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

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.^[1] 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.

Draw

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

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

References

External links

• Main draw
• Qualifying draw