2025 Open de Oeiras – Singles

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

Elmer Møller won the title after defeating Francisco Comesaña 6–0, 6–4 in the final.^[2]

	Semifinals							Final
	1	Francisco Comesaña	6	6
		Carlos Taberner	1	2
								1	Francisco Comesaña	0	4
									Elmer Møller	6	6
		Elmer Møller	6	6
	2	Roman Safiullin	2	4

	First round							Second round							Quarterfinals							Semifinals
	1	F Comesaña	4	6	6
	WC	G Elias	6	3	2			1	F Comesaña	7	77
		T Boyer	6	1	6				T Boyer	5	64
	Q	D Yevseyev	1	6	4										1	F Comesaña	7	6
		G Barrère	6	7												G Barrère	5	4
		L Van Assche	4	5					G Barrère	6	714
		L Klein	4	2				Q	S Travaglia	4	612
	Q	S Travaglia	6	6																		1	F Comesaña	6	6
	3	R Collignon	6	6																			C Taberner	1	2
		J Kym	2	2				3	R Collignon	6	77
	Q	G den Ouden	7	4	77			Q	G den Ouden	4	62
	Q	B Zapata Miralles	5	6	65										3	R Collignon	64	65
		C Taberner	6	77												C Taberner	77	77
		N Budkov Kjær	3	64					C Taberner	7	6
		S Mochizuki	2	6	7				S Mochizuki	5	3
	7	T Seyboth Wild	6	1	5

	First round							Second round							Quarterfinals							Semifinals
	8	V Royer	0	77	6
	Q	JM Cerúndolo	6	65	2			8	V Royer	63	3
	WC	Pedro Araújo	3	1				Q	R Bertola	77	6
	Q	R Bertola	6	6											Q	R Bertola	1	65
		M Kukushkin	6	6												E Møller	6	77
	Alt	M Gigante	4	4					M Kukushkin
		E Møller	6	62	6				E Møller	w/o
	4	T Monteiro	3	77	1																		E Møller	6	6
	6	D Lajović	6	77																		2	R Safiullin	2	4
	WC	Tiago Pereira	2	60				6	D Lajović	6	6
		U Blanchet	6	6					U Blanchet	4	2
	Alt	J Choinski	1	3											6	D Lajović	4	0r
	LL	A Moro Cañas	6	710											2	R Safiullin	6	3
		H Rocha	4	68				LL	A Moro Cañas	7	5	68
		A Blockx	4	3				2	R Safiullin	5	7	710
	2	R Safiullin	6	6

• Main draw
• Qualifying draw