The 2021 Singapore Tennis Open is a tournament on the 2021 ATP Tour. It is played on indoor hard courts in Singapore. It is organised with a single-year licence in 2021, and was held at OCBC Arena in Singapore from February 22 to February 28, 2021.[1][2]
Finals
Singles
Alexei Popyrin def. 
Alexander Bublik, 4–6, 6–0, 6–2.
Doubles
Sander Gillé / Joran Vliegen def. Matthew Ebden / John-Patrick Smith, 6–2, 6–3.
Points and prize money
Point distribution
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q | Q2 | Q1 |
| Singles | 250 | 150 | 90 | 45 | 20 | 0 | 12 | 6 | 0 |
|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 | — | — | — | — |
Prize money
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q2 | Q1 |
| Singles | $24,770 | $18,310 | $13,730 | $9,385 | $6,410 | $4,575 | $2,345 | $1,295 |
| Doubles* | $8,630 | $6,330 | $4,810 | $3,440 | $2,520 | — | — | — |
*per team
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 FRA
|
Adrian Mannarino | 36 | 1 |
| AUS
|
John Millman | 39 | 2 |
 CRO
|
Marin Čilić | 43 | 3 |
| KAZ
|
Alexander Bublik | 45 | 4 |
 JPN
|
Yoshihito Nishioka | 58 | 5 |
 MDA
|
Radu Albot | 85 | 6 |
 RSA
|
Lloyd Harris | 91 | 7 |
 KOR
|
Kwon Soon-woo | 97 | 8 |
- 1 Rankings are as of February 15, 2021
Other entrants
The following players received wildcards into the main draw:
The following player received an entry using a protected ranking into the main draw:
The following players received entry from the qualifying draw:
Withdrawals
Félix Auger-Aliassime → replaced by Alexei Popyrin
Ričardas Berankis → replaced by Marc Polmans- Jérémy Chardy → replaced by
Ernests Gulbis 
Daniel Evans → replaced by Yasutaka Uchiyama- Cameron Norrie → replaced by Taro Daniel
- Vasek Pospisil → replaced by James Duckworth
Casper Ruud → replaced by 
Jason Jung
Emil Ruusuvuori → replaced by 
Roberto Marcora- Yūichi Sugita → replaced by
Yuki Bhambri - Stefano Travaglia → replaced by
Maxime Cressy
Doubles main-draw entrants
Seeds
| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
| BEL
|
Sander Gillé | BEL
|
Joran Vliegen | 77 | 1 |
| IND
|
Rohan Bopanna | JPN
|
Ben McLachlan | 89 | 2 |
| GBR
|
Luke Bambridge | GBR
|
Dominic Inglot | 111 | 3 |
| AUS
|
Matthew Ebden | AUS
|
John-Patrick Smith | 151 | 4 |
- Rankings are as of February 15, 2021.
Other entrants
The following pairs received wildcards into the doubles main draw:
Withdrawals
- Before the tournament
- Dan Evans / Lloyd Glasspool → replaced by Purav Raja / Ramkumar Ramanathan
- Radu Albot / Ričardas Berankis → replaced by Robert Galloway / Alex Lawson
- Harri Heliövaara / Emil Ruusuvuori → replaced by Taro Daniel / Jason Jung
- Lloyd Harris / Stefano Travaglia → replaced by Evan King / Hunter Reese
- Jérémy Chardy / Fabrice Martin → replaced by Sriram Balaji /
Luca Margaroli 
Treat Huey / 
Christopher Rungkat → replaced by Thai-Son Kwiatkowski / Christopher Eubanks
- During the tournament
References
- ^ "Singapore Tennis Open Overview". atptour.com.
- ^ "Tennis: Singapore to host ATP 250 event from Feb 22-28". The Straits Times. Retrieved 26 January 2021.