Doubles
2021 Open de Oeiras
Champions	Mats Moraing Oscar Otte
Runners-up	Riccardo Bonadio Denis Yevseyev
Score	6–1, 6–4

This was the first of four editions of the tournament in the 2021 ATP Challenger Tour calendar.^[1]

Mats Moraing and Oscar Otte won the title after defeating Riccardo Bonadio and Denis Yevseyev 6–1, 6–4 in the final.

Seeds

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

	First round							Quarterfinals							Semifinals							Final
	1	E Couacaud M Guinard	6	6
	WC	Pedro Araújo T Cação	0	3				1	E Couacaud M Guinard	3	6	[5]
	Alt	H Bourchier K Uchida	4	3					T Gabashvili C-h Tseng	6	2	[10]
		T Gabashvili C-h Tseng	6	6												T Gabashvili C-h Tseng	2	3
	3	E Benchetrit Z Kolář	6	77												R Bonadio D Yevseyev	6	6
	WC	F Cabral Luís Faria	3	65				3	E Benchetrit Z Kolář	77	3	[8]
		H Johnson Y Johnson	7	4	[3]				R Bonadio D Yevseyev	63	6	[10]
		R Bonadio D Yevseyev	5	6	[10]																		R Bonadio D Yevseyev	1	4
		A Collarini GM Moroni	4	4																			M Moraing O Otte	6	6
		M Moraing O Otte	6	6					M Moraing O Otte	6	6
		E Escobedo V Orlov	4	4				4	G Falcão G Oliveira	3	2
	4	Gonçalo Falcão G Oliveira	6	6												M Moraing O Otte	6	3	[10]
		L Miedler N Serdarušić	6	6												L Miedler N Serdarušić	4	6	[8]
	WC	Miguel Gomes H Rocha	3	1					L Miedler N Serdarušić	6	6
		P Kotov A Vatutin	6	6					P Kotov A Vatutin	4	4
	2	S Galdós S Martos Gornés	4	4

References

External links

• Main draw