| Doubles | |
|---|---|
| 2021 Rafa Nadal Open | |
| Champions |  Karol Drzewiecki  Sergio Martos Gornés |
| Runners-up |  Fernando Romboli Jan Zieliński |
| Score | 6–4, 4–6, [10–3] |
Sander Arends and David Pel were the defending champions [1] but chose not to defend their title.
Karol Drzewiecki and Sergio Martos Gornés won the title after defeating Fernando Romboli and Jan Zieliński 6–4, 4–6, [10–3] in the final.
Hans Hach Verdugo / Miguel Ángel Reyes-Varela (semifinals) Fernando Romboli / Jan Zieliński (final)
Sriram Balaji / Ramkumar Ramanathan (semifinals) Karol Drzewiecki / Sergio Martos Gornés (champions)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | H Hach Verdugo MÁ Reyes-Varela | 6 | 6 | ||||||||||||||||||||||||
| WC |  Aaron Cohen Rafael Giotis | 0 | 2 | 1 | H Hach Verdugo MÁ Reyes-Varela | 77 | 6 | ||||||||||||||||||||
| WC | Antoni Nadal Joan Nadal | 2 | 2 |  N Chappell R Stalder | 64 | 2 | |||||||||||||||||||||
| N Chappell R Stalder | 6 | 6 | 1 | H Hach Verdugo MÁ Reyes-Varela | 65 | 6 | [8] | ||||||||||||||||||||
| 4 | K Drzewiecki S Martos Gornés | 77 | 6 | 4 | K Drzewiecki S Martos Gornés | 77 | 4 | [10] | |||||||||||||||||||
 M Geerts  R Roelofse | 63 | 2 | 4 | K Drzewiecki S Martos Gornés | w/o | ||||||||||||||||||||||
 N Mejía  R Quiroz | 5 | 5 |  B Gojo K Żuk | ||||||||||||||||||||||||
| B Gojo K Żuk | 7 | 7 | 4 | K Drzewiecki S Martos Gornés | 6 | 4 | [10] | ||||||||||||||||||||
 MT Barrios Vera C Gómez-Herrera | 6 | 6 | 2 | F Romboli J Zieliński | 4 | 6 | [3] | ||||||||||||||||||||
| J Cerretani JA Ore | 4 | 3 | MT Barrios Vera C Gómez-Herrera | 3 | 0 | ||||||||||||||||||||||
| F Fallert P Matuszewski | 2 | 1 | 3 | S Balaji R Ramanathan | 6 | 6 | |||||||||||||||||||||
| 3 | S Balaji R Ramanathan | 6 | 6 | 3 | S Balaji R Ramanathan | 2 | 62 | ||||||||||||||||||||
| WC |  Tan Jinpeng Nathan Trouvé | 4 | 1 | 2 | F Romboli J Zieliński | 6 | 77 | ||||||||||||||||||||
 R Gonzales H Johnson | 6 | 6 | R Gonzales H Johnson | 6 | 1 | [11] | |||||||||||||||||||||
 T Matsui K Uesugi | 7 | 63 | [10] | 2 | F Romboli J Zieliński | 3 | 6 | [13] | |||||||||||||||||||
| 2 | F Romboli J Zieliński | 5 | 77 | [12] | |||||||||||||||||||||||
Evan King and Nathan Pasha were the defending champions but chose to defend their title with different partners. King partnered Fernando Romboli but lost in the first round to Robert Galloway and Hans Hach Verdugo. Pasha partnered Max Schnur but lost in the first round to Carlos Gómez-Herrera and Viktor Troicki.
Pavel Kotov and Roman Safiullin were the defending champions but chose not to defend their title.
This was the first edition of the tournament.
This was the second edition of the tournament in the 2021 tennis season. Lloyd Glasspool and Harri Heliövaara were the defending champions but lost in the quarterfinals to Enzo Couacaud and Manuel Guinard.
André Göransson and Nathaniel Lammons were the defending champions but chose not to defend their title.
Hunter Reese and Sem Verbeek were the defending champions but chose not to defend their title.
Andrea Vavassori and David Vega Hernández were the defending champions but only Vega Hernández chose to defend his title, partnering Fernando Romboli. Vega Hernández lost in the semifinals to Zdeněk Kolář and Jiří Lehečka.
The 2021 Rafa Nadal Open was a professional tennis tournament played on hard courts. It was the third edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Manacor, Spain between 30 August and 5 September 2021.
Szymon Walków and Jan Zieliński were the defending champions but chose not to defend his title.
Ruben Bemelmans and Tim Pütz were the defending champions but chose not to defend their title.
Orlando Luz and Felipe Meligeni Alves were the defending champions but only Meligeni Alves chose to defend his title, partnering Marcelo Demoliner. Meligeni Alves lost in the quarterfinals to Marco Bortolotti and Sergio Martos Gornés.
Zdeněk Kolář and Luis David Martínez were the defending champions but only Martínez chose to defend his title, partnering Fabien Reboul. Martínez lost in the semifinals to Ivan and Matej Sabanov.
Karol Drzewiecki and Sergio Martos Gornés were the defending champions but only Martos Gornés chose to defend his title, partnering Marco Bortolotti. Martos Gornés lost in the semifinals to Yuki Bhambri and Saketh Myneni.
Victor Vlad Cornea and Petr Nouza were the defending champions but chose to defend their title with different partners. Cornea partnered Sergio Martos Gornés but lost in the semifinals to Sander Arends and David Pel. Nouza partnered Vitaliy Sachko but lost in the first round to Cornea and Martos Gornés.
Victor Vlad Cornea and Sergio Martos Gornés were the defending champions but only Martos Gornés chose to defend his title, partnering Marco Bortolotti. Martos Gornés lost in the semifinals to Matteo Gigante and Francesco Passaro.
Christian Harrison and Shintaro Mochizuki were the defending champions but only Harrison chose to defend his title, partnering Andrew Harris. Harrison successfully defended his title, defeating Luke Johnson and Sem Verbeek 7–6(8–6), 6–7(4–7), [10–8] in the final.
Diego Hidalgo and Cristian Rodríguez were the defending champions but lost in the final to Pedro Boscardin Dias and João Lucas Reis da Silva.
Francisco Comesaña and Luciano Darderi were the defending champions but only Comesaña chose to defend his title, partnering Román Andrés Burruchaga. Comesaña lost in the quarterfinals to Anirudh Chandrasekar and Vijay Sundar Prashanth.
Sadio Doumbia and Fabien Reboul were the defending champions but chose not to defend their title.
Luciano Darderi and Fernando Romboli were the defending champions but chose to defend their title with different partners. Darderi partnered Andrea Collarini but lost in the first round to Marco Bortolotti and Sergio Martos Gornés. Romboli partnered Marcelo Zormann but lost in the first round to Boris Arias and Federico Zeballos.