2021 Porto Open – Singles

This was the first edition of the tournament.^[1]

Singles
2021 Porto Open
Champion	Altuğ Çelikbilek
Runner-up	Quentin Halys
Score	6–2, 6–1

Main article: 2021 Porto Open

Altuğ Çelikbilek won the title after defeating Quentin Halys 6–2, 6–1 in the final.

Seeds

1. Thiago Seyboth Wild (second round)
2. Prajnesh Gunneswaran (second round)
3. Emilio Gómez (semifinals)
4. Alejandro Tabilo (first round)
5. Frederico Ferreira Silva (second round, retired)
6. Go Soeda (first round)
7. Thanasi Kokkinakis (second round)
8. Denis Istomin (second 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

Finals

	Semifinals							Final
		Altuğ Çelikbilek	6	6
		Sergiy Stakhovsky	2	1
									Altuğ Çelikbilek	6	6
									Quentin Halys	2	1
	3	Emilio Gómez	4	4
		Quentin Halys	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	T Seyboth Wild	6	6
		R Olivo	4	2				1	T Seyboth Wild	65	3
		A Çelikbilek	6	65	6				A Çelikbilek	77	6
	Q	Yo Watanuki	3	77	3											A Çelikbilek	7	6
		T Ito	6	6												T Ito	5	3
	LL	Luís Faria	0	2					T Ito	6	1
		L Giustino	4	6	3			5	F Ferreira Silva	4	0r
	5	F Ferreira Silva	6	4	6																		A Çelikbilek	6	6
	4	A Tabilo	6	1	2																		S Stakhovsky	2	1
	Alt	P Polansky	1	6	6			Alt	P Polansky	63	4
	WC	G Oliveira	6	6				WC	G Oliveira	77	6
	WC	N Borges	1	2											WC	G Oliveira	62	65
		R Cid Subervi	1	1r												S Stakhovsky	77	77
	Alt	M Viola	6	4				Alt	M Viola	2	6	5
		S Stakhovsky	2	6	77				S Stakhovsky	6	4	7
	6	G Soeda	6	2	65

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	D Istomin	6	6
		G Andreozzi	4	3				8	D Istomin	5	4
	Q	S Verbeek	79	4	1			WC	G Elias	7	6
	WC	G Elias	67	6	6										WC	G Elias	3	64
	Q	G Blancaneaux	65	6	6										3	E Gómez	6	77
		J Domingues	77	2	4			Q	G Blancaneaux	1	79	1
	Alt	N Kuhn	5	2				3	E Gómez	6	67	6
	3	E Gómez	7	6																		3	E Gómez	4	4
	7	T Kokkinakis	77	6																			Q Halys	6	6
		R Marcora	63	1				7	T Kokkinakis	65	4
	Q	U Blanch	3	6	1				Q Halys	77	6
		Q Halys	6	3	6											Q Halys	6	6
		M Janvier	5	6	65											S Diez	3	0
		S Diez	7	2	77				S Diez	6	1	6
		M Bourgue	2	6	1			2	P Gunneswaran	3	6	4
	2	P Gunneswaran	6	3	6