# 2021 Singapore Tennis Open

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.

## 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 | 250 | 150 | 90 | 45 | 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 | — | — | — |
$_{*perteam}$

## Singles main-draw entrants
### Seeds

| Country | Player | Rank$^1$ | 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:
* Adrian Andreev
* Matthew Ebden
* Shintaro Mochizuki
The following player received an entry using a protected ranking into the main draw:
* Yuki Bhambri
The following players received entry from the qualifying draw:
* Altuğ Çelikbilek
* Christopher Eubanks
* Thai-Son Kwiatkowski
* John-Patrick Smith

### 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 | Rank$^1$ | 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:
* Shaheed Alam / Roy Hobbs
* James Cerretani / Adil Shamasdin

### 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

* Kwon Soon-woo / Yasutaka Uchiyama