2021 Singapore Tennis Open – Singles

Singles
2021 Singapore Tennis Open
Champion	Alexei Popyrin
Runner-up	Alexander Bublik
Score	4–6, 6–0, 6–2
Draw	28 (4 Q / 3 WC )
Seeds	8

Main article: 2021 Singapore Tennis Open

Alexei Popyrin defeated Alexander Bublik 4–6, 6–0, 6–2 to claim his first ATP Tour Men's Singles tennis title at the 2021 Singapore Open. The Singapore Tennis Open was a new addition to the ATP Tour in 2021

Seeds

The top four seeds receive a bye into the second round.

1. Adrian Mannarino (quarterfinals)
2. John Millman (second round)
3. Marin Čilić (semifinals)
4. Alexander Bublik (final)
5. Yoshihito Nishioka (quarterfinals)
6. Radu Albot (semifinals)
7. Lloyd Harris (first round)
8. Kwon Soon-woo (quarterfinals)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
	6	Radu Albot	6	3	4
	4	Alexander Bublik	2	6	6
								4	Alexander Bublik	6	0	2
									Alexei Popyrin	4	6	6
	3	Marin Čilić	65	62
		Alexei Popyrin	77	77

Top half

	First round							Second round							Quarterfinals							Semifinals
								1	A Mannarino	6	7
		R Marcora	7	6					R Marcora	3	5
		E Gulbis	5	4											1	A Mannarino	3	4
		J Duckworth	2	4											6	R Albot	6	6
		Y Hanfmann	6	6					Y Hanfmann	77	67	3
	Q	J-P Smith	2	6	1			6	R Albot	62	79	6
	6	R Albot	6	3	6																	6	R Albot	6	3	4
																						4	A Bublik	2	6	6
								4	A Bublik	6	6
	WC	S Mochizuki	0	4				Q	A Çelikbilek	2	2
	Q	A Çelikbilek	6	6											4	A Bublik	6	6
		J Jung	64	2											5	Y Nishioka	3	2
		M Cressy	77	6					M Cressy	4	2
		M Mmoh	2	6	3			5	Y Nishioka	6	6
	5	Y Nishioka	6	3	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	S-w Kwon	4	6	6
	Q	T-S Kwiatkowski	6	3	4			8	S-w Kwon	6	6
		Y Uchiyama	6	2	6				Y Uchiyama	3	4
		M Polmans	4	6	4										8	S-w Kwon	2	6	5
		T Daniel	6	63	6										3	M Čilić	6	2	7
		R Ramanathan	3	77	3				T Daniel	5	4
								3	M Čilić	7	6
																						3	M Čilić	65	62
	7	L Harris	6	3	4																		A Popyrin	77	77
	WC	A Andreev	1	6	6			WC	A Andreev	1	7	3
	Q	C Eubanks	65	65					A Popyrin	6	5	6
		A Popyrin	77	77												A Popyrin	6	79
	PR	Y Bhambri	3	63											WC	M Ebden	4	67
	WC	M Ebden	6	77				WC	M Ebden	6	6
								2	J Millman	4	1

Qualifying

Seeds

1. Thai-Son Kwiatkowski (qualified)
2. Matteo Viola (qualifying competition)
3. Christopher Eubanks (qualified)
4. Malek Jaziri (qualifying competition)
5. Altuğ Çelikbilek (qualified)
6. John-Patrick Smith (qualified)
7. Alessandro Bega (qualifying competition)
8. Vladyslav Orlov (first round)

Qualifiers

1. Thai-Son Kwiatkowski
2. Altuğ Çelikbilek
3. Christopher Eubanks
4. John-Patrick Smith

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Thai-Son Kwiatkowski	6	77
	Alt	Luke Bambridge	4	64
								1	Thai-Son Kwiatkowski	6	6
								Alt	Robert Galloway	2	3
	Alt	Robert Galloway	6	6
	8	Vladyslav Orlov	4	4

Second qualifier

	First round							Qualifying competition
	2	Matteo Viola	6	6
	Alt	Alex Lawson	3	2
								2	Matteo Viola	2	6	65
								5	Altuğ Çelikbilek	6	0	77
		Evan King	2	4
	5	Altuğ Çelikbilek	6	6

Third qualifier

	First round							Qualifying competition
	3	Christopher Eubanks	6	6
	Alt	Rohan Bopanna	3	4
								3	Christopher Eubanks	6	6
								7	Alessandro Bega	1	2
		Fabrizio Ornago	5	2
	7	Alessandro Bega	7	6

Fourth qualifier

	First round							Qualifying competition
	4	Malek Jaziri	6	6
	WC	Shaheed Alam	1	3
								4	Malek Jaziri	5	65
								6	John-Patrick Smith	7	77
	WC	Roy Hobbs	1	1
	6	John-Patrick Smith	6	6

External links

• Main draw
• Qualifying draw