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| Doubles | |
|---|---|
| 2021 Singapore Tennis Open | |
| Champions |  Sander Gillé Joran Vliegen |
| Runners-up |  Matthew Ebden John-Patrick Smith |
| Final score | 6–2, 6–3 |
The Singapore Tennis Open was a new addition to the ATP Tour in 2021.
Sander Gillé and Joran Vliegen won the title, defeating Matthew Ebden and John-Patrick Smith in the final, 6–2, 6–3.
Sander Gillé / Joran Vliegen (Champions)
Rohan Bopanna / 
Ben McLachlan (First round)
Luke Bambridge / Dominic Inglot (Semifinals) Matthew Ebden / John-Patrick Smith (Final)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | S Gillé J Vliegen | 77 | 6 | ||||||||||||||||||||||||
 E King H Reese | 63 | 3 | 1 | S Gillé J Vliegen | 6 | 77 | |||||||||||||||||||||
 S-w Kwon Y Uchiyama | P Raja R Ramanathan | 4 | 63 | ||||||||||||||||||||||||
| P Raja R Ramanathan | w/o | 1 | S Gillé J Vliegen | 6 | 6 | ||||||||||||||||||||||
| 3 | L Bambridge D Inglot | 6 | 6 | 3 | L Bambridge D Inglot | 4 | 4 | ||||||||||||||||||||
 Y Hanfmann J Millman | 3 | 3 | 3 | L Bambridge D Inglot | 77 | 77 | |||||||||||||||||||||
| WC | J Cerretani  A Shamasdin | 6 | 7 | WC | J Cerretani A Shamasdin | 64 | 61 | ||||||||||||||||||||
 A Bublik M Polmans | 1 | 5 | 1 | S Gillé J Vliegen | 6 | 6 | |||||||||||||||||||||
| R Galloway A Lawson | 7 | 6 | 4 | M Ebden J-P Smith | 2 | 3 | |||||||||||||||||||||
T Daniel  J Jung | 5 | 3 | R Galloway A Lawson | 4 | 6 | [5] | |||||||||||||||||||||
| Alt | T-S Kwiatkowski C Eubanks | 4 | 2 | 4 | M Ebden J-P Smith | 6 | 3 | [10] | |||||||||||||||||||
| 4 | M Ebden J-P Smith | 6 | 6 | 4 | M Ebden J-P Smith | 6 | 6 | ||||||||||||||||||||
| WC |  S Alam R Hobbs | 5 | 1 |  LD Martínez  D Vega Hernández | 4 | 4 | |||||||||||||||||||||
S Balaji  L Margaroli | 7 | 6 | S Balaji L Margaroli | 4 | 6 | [10] | |||||||||||||||||||||
| LD Martínez D Vega Hernández | 6 | 6 | LD Martínez D Vega Hernández | 6 | 2 | [12] | |||||||||||||||||||||
| 2 | R Bopanna B McLachlan | 4 | 2 | ||||||||||||||||||||||||
Dustin Brown and Rameez Junaid were the defending champions but chose not to defend their title.
Grégoire Barrère and Tristan Lamasine were the defending champions but only Lamasine chose to defend his title, partnering Hugo Nys. Lamasine lost in the quarterfinals to Gero Kretschmer and Alexander Satschko.
Robin Haase and Tim Pütz were the defending champions but chose not to defend their title.
Federico Gaio and Stefano Napolitano were the defending champions but only Napolitano chose to defend his title, partnering Salvatore Caruso. Napolitano withdrew in the semifinals.
Evgeny Donskoy and Mikhail Elgin were the defending champions but chose not to defend their title.
Mikhail Elgin and Igor Zelenay were the defending champions but chose not to defend their title.
James Cerretani and Antal van der Duim were the defending champions but only Cerretani chose to defend his title, partnering Nicholas Monroe. Cerretani lost in the first round to Ruben Bemelmans and Jonathan Eysseric.
Andreas Mies and Oscar Otte were the defending champions but only Mies chose to defend his title, partnering Kevin Krawietz. Mies successfully defended his title.
Laurynas Grigelis and Zdeněk Kolář were the defending champions but chose not to defend their title.
Sander Arends and Antonio Šančić were the defending champions but only Šančić chose to defend his title, partnering Purav Raja. Šančić lost in the finals to Sander Gillé and Joran Vliegen.
Facundo Bagnis and Ariel Behar were the defending champions but only Bagnis chose to defend his title, partnering Franco Agamenone. Bagnis lost in the first round to Sander Gillé and Joran Vliegen.
This was the first edition of the tournament.
Matteo Berrettini and Daniele Bracciali were the defending champions, but chose not to participate this year.
Roman Jebavý and Andrés Molteni were the defending champions, but chose not to participate together. Jebavý played alongside Matwé Middelkoop but lost in the semifinals to Philipp Oswald and Filip Polášek. Molteni partnered Leonardo Mayer but lost in the first round to Oliver Marach and Jürgen Melzer.
This was the first edition of the tournament.
This was the first edition of the tournament.
Sander Gillé and Joran Vliegen were the defending champions but lost in the first round to Sander Arends and David Pel.
Sander Gillé and Joran Vliegen won the title, defeating Max Purcell and Luke Saville in the final, 7–5, 6–3. This was the first edition of the tournament, primarily organised due to the cancellation of many tournaments during the 2020 season, because of the ongoing COVID-19 pandemic.
Rajeev Ram and Joe Salisbury were the defending champions, but lost to Ivan Dodig and Filip Polášek 6–3, 6–4 in the final.
Barbora Krejčíková and Nikola Mektić were the defending champions, but both players chose to participate with different partners. Krejčíková played alongside Rajeev Ram and successfully defended the title. Mektić partnered Barbora Strýcová, but lost in the first round to alternates Hayley Carter and Sander Gillé.
| Grand Slam events | |
|---|---|
| ATP Tour Masters 1000 | |
| ATP Tour 500 | |
| ATP Tour 250 |
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| Team events | |
 – Tournaments are affected by the COVID-19 pandemic * – Tournaments are introduced due to the impact of the COVID-19 pandemic | |