2021 Open de Oeiras – Singles

This was the first of four editions of the tournament in the 2021 ATP Challenger Tour calendar.

Singles
2021 Open de Oeiras
Champion	Zdeněk Kolář
Runner-up	Gastão Elias
Score	6–4, 7–5

Main article: 2021 Open de Oeiras

Zdeněk Kolář won the title after defeating Gastão Elias 6–4, 7–5 in the final.

Seeds

1. Oscar Otte (first round)
2. Enzo Couacaud (first round)
3. Ramkumar Ramanathan (withdrew)
4. Ernesto Escobedo (first round)
5. Andrea Collarini (first round)
6. Elliot Benchetrit (first round)
7. Gian Marco Moroni (second round)
8. Zdeněk Kolář (champion)

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
		Marco Trungelliti	3	2
	8	Zdeněk Kolář	6	6
								8	Zdeněk Kolář	6	7
								WC	Gastão Elias	4	5
	WC	Gastão Elias	6	7
	Q	Evan Furness	3	5

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	O Otte	3	4
		M Trungelliti	6	6					M Trungelliti	6	6
		G Oliveira	6	6					G Oliveira	1	3
	Q	D Yevseyev	1	2												M Trungelliti	6	6
	Q	M Guinard	1	5												I Sijsling	3	4
		I Sijsling	6	7					I Sijsling	6	6
		A Vatutin	4	3				7	GM Moroni	2	2
	7	GM Moroni	6	6																			M Trungelliti	3	2
	LL	F Cabral	2	77	2																	8	Z Kolář	6	6
		M Moraing	6	65	6				M Moraing	6	2	5
		D-h Lee	3	4				WC	T Cação	4	6	7
	WC	T Cação	6	6											WC	T Cação	3	2
	Alt	H Bourchier	5	4											8	Z Kolář	6	6
		L Miedler	7	6					L Miedler	1	1
	WC	N Borges	6	66	1			8	Z Kolář	6	6
	8	Z Kolář	2	78	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	A Collarini	6	3	5
		A Molčan	3	6	7				A Molčan	6	6
		N Serdarušić	6	6					N Serdarušić	4	2
	LL	Luís Faria	3	3												A Molčan	2	5
		C-h Tseng	3	6	4										WC	G Elias	6	7
	WC	G Elias	6	2	6			WC	G Elias	3	6	6
		R Ortega Olmedo	7	6					R Ortega Olmedo	6	1	3
	4	E Escobedo	5	4																		WC	G Elias	6	7
	6	E Benchetrit	3	1																		Q	E Furness	3	5
	Q	R Brancaccio	6	6				Q	R Brancaccio	6	6
		N Kuhn	6	6					N Kuhn	1	2
		T Gabashvili	3	3											Q	R Brancaccio	1	6	4
		K Uchida	6	4	63										Q	E Furness	6	1	6
		R Bonadio	3	6	77				R Bonadio	6	3	4
	Q	E Furness	6	3	77			Q	E Furness	4	6	6
	2	E Couacaud	4	6	64

External links

• Main draw
• Qualifying draw