Boys' singles
2021 US Open
Final
Champion	Daniel Rincón
Runner-up	Shang Juncheng
Score	6–2, 7–6(8–6)
Events
Singles men women boys girls Doubles men women mixed boys girls WC Singles men women quad WC Doubles men women quad Legends men women mixed
← 2019 · US Open · 2022 →

Jonáš Forejtek was the defending champion, having won the previous edition in 2019, but was no longer eligible to participate in junior events.

Daniel Rincón won the title, defeating Shang Juncheng in the final, 6–2, 7–6^(8–6).^[1]

All seeds received a bye into the second round.

Click on the seed number of a player to go to their draw section.

	Quarterfinals							Semifinals							Final
	1	Shang Juncheng	3	6	6
		Pierre Yves Bailly	6	3	2
								1	Shang Juncheng	6	6
								11	Sascha Gueymard Wayenburg	4	4
		Petr Nesterov	6	4	4
	11	Sascha Gueymard Wayenburg	0	6	6
															1	Shang Juncheng	2	66
															3	Daniel Rincón	6	78
	6	Victor Lilov	3	1
	3	Daniel Rincón	6	6
								3	Daniel Rincón	3	77	6
								8	Jérôme Kym	6	64	4
	8	Jérôme Kym	4	6	6
	2	Samir Banerjee	6	3	4

	First round							Second round							Third round							Quarterfinals
								1	J Shang	77	6
	WC	Aidan Mayo	6	6				WC	A Mayo	65	3
	Q	Miguel Gomes	3	3											1	J Shang	77	6
		Daniel Mérida Aguilar	77	6												D Mérida Aguilar	65	4
		Aleksander Orlikowski	64	3					D Mérida Aguilar	6	77
								13	D Blanch	3	62
																						1	J Shang	3	6	6
																							PY Bailly	6	3	2
								12	G Bueno	0	3
		Jack Anthrop	4	77	4				PY Bailly	6	6
		Pierre Yves Bailly	6	62	6											PY Bailly	6	6
	WC	Colton Smith	77	6											WC	C Smith	4	4
		Edas Butvilas	64	4				WC	C Smith	65	6	2
								5	J Pinnington Jones	77	4	0r

	First round							Second round							Third round							Quarterfinals
								4	B Kuzuhara	3	6	3
	Q	Jakub Menšík	6	6				Q	J Menšík	6	4	6
		Måns Dahlberg	4	2											Q	J Menšík	63	4
		Petr Nesterov	6	64	6											P Nesterov	77	6
	Q	Philip Florig	1	77	3				P Nesterov	6	6
								14	A Manzanera Pertusa	4	4
																							P Nesterov	6	4	4
																						11	S Gueymard Wayenburg	0	6	6
								11	S Gueymard Wayenburg	77	3	6
	WC	Ryan Colby	7	4	4			WC	R Colby	63	6	3
		Álvano Guillén Meza	5	6	0r										11	S Gueymard Wayenburg	7	77
		Ozan Colak	65	6	69										7	V Bielinskyi	5	63
		Abedallah Shelbayh	77	3	711				A Shelbayh	5	4
								7	V Bielinskyi	7	6

	First round							Second round							Third round							Quarterfinals
								6	V Lilov	77	4	6
	Q	Sebastian Dominko	4	6	3				P Sekulic	62	6	2
		Philip Sekulic	6	3	6										6	V Lilov	6	6
	Q	Christopher Li	6	4	65										9	M Lajal	2	2
	WC	Alexander Razeghi	4	6	77			WC	A Razeghi	2	6	3
								9	M Lajal	6	4	6
																						6	V Lilov	3	1
																						3	D Rincón	6	6
								16	A Bernard	6	77
		Max Westphal	6	6					M Westphal	3	65
		Peter Benjamín Privara	4	3											16	A Bernard	4	3
	WC	Aidan Kim	6	6											3	D Rincón	6	6
		Lui Maxted	2	4				WC	A Kim	64	5
								3	D Rincón	77	7

	First round							Second round							Third round							Quarterfinals
								8	J Kym	77	7
		Ignacio Buse	7	6					I Buse	63	5
	WC	Michael Zheng	5	3											8	J Kym	6	3	77
		Adolfo Daniel Vallejo	6	7												AD Vallejo	3	6	62
	Q	Kyle Kang	4	5					AD Vallejo	6	3	6
								10	S Cuenin	3	6	3
																						8	J Kym	4	6	6
																						2	S Banerjee	6	3	4
								15	M Kaśnikowski	4	6	77
		Mili Poljičak	6	2	1				E Quinn	6	0	64
		Ethan Quinn	2	6	6										15	M Kaśnikowski	7	2	2
		Max Hans Rehberg	4	6	77										2	S Banerjee	5	6	6
		Leo Borg	6	3	64				MH Rehberg	0	4
								2	S Banerjee	6	6

	First round							Qualifying competition
	1	Kalin Ivanovski	7	3	[3]
	WC	Nicholas Heng	5	6	[10]
								WC	Nicholas Heng	3	3r
								7	Philip Florig	6	4
		Derrick Chen	2	2
	7	Philip Florig	6	6

	First round							Qualifying competition
	2	Coleman Wong	7	7
	WC	Yu Tanaka	5	5
								2	Coleman Wong	1	6	[5]
								WC	Kyle Kang	6	3	[10]
	WC	Kyle Kang	7	4	[10]
	12	Elmer Møller	5	6	[6]

	First round							Qualifying competition
	3	Vilius Gaubas	6	6
		Azuma Visaya	3	4
								3	Vilius Gaubas	63	6	[3]
								10	Miguel Gomes	77	3	[10]
		Orel Kimhi	5	5
	10	Miguel Gomes	7	7

	First round							Qualifying competition
	4	Adam Jurajda	4	3
		Christopher Li	6	6
									Christopher Li	6	5	[10]
								9	João Victor Couto Loureiro	2	7	[7]
		Braden Shick	65	77	[3]
	9	João Victor Couto Loureiro	77	61	[10]

	First round							Qualifying competition
	5	Matthew William Donald	6	65	[10]
	WC	Sebastian Gorzny	1	77	[8]
								5	Matthew William Donald	6	1	[8]
								11	Sebastian Dominko	4	6	[10]
		Ezequiel Monferrer	3	4
	11	Sebastian Dominko	6	6

	First round							Qualifying competition
	6	Jakub Menšík	6	3	[10]
		Neo Niedner	1	6	[5]
								6	Jakub Menšík	6	710
									Benjamin Kittay	2	68
		Benjamin Kittay	6	2	[10]
	8	German Samofalov	4	6	[7]

• Draw