2021 Open de Oeiras IV – Singles

Singles
2021 Open de Oeiras IV
Champion	Gastão Elias
Runner-up	Holger Rune
Score	5–7, 6–4, 6–4

Main article: 2021 Open de Oeiras IV

Carlos Alcaraz was the defending champion but chose not to defend his title. Gastão Elias won the title after defeating Holger Rune 5–7, 6–4, 6–4 in the final.

Seeds

1. Mathias Bourgue (first round)
2. Wu Tung-lin (second round)
3. Julian Lenz (second round)
4. Tseng Chun-hsin (second round)
5. Roberto Quiroz (first round)
6. Carlos Gimeno Valero (quarterfinals)
7. Pedro Cachin (first round)
8. Riccardo Bonadio (second 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
		Gastão Elias	4	7	0
		Nuno Borges	6	5	0r
									Gastão Elias	5	6	6
									Holger Rune	7	4	4
		Holger Rune	6	3	6
	Q	Timofey Skatov	2	6	2

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	M Bourgue	2	2
	WC	Pedro Araújo	6	6				WC	P Araújo	5	0
		G Elias	6	6					G Elias	7	6
	WC	Luís Faria	2	3												G Elias	60	6	6
		C Ugo Carabelli	6	6												C Ugo Carabelli	77	3	0
		J de Jong	4	2					C Ugo Carabelli	4	7	6
		J Forejtek	64	6	0			8	R Bonadio	6	5	4
	8	R Bonadio	77	3	6																		G Elias	4	7	0
	4	C-h Tseng	6	6																			N Borges	6	5	0r
		R Ortega Olmedo	4	2				4	C-h Tseng	3	6	1
		J Härteis	3	0				Q	FC Jianu	6	3	6
	Q	FC Jianu	6	6											Q	FC Jianu	4	4
		N Serdarušić	4	5												N Borges	6	6
	Q	D Yevseyev	6	7				Q	D Yevseyev	77	4	2
		N Borges	6	6					N Borges	62	6	6
	5	R Quiroz	3	0

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	C Gimeno Valero	6	6
		V Sachko	2	1				6	C Gimeno Valero	6	6
	PR	V Galović	4	77	6			PR	V Galović	4	2
		D Ajduković	6	64	1										6	C Gimeno Valero	2	4
		H Rune	6	6												H Rune	6	6
		T van Rijthoven	3	4					H Rune	5	6	6
	Alt	C Denolly	4	0				3	J Lenz	7	4	3
	3	J Lenz	6	6																			H Rune	6	3	6
	7	P Cachin	4	7	61																	Q	T Skatov	2	6	2
		G Oliveira	6	5	77				G Oliveira	3	1
		I Sijsling	6	2	64			Q	T Skatov	6	6
	Q	T Skatov	2	6	77										Q	T Skatov	77	5	6
		G Blancaneaux	3	2											Q	N Sánchez Izquierdo	64	7	1
	Q	N Sánchez Izquierdo	6	6				Q	N Sánchez Izquierdo	6	77
	WC	T Cação	1	1				2	T-l Wu	2	62
	2	T-l Wu	6	6

External links

• Main draw
• Qualifying draw