2021 Open de Oeiras II – Singles

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

Singles
2021 Open de Oeiras II
Champion	Pedro Cachin
Runner-up	Nuno Borges
Score	7–6(7–4), 7–6(7–3)

Main article: 2021 Open de Oeiras II

Zdeněk Kolář was the defending champion but chose not to defend his title.

Pedro Cachin won the title after defeating Nuno Borges 7–6^(7–4), 7–6^(7–3) in the final.

Seeds

1. Oscar Otte (second round)
2. Enzo Couacaud (first round)
3. Ernesto Escobedo (second round)
4. Elliot Benchetrit (first round)
5. Gian Marco Moroni (quarterfinals)
6. Marco Trungelliti (first round)
7. Nicola Kuhn (first round)
8. Tristan Lamasine (first round)

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
		Gonçalo Oliveira	64	0r
	Q	Pedro Cachin	77	4
								Q	Pedro Cachin	77	77
								WC	Nuno Borges	64	63
	SE	Gastão Elias	6	2	3
	WC	Nuno Borges	4	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	O Otte	6	6
	WC	Pedro Araújo	2	4				1	O Otte	4	6	3
		R Bonadio	64	5					G Oliveira	6	4	6
		G Oliveira	77	7												G Oliveira	7	6
		M Zverev	4												WC	T Cação	5	2
		M Moraing	3r						M Zverev	3	6	66
	WC	T Cação	6	6				WC	T Cação	6	1	78
	8	T Lamasine	2	4																			G Oliveira	64	0r
	4	E Benchetrit	2	1																		Q	P Cachin	77	4
	Q	P Cachin	6	6				Q	P Cachin	6	6
		C-h Tseng	6	65	3			Q	A Andreev	2	4
	Q	A Andreev	1	77	6										Q	P Cachin	6	2	6
		P Kotov	6	3											5	GM Moroni	3	6	4
	Alt	H Bourchier	0	0r					P Kotov	2	2
		A Molčan	2	4				5	GM Moroni	6	6
	5	GM Moroni	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	M Trungelliti	1	4
	SE	G Elias	6	6				SE	G Elias	6	6
		C Gimeno Valero	6	6					C Gimeno Valero	1	3
		R Ortega Olmedo	1	1											SE	G Elias	w/o
		D Kuzmanov	6	6												D Kuzmanov
		L Miedler	1	0					D Kuzmanov	6	6
	Q	E Furness	3	2				3	E Escobedo	2	2
	3	E Escobedo	6	6																		SE	G Elias	6	2	3
	7	N Kuhn	1	4																		WC	N Borges	4	6	6
		M Guinard	6	6					M Guinard	6	6
		H Grenier	6	6					H Grenier	4	1
		D-h Lee	0	3												M Guinard	3	6	3
	Alt	J Forejtek	3r												WC	N Borges	6	3	6
	Q	R Brancaccio	4					Q	R Brancaccio	4	6	3
	WC	N Borges	6	6				WC	N Borges	6	4	6
	2	E Couacaud	3	4

External links

• Main draw
• Qualifying draw