2023 Lisboa Belém Open – Men's singles

Marco Cecchinato was the defending champion^[1] but chose not to defend his title.

Men's singles
2023 Lisboa Belém Open
Champion	Flavio Cobolli
Runner-up	Benjamin Hassan
Score	7–5, 7–5

Main article: 2023 Lisboa Belém Open

Flavio Cobolli won the title after defeating Benjamin Hassan 7–5, 7–5 in the final.

Seeds

1. Albert Ramos Viñolas (semifinals)
2. Flavio Cobolli (champion)
3. Timofey Skatov (first round)
4. Pablo Llamas Ruiz (second round)
5. Ivan Gakhov (second round)
6. Titouan Droguet (first round)
7. Zdeněk Kolář (first round)
8. Matteo Gigante (first round)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
	1	Albert Ramos Viñolas	3	3
		Benjamin Hassan	6	6
									Benjamin Hassan	5	5
								2	Flavio Cobolli	7	7
		Franco Agamenone	4	1
	2	Flavio Cobolli	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	A Ramos Viñolas	6	3	6
	LL	H Laaksonen	4	6	2			1	A Ramos Viñolas	79	6
	WC	G Elias	6	6				WC	G Elias	67	4
		N Fatić	2	2											1	A Ramos Viñolas	6	6
	WC	J Sousa	6	7											WC	J Sousa	4	2
	LL	H Rocha	2	5				WC	J Sousa	6	6
	WC	P Sousa	6	6				WC	P Sousa	2	3
	6	T Droguet	4	4																		1	A Ramos Viñolas	3	3
	4	P Llamas Ruiz	6	6																			B Hassan	6	6
		A Giannessi	3	1				4	P Llamas Ruiz	4	62
	Q	J Barranco Cosano	3	4				SE	O Roca Batalla	6	77
	SE	O Roca Batalla	6	6											SE	O Roca Batalla	61	4
	Q	F Forti	6	1	3											B Hassan	77	6
		B Hassan	3	6	6				B Hassan	7	6
		G Blancaneaux	4	2				5	I Gakhov	5	1
	5	I Gakhov	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	M Gigante	4	64
		F Agamenone	6	77					F Agamenone	77	6
		S Travaglia	6	2	61			Q	L Mikrut	64	3
	Q	L Mikrut	1	6	77											F Agamenone	77	7
		M Valkusz	6	64	0r											R Bonadio	65	5
		Edoardo Lavagno	3	77	0				E Lavagno	6	3	2
		R Bonadio	6	6					R Bonadio	3	6	6
	3	T Skatov	4	3																			F Agamenone	4	1
	7	Z Kolář	4	3																		2	F Cobolli	6	6
		G-A Bailly	6	6					G-A Bailly	5	77	1
	Q	Alexander Weis	1	3					C Hemery	7	64	6
		C Hemery	6	6												C Hemery	4	3
	Q	O Krutykh	5	6	6										2	F Cobolli	6	6
		Gerard Campana Lee	7	2	3			Q	O Krutykh	62	3
	Q	E Dalla Valle	4	7	0			2	F Cobolli	77	6
	2	F Cobolli	6	5	6