2023 Croatia Open Umag – Singles

Alexei Popyrin defeated Stan Wawrinka in the final, 6–7^(5–7), 6–3, 6–4 to win the singles tennis title at the 2023 Croatia Open Umag.^[1] It was his second ATP Tour singles title.

Jannik Sinner was the reigning champion,^[2] but chose not to defend his title.

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

	Semifinals							Final
	7	Matteo Arnaldi	77	5	3
		Alexei Popyrin	62	7	6
									Alexei Popyrin	65	6	6
								6	Stan Wawrinka	77	3	4
	6	Stan Wawrinka	6	6
	2	Lorenzo Sonego	3	4

	First round							Second round							Quarterfinals							Semifinals
								1	J Lehečka	6	7
		D Thiem	6	7					D Thiem	3	5
	Q	F Bagnis	4	5											1	J Lehečka	6	2	4
		M Čilić	4	3											7	M Arnaldi	3	6	6
	Q	F Cobolli	6	6				Q	F Cobolli	3	65
	Q	J de Jong	3	2				7	M Arnaldi	6	77
	7	M Arnaldi	6	6																		7	M Arnaldi	77	5	3
																							A Popyrin	62	7	6
								3	S Ofner	4	1
		A Popyrin	6	7					A Popyrin	6	6
		B Bonzi	4	5												A Popyrin	77	7
	WC	D Ajduković	1	2											WC	D Prižmić	62	5
	WC	D Prižmić	6	6				WC	D Prižmić	6	6
		Z Piros	6	6					Z Piros	2	3
	5	C O'Connell	3	4

	First round							Second round							Quarterfinals							Semifinals
	6	S Wawrinka	6	6
	Q	F Misolic	3	2				6	S Wawrinka	7	6
		M-A Hüsler	4	2					F Coria	5	1
		F Coria	6	6											6	S Wawrinka	6	7
		T Daniel	1	7	6										4	R Carballés Baena	4	5
	WC	M Landaluce	6	5	2				T Daniel	3	1
								4	R Carballés Baena	6	6
																						6	S Wawrinka	6	6
	8	A Ramos Viñolas	3	6	3																	2	L Sonego	3	4
		J Munar	6	3	6				J Munar	6	6
		F Marozsán	6	6					F Marozsán	4	3
		JM Cerúndolo	3	2												J Munar	6	1	2
		M Cecchinato	4	77	6										2	L Sonego	3	6	6
		A Shevchenko	6	60	3				M Cecchinato	1	67
								2	L Sonego	6	79

	First round							Qualifying competition
	1	Alejandro Tabilo	4	6	64
		Damir Džumhur	6	4	77
									Damir Džumhur	4	3
								6	Filip Misolic	6	6
	Alt	Pablo Cuevas	5	2
	6	Filip Misolic	7	6

	First round							Qualifying competition
	2	Tomás Barrios Vera	6	6
	WC	Nino Serdarušić	4	2
								2	Tomás Barrios Vera	2	4
									Jesper de Jong	6	6
		Jesper de Jong	4	6	6
	7	Raúl Brancaccio	6	2	3

	First round							Qualifying competition
	3	Andrea Vavassori	2	6	66
		Zdeněk Kolář	6	4	78
									Zdeněk Kolář	4	2
									Flavio Cobolli	6	6
		Flavio Cobolli	6	7
	8	Luca Nardi	1	5

	First round							Qualifying competition
	4	Timofey Skatov	6	6
	WC	Jerko Brkić	2	2
								4	Timofey Skatov	7	4	2
								5	Facundo Bagnis	5	6	6
		Francesco Maestrelli	4	1
	5	Facundo Bagnis	6	6

• Main draw
• Qualifying draw