Alexander Bublik defeated Arthur Fils in the final, 6–4, 6–4 to win the singles title at the 2023 European Open. It was his third ATP Tour singles title.

Félix Auger-Aliassime was the reigning champion,^[1] but chose to compete in Tokyo instead.

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

	Semifinals							Final
	1	Stefanos Tsitsipas	65	64
	4	Arthur Fils	77	77
								4	Arthur Fils	4	4
								3	Alexander Bublik	6	6
	3	Alexander Bublik	6	6
	Q	Maximilian Marterer	4	4

	First round							Second round							Quarterfinals							Semifinals
								1	S Tsitsipas	7	6
		D Stricker	77	3	3				B van de Zandschulp	5	3
		B van de Zandschulp	64	6	6										1	S Tsitsipas	6	6
	WC	L Nardi	6	67	2										5	Y Hanfmann	3	3
		D Thiem	3	79	6				D Thiem	4	7	4
	Q	A Blockx	4	63				5	Y Hanfmann	6	5	6
	5	Y Hanfmann	6	77																		1	S Tsitsipas	65	64
																						4	A Fils	77	77
								4	A Fils	77	77
		J Munar	3	4				WC	M Lajal	64	62
	WC	M Lajal	6	6											4	A Fils	6	6
	Q	B Bonzi	77	65	3										8	JP Varillas	0	3
		A Shevchenko	65	77	6				A Shevchenko	6	3	2
		F Marozsán	67	4				8	JP Varillas	3	6	6
	8	JP Varillas	79	6

	First round							Second round							Quarterfinals							Semifinals
	6	R Carballés Baena	6	3	64
	Q	G Mpetshi Perricard	0	6	77			Q	G Mpetshi Perricard	7	6
	WC	D Goffin	6	6				WC	D Goffin	5	3
		Q Halys	4	1											Q	G Mpetshi Perricard	4	6	2
		G Barrère	6	77											3	A Bublik	6	4	6
		DE Galán	1	65					G Barrère	4	2
								3	A Bublik	6	6
																						3	A Bublik	6	6
	7	R Gasquet	3	4																		Q	M Marterer	4	4
	Q	M Marterer	6	6				Q	M Marterer	6	77
		N Borges	78	6					N Borges	3	63
		D Koepfer	66	4											Q	M Marterer	6	6
		A Rinderknech	67	4												H Gaston	3	2
		H Gaston	79	6					H Gaston	5	77	713
								2	J-L Struff	7	65	611

	First round							Qualifying competition
	1	Benjamin Bonzi	6	6
		Oscar Otte	1	2
								1	Benjamin Bonzi	7	7
								5	Giulio Zeppieri	5	5
	Alt	Hugo Grenier	3	4
	5	Giulio Zeppieri	6	6

	First round							Qualifying competition
	2	Hamad Medjedovic	63	2
	WC	Alexander Blockx	77	6
								WC	Alexander Blockx	6	7
								WC	Gilles Arnaud Bailly	4	5
	WC	Gilles Arnaud Bailly	77	5	77
	6	Pablo Llamas Ruiz	65	7	65

	First round							Qualifying competition
	3	Maxime Cressy	2	6	61
		Gauthier Onclin	6	1	77
									Gauthier Onclin	4	2
								Alt	Giovanni Mpetshi Perricard	6	6
	Alt	Giovanni Mpetshi Perricard	6	77
	7	Antoine Escoffier	1	64

	First round							Qualifying competition
	4	Maximilian Marterer	6	6
		Gijs Brouwer	1	4
								4	Maximilian Marterer	6	6
								8	Titouan Droguet	4	4
		Zizou Bergs	5	79	2
	8	Titouan Droguet	7	67	6

• Main draw
• Qualifying draw