2023 Open de Oeiras – Singles

Kaichi Uchida was the defending champion but lost in the quarterfinals to Juan Manuel Cerúndolo.

Singles
2023 Open de Oeiras
Champion	Zsombor Piros
Runner-up	Juan Manuel Cerúndolo
Score	6–3, 6–4

Main article: 2023 Open de Oeiras

Zsombor Piros won the title after defeating Cerúndolo 6–3, 6–4 in the final.

Seeds

1. Adrian Mannarino (second round)
2. Alexandre Müller (second round)
3. Sebastian Ofner (semifinals)
4. Juan Manuel Cerúndolo (final)
5. João Sousa (first round)
6. Kaichi Uchida (quarterfinals)
7. Zsombor Piros (champion)
8. Andrea Vavassori (quarterfinals)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• SE = Special exempt
• PR = Protected ranking
• ITF = ITF entry
• JE = Junior exempt
• w/o = Walkover
• r = Retired
• d = Defaulted
• SR = Special ranking

Finals

	Semifinals							Final
	7/SE	Zsombor Piros	6	6
	3	Sebastian Ofner	4	2
								7/SE	Zsombor Piros	6	6
								4	Juan Manuel Cerúndolo	3	4
	4	Juan Manuel Cerúndolo	6	6
	WC	Pedro Sousa	2	4

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	A Mannarino	5	7	6
		A Lazarov	7	5	2			1	A Mannarino	6	2	3
		K Coppejans	6	6					K Coppejans	4	6	6
	Q	J Faria	2	2												K Coppejans	0	2
	Q	Daniel Mérida	6	6											7/SE	Z Piros	6	6
	Q	Cezar Crețu	4	4				Q	D Mérida	4	3
		D Sweeny	2	4				7/SE	Z Piros	6	6
	7/SE	Z Piros	6	6																		7/SE	Z Piros	6	6
	3	S Ofner	6	6																		3	S Ofner	4	2
	Q	P Nouza	3	4				3	S Ofner	2	6	6
		J McCabe	2	6	77				J McCabe	6	1	2
	Alt	J Domingues	6	3	63										3	S Ofner	5	6	6
		C-h Tseng	6	6											8	A Vavassori	7	3	4
	LL	H Squire	2	3					C-h Tseng	3	1
		F Ferreira Silva	2	0				8	A Vavassori	6	6
	8	A Vavassori	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	K Uchida	6	77
		J De Loore	4	63				6	K Uchida	6	1	6
		H Mayot	3	4					A Andreev	1	6	2
		A Andreev	6	6											6	K Uchida	3	3
		M Guinard	1	0r											4	JM Cerúndolo	6	6
	Q	P Llamas Ruiz	6	3				Q	P Llamas Ruiz	4	3
	WC	D Vale	4	4				4	JM Cerúndolo	6	6
	4	JM Cerúndolo	6	6																		4	JM Cerúndolo	6	6
	5	J Sousa	1	3																		WC	P Sousa	2	4
		S Diez	6	6					S Diez	77	6
		E Furness	7	77					E Furness	62	1
	Q	B Harris	5	63												S Diez	5	6	3
	WC	P Sousa	6	6											WC	P Sousa	7	3	6
	WC	H Rocha	3	4				WC	P Sousa	7	77
		FC Jianu	4	63				2	A Müller	5	64
	2	A Müller	6	77

External links

• Main draw
• Qualifying draw