Singles
2021 Sibiu Open
Champion	Stefano Travaglia
Runner-up	Thanasi Kokkinakis
Score	7–6(7–4), 6–2

Marc-Andrea Hüsler was the defending champion^[1] but lost in the semifinals to Thanasi Kokkinakis.

Stefano Travaglia won the title after defeating Kokkinakis 7–6^(7–4), 6–2 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	1	Stefano Travaglia	6	0	6
	8	Sumit Nagal	4	6	0
								1	Stefano Travaglia	77	6
								7	Thanasi Kokkinakis	64	2
	7	Thanasi Kokkinakis	6	6
	6	Marc-Andrea Hüsler	2	1

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	S Travaglia	6	6
		L Rosol	3	3				1	S Travaglia	6	6
	Q	Yan Bondarevskiy	6	6				Q	Y Bondarevskiy	3	2
	WC	Vlad Andrei Dancu	2	3											1	S Travaglia	6	5	78
	Q	Ștefan Paloși	7	6											5	Z Kolář	0	7	66
	Q	ND Ionel	5	1				Q	Ș Paloși	5	5
		M Copil	5	4				5	Z Kolář	7	7
	5	Z Kolář	7	6																		1	S Travaglia	6	0	6
	4	D Džumhur	6	6																		8	S Nagal	4	6	0
	WC	P Tsitsipas	2	0				4	D Džumhur	2	6	2
	LL	Elmar Ejupovic	1	3					G Blancaneaux	6	4	6
		G Blancaneaux	6	6												G Blancaneaux	63	3
		J Lehečka	77	6											8	S Nagal	77	6
		FC Jianu	65	2					J Lehečka	5	3
		L Miedler	3	1				8	S Nagal	7	6
	8	S Nagal	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	7	T Kokkinakis	6	6
		M Marterer	4	3				7	T Kokkinakis	6	6
		E Kırkın	7	4	6				E Kırkın	1	1
		A Vatutin	5	6	1										7	T Kokkinakis	6	77
		V Kopřiva	7	7											3	A Molčan	2	64
		D Petrović	5	5					V Kopřiva	6	0	4
		R Bonadio	4	2				3	A Molčan	1	6	6
	3	A Molčan	6	6																		7	T Kokkinakis	6	6
	6	M-A Hüsler	6	6																		6	M-A Hüsler	2	1
		J Sels	3	3				6	M-A Hüsler	6	6
		J Clarke	65	4				Q	Y Oliel	4	1
	Q	Y Oliel	77	6											6	M-A Hüsler	77	6
		F Agamenone	6	77												F Agamenone	65	4
	WC	VV Cornea	1	63					F Agamenone	77	7
		V Sachko	6	6					V Sachko	64	5
	2	R Albot	3	3

References

External links

• Main draw
• Qualifying draw