2021 Open de Oeiras IV – Doubles

Hunter Reese and Sem Verbeek were the defending champions^[1] but chose not to defend their title.

Doubles
2021 Open de Oeiras IV
Champions	Jesper de Jong Tim van Rijthoven
Runners-up	Julian Lenz Roberto Quiroz
Score	6–1, 7–6(7–3)

Main article: 2021 Open de Oeiras IV

Jesper de Jong and Tim van Rijthoven won the title after defeating Julian Lenz and Roberto Quiroz 6–1, 7–6^(7–3) in the final.

Seeds

1. Evan King / Gonçalo Oliveira (quarterfinals)
2. Sadio Doumbia / Fabien Reboul (first round)
3. Dustin Brown / Tristan-Samuel Weissborn (quarterfinals)
4. Karol Drzewiecki / Sergio Martos Gornés (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

	First round							Quarterfinals							Semifinals							Final
	1	E King G Oliveira	5	78	[10]
		R Ortega Olmedo D Yevseyev	7	66	[7]			1	E King G Oliveira	6	1	[7]
		P Cachin C Ugo Carabelli	6	6					P Cachin C Ugo Carabelli	4	6	[10]
		M Bortolotti V Galović	3	2												P Cachin C Ugo Carabelli	4	4
	3	D Brown T-S Weissborn	6	6												J de Jong T van Rijthoven	6	6
		S Galdós F Zeballos	4	1				3	D Brown T-S Weissborn	6	1	[10]
		J de Jong T van Rijthoven	6	6					J de Jong T van Rijthoven	4	6	[12]
		C-h Tseng T-l Wu	2	1																			J de Jong T van Rijthoven	6	77
		R Bonadio N Serdarušić	6	3	[11]																		J Lenz R Quiroz	1	63
	WC	Gonçalo Falcão Luís Faria	3	6	[9]				R Bonadio N Serdarušić	2	2
	WC	N Borges F Cabral	77	66	[11]			WC	N Borges F Cabral	6	6
	4	K Drzewiecki S Martos Gornés	64	78	[9]										WC	N Borges F Cabral	65	2
		J Cerretani VV Cornea	6	4	[4]											J Lenz R Quiroz	77	6
	WC	Pedro Araújo Fábio Coelho	4	6	[10]			WC	P Araújo F Coelho	5	7	[9]
		J Lenz R Quiroz	2	77	[10]				J Lenz R Quiroz	7	5	[11]
	2	S Doumbia F Reboul	6	65	[3]