Richard Gasquet defeated Cameron Norrie in the final, 4–6, 6–4, 6–4 to win the men's singles tennis title at the 2023 ASB Classic. It was his 16th ATP Tour singles title, and his first since 2018.^[1]

Ugo Humbert was the defending champion from when the event was last held in 2020,^[2] but lost in the first round to Christopher Eubanks.

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

	Semifinals							Final
		Constant Lestienne
		Richard Gasquet	w/o
									Richard Gasquet	4	6	6
								2	Cameron Norrie	6	4	4
		Jenson Brooksby	3	4
	2	Cameron Norrie	6	6

	First round							Second round							Quarterfinals							Semifinals
								1	C Ruud	6	3	63
		J Munar	6	1	64				L Đere	3	6	77
		L Đere	3	6	77											L Đere	6	62	5
		C Lestienne	6	6												C Lestienne	2	77	7
		P Cachin	3	1					C Lestienne	1	77	7
	Q	G Barrère	63	77	6			Q	G Barrère	6	64	5
	6	J Isner	77	65	3																		C Lestienne
																							R Gasquet	w/o
								LL	J Sousa	62	2
		R Gasquet	6	6					R Gasquet	77	6
	WC	K Pannu	3	1												R Gasquet	1	6	6
	WC	U Humbert	64	63												D Goffin	6	1	1
	Q	C Eubanks	77	77				Q	C Eubanks	2	4
		D Goffin	6	6					D Goffin	6	6
	5	A Bublik	3	4

	First round							Second round							Quarterfinals							Semifinals
	7	S Báez	61	1
	WC	B Shelton	77	6				WC	B Shelton	3	2
		A Molčan	3	4					Q Halys	6	6
		Q Halys	6	6												Q Halys	63	62
		J Brooksby	62	6	6											J Brooksby	77	77
		F Fognini	77	1	3				J Brooksby	6	0
								3	D Schwartzman	1	0r
																							J Brooksby	3	4
	8	A Mannarino	4	64																		2	C Norrie	6	6
		JJ Wolf	6	77					JJ Wolf	4	4
		M Giron	65	6	7				M Giron	6	6
	LL	F Coria	77	4	5											M Giron	1	77	2
	Q	J Lehečka	6	7											2	C Norrie	6	65	6
	Q	T Monteiro	3	5				Q	J Lehečka	4	77	3
								2	C Norrie	6	64	6

	First round							Qualifying competition
	1	Thiago Monteiro	3	7	78
		Daniel Altmaier	6	5	66
								1	Thiago Monteiro	65	6	6
								WC	Ajeet Rai	77	3	4
	WC	Ajeet Rai	7	0	6
	8	Taro Daniel	5	6	3

	First round							Qualifying competition
	2	Federico Coria	3	6	6
		Luca Van Assche	6	4	2
								2	Federico Coria	3	5
								7	Grégoire Barrère	6	7
		Alexandar Lazarov	1	4
	7	Grégoire Barrère	6	6

	First round							Qualifying competition
	3	Dušan Lajović	6	3	4
		Christopher Eubanks	2	6	6
									Christopher Eubanks	63	7	6
								5	João Sousa	77	5	4
	WC	Finn Reynolds	61	4
	5	João Sousa	77	6

	First round							Qualifying competition
	4	Jiří Lehečka	5	6	6
		Jan Choinski	7	0	2
								4	Jiří Lehečka	6	3	6
								6	Facundo Bagnis	2	6	1
		Tseng Chun-hsin	3	3
	6	Facundo Bagnis	6	6

• Main draw
• Qualifying draw