Singles
2023 Sibiu Open
Final
Champion	Nerman Fatić
Runner-up	Damir Džumhur
Score	6–2, 6–4
Events
Singles Doubles
← 2022 · Sibiu Open · 2024 →

Nerman Fatić was the defending champion^[1] and successfully defended his title after defeating Damir Džumhur 6–2, 6–4 in the final.

	Semifinals							Final
	1	Zsombor Piros	2	6	1
	8	Nerman Fatić	6	1	6
								8	Nerman Fatić	6	6
								3	Damir Džumhur	2	4
	3	Damir Džumhur	7	6
	2	Flavio Cobolli	5	4

	First round							Second round							Quarterfinals							Semifinals
	1	Z Piros	6	6
		N Sánchez Izquierdo	3	3				1	Z Piros	6	6
	Q	A Paulson	6	6				Q	A Paulson	3	4
		N Serdarušić	2	1											1	Z Piros	6	4	6
	Q	C Hemery	6	6											Q	C Hemery	3	6	1
		M Valkusz	1	1				Q	C Hemery	6	6
	WC	B Artnak	3					WC	B Artnak	4	2
	7	A Giannessi	0r																			1	Z Piros	2	6	1
	4	I Gakhov	6	4	7																	8	N Fatić	6	1	6
		C Tabur	1	6	5			4	I Gakhov	77	61	77
		Alexander Weis	6	4	6				A Weis	65	77	65
	Q	M Vrbenský	4	6	2										4	I Gakhov	1	6	2
		S Diez	2	5											8	N Fatić	6	2	6
		R Bonadio	6	7					R Bonadio	7	67	4
	Q	Vlad Andrei Dancu	4	4				8	N Fatić	5	79	6
	8	N Fatić	6	6

	First round							Second round							Quarterfinals							Semifinals
	5	S Travaglia	77	6
	WC	Sebastian Gima	62	3				5	S Travaglia	7	6
		C Taberner	64	2					G Blancaneaux	5	3
		G Blancaneaux	77	6											5	S Travaglia	4	4
	Q	H Laaksonen	6	0	2										3	D Džumhur	6	6
		M Echargui	2	6	6				M Echargui	4	1
		ND Ionel	3	62				3	D Džumhur	6	6
	3	D Džumhur	6	77																		3	D Džumhur	7	6
	6	D Ajduković	3	6	6																	2	F Cobolli	5	4
		F Maestrelli	6	3	4			6	D Ajduković	4	6	6
		G Fonio	77	6					G Fonio	6	3	2
	WC	C Crețu	61	3											6	D Ajduković	2	3
	Q	FC Jianu	64	4											2	F Cobolli	6	6
		Edoardo Lavagno	77	6					E Lavagno	5	2
		S Caruso	77	4	4			2	F Cobolli	7	6
	2	F Cobolli	65	6	6

• Main draw
• Qualifying draw