou  Benjamin Lock |
| Runners-up |  Peter Polansky  Sergiy Stakhovsky |
| Score | 2–6, 6–1, [10–7] |
Andrey Golubev and Aleksandr Nedovyesov were the defending champions [1] but chose not to defend their title.
Hsu Yu-hsiou and Benjamin Lock won the title after defeating Peter Polansky and Sergiy Stakhovsky 2–6, 6–1, [10–7] in the final.
Peter Polansky / Sergiy Stakhovsky (final)
Max Purcell / Akira Santillan (first round)
Pavel Kotov / Vladyslav Manafov (quarterfinals) Hsu Yu-hsiou / Benjamin Lock (champions)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | P Polansky S Stakhovsky | 6 | 3 | [10] | |||||||||||||||||||||||
| WC | A Dubrivnyy  G Lomakin | 4 | 6 | [6] | 1 | P Polansky S Stakhovsky | 6 | 6 | |||||||||||||||||||
 Y-s Chung  K Sultanov | 6 | 7 | Y-s Chung K Sultanov | 2 | 3 | ||||||||||||||||||||||
J Kubler  E Leshem | 3 | 5 | 1 | P Polansky S Stakhovsky | 3 | 6 | [10] | ||||||||||||||||||||
| 3 | P Kotov V Manafov | 6 | 6 |  A Bega  C Denolly | 6 | 4 | [8] | ||||||||||||||||||||
| WC | D Golubev A Zakharov | 4 | 2 | 3 | P Kotov V Manafov | 66 | 2 | ||||||||||||||||||||
| E Karlovskiy D Yevseyev | 6 | 3 | [5] | A Bega C Denolly | 78 | 6 | |||||||||||||||||||||
| A Bega C Denolly | 3 | 6 | [10] | 1 | P Polansky S Stakhovsky | 6 | 1 | [7] | |||||||||||||||||||
| WC | T Khabibulin Dostanbek Tashbulatov | 0 | 3 | 4 | Y-h Hsu B Lock | 2 | 6 | [10] | |||||||||||||||||||
| A Kuznetsov R Safiullin | 6 | 6 | A Kuznetsov R Safiullin | 77 | 4 | [7] | |||||||||||||||||||||
 J Clarke  E Kırkın | 2 | 2 | 4 | Y-h Hsu B Lock | 65 | 6 | [10] | ||||||||||||||||||||
| 4 | Y-h Hsu B Lock | 6 | 6 | 4 | Y-h Hsu B Lock | 6 | 77 | ||||||||||||||||||||
 M Bašić  M Jaziri | 77 | 4 | [11] |  L Catarina H Grenier | 0 | 62 | |||||||||||||||||||||
 N Chappell R Peniston | 64 | 6 | [13] | N Chappell R Peniston | 3 | 6 | [5] | ||||||||||||||||||||
| L Catarina H Grenier | 610 | 6 | [10] | L Catarina H Grenier | 6 | 4 | [10] | ||||||||||||||||||||
| 2 | M Purcell A Santillan | 712 | 4 | [4] | |||||||||||||||||||||||
Sergiy Stakhovsky was the defending champion, but lost in the first round to Benjamin Becker.
Mikhail Kukushkin defeated 1st seed Mikhail Youzhny 6–3, 7–6(7–2) to win this tournament.
John Isner successfully defended his title by beating Tomáš Berdych 3–6, 6–4, 7–6(11–9) in the final.
Roger Federer was the three-time defending champion, but lost in the semifinals to Alexander Zverev.
Alex de Minaur and Blake Ellis were the defending champions, but both players chose not to participate.
Nicola Kuhn and Zsombor Piros won the boys' doubles tennis title at the 2017 French Open, defeating Vasil Kirkov and Danny Thomas in the final, 6–4, 6–4.
Kenneth Raisma and Stefanos Tsitsipas were the defending champions but both players were no longer eligible to participate in junior events.
Juan Carlos Aguilar and Felipe Meligeni Alves were the defending champions, but both players were ineligible to participate.
Rafael Nadal defeated Nick Kyrgios in the final, 6–2, 6–1 to win the men's singles tennis title at the 2017 China Open. Nadal saved two match points en route to the title, in his first-round match against Lucas Pouille.
Jonathan Eysseric and Sergiy Stakhovsky were the defending champions but chose not to defend their title.
Frances Tiafoe was the defending champion but chose not to defend his title.
Dudi Sela was the defending champion but chose not to defend his title.
Márton Fucsovics was the defending champion but chose not to defend his title.
Jérémy Chardy was the defending champion but chose not to defend his title.
The 2021 President's Cup was a professional tennis tournament played on outdoor hard courts. It was the fifteenth and twelfth editions of the tournament which were part of the 2021 ATP Challenger Tour and the 2021 ITF Women's World Tennis Tour. It took place in Nur-Sultan, Kazakhstan between 12 and 18 July 2021.
Evgeny Donskoy was the defending champion but chose not to defend his title.
Max Purcell was the defending champion but chose not to defend his title.
Hsu Yu-hsiou and Benjamin Lock were the defending champions and successfully defended their title, defeating Oleksii Krutykh and Grigoriy Lomakin 6–3, 6–4 in the final.
Sander Arends and David Pel were the defending champions but chose not to defend their title.
Hsu Yu-hsiou and Benjamin Lock were the defending champions but only Lock chose to defend his title, partnering Grigoriy Lomakin. Lock lost in the semifinals to Andrew Paulson and David Poljak.
Darian King and Peter Polansky were the defending champions but chose not to defend their title.