Girls' singles
2021 US Open
Final
Champion	Robin Montgomery
Runner-up	Kristina Dmitruk
Score	6–2, 6–4
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 →

Camila Osorio was the defending champion, having won the previous edition in 2019, but was no longer eligible to participate in junior events. She participated in the women's singles event, but lost to Ons Jabeur in the second round.

Robin Montgomery won the title, defeating Kristina Dmitruk in the final, 6–2, 6–4.^[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	Victoria Jiménez Kasintseva	3	2
	7	Robin Montgomery	6	6
								7	Robin Montgomery	2	6	6
									Solana Sierra	6	3	4
		Solana Sierra	4	6	77
	12	Elvina Kalieva	6	3	65
															7	Robin Montgomery	6	6
															6	Kristina Dmitruk	2	4
	6	Kristina Dmitruk	6	3	6
		Petra Marčinko	3	6	3
								6	Kristina Dmitruk	6	6
									Sebastianna Scilipoti	1	2
		Sebastianna Scilipoti	7	6
	2	Alex Eala	5	3

	First round							Second round							Third round							Quarterfinals
								1	V Jiménez Kasintseva	6	6
	Q	Theadora Rabman	7	6				Q	T Rabman	1	0
		Laura Hietaranta	5	2											1	V Jiménez Kasintseva	65	6	6
	WC	Liv Hovde	2	6	2											J Kolodynska	77	3	4
		Jana Kolodynska	6	1	6				J Kolodynska	6	0
								14	D Guzmán	2	0r
																						1	V Jiménez Kasintseva	3	2
																						7	R Montgomery	6	6
								9	N Szabanin	6	77
		Alina Shcherbinina	67	6	6				A Shcherbinina	4	65
	WC	Amelia Honer	79	4	4										9	N Szabanin	2	7	4
	Q	Annabelle Xu	6	6											7	R Montgomery	6	5	6
		Hanne Vandewinkel	0	3				Q	A Xu	2	0
								7	R Montgomery	6	6

	First round							Second round							Third round							Quarterfinals
								4	A Mintegi del Olmo	6	5	3
	WC	Sarah Hamner	3	1					S Sierra	4	7	6
		Solana Sierra	6	6												S Sierra	3	6	77
	WC	Tatum Evans	2	1											13	M Mutavdzic	6	4	64
	Q	Lucija Ćirić Bagarić	6	6				Q	L Ćirić Bagarić	3	1
								13	M Mutavdzic	6	6
																							S Sierra	4	6	77
																						12	E Kalieva	6	3	65
								12	E Kalieva	6	6
		Radka Zelníčková	3	1					R Brantmeier	3	3
		Reese Brantmeier	6	6											12	E Kalieva	77	6
		Clervie Ngounoue	6	6											5	L Fruhvirtová	63	4
		Julia Middendorf	3	3					C Ngounoue	0	2
								5	L Fruhvirtová	6	6

	First round							Second round							Third round							Quarterfinals
								6	K Dmitruk	6	65	6
		Johanne Svendsen	7	6					J Svendsen	3	77	2
	Q	Valencia Xu	5	2											6	K Dmitruk	6	6
		Linda Klimovičová	5	1											LL	K Wiersholm	4	1
	LL	Katja Wiersholm	7	6				LL	K Wiersholm	5	6	6
								11	M Guth	7	4	1
																						6	K Dmitruk	6	3	6
																							P Marčinko	3	6	3
								16	A Krueger	6	4	3
	Q	Yang Ya-yi	4	67					P Marčinko	3	6	6
		Petra Marčinko	6	79												P Marčinko	7	6
		Alexis Blokhina	78	6												A Blokhina	5	1
		Julia García	66	0					A Blokhina	6	77
								3	D Shnaider	2	65

	First round							Second round							Third round							Quarterfinals
								8	O Babel	4	77	3
		Sebastianna Scilipoti	6	1	6				S Scilipoti	6	60	6
	WC	Eleana Yu	3	6	4											S Scilipoti	78	77
		Sofia Costoulas	5													S Costoulas	66	65
		Sabina Zeynalova	4r						S Costoulas	6	3	6
								10	M Sieg	3	6	3
																							S Scilipoti	7	6
																						2	A Eala	5	3
								15	M Laki	6	6
		Bianca Behúlová	2	6	3				E Coleman	0	4
		Elizabeth Coleman	6	2	6										15	M Laki	6	5	4
	Q	Pimrada Jattavapornvanit	1	63											2	A Eala	4	7	6
	WC	Charlotte Owensby	6	77				WC	C Owensby	3	3
								2	A Eala	6	6

	First round							Qualifying competition
	1	Brenda Fruhvirtová	2	4
	WC	Ariana Pursoo	6	6
								WC	Ariana Pursoo	77	2	[11]
								10	Yang Ya-yi	64	6	[13]
		Clarine Lerby	3	4
	10	Yang Ya-yi	6	6

	First round							Qualifying competition
	2	Mirra Andreeva	6	6
		Qavia Lopez	0	1
								2	Mirra Andreeva	4	5
								7	Pimrada Jattavapornvanit	6	7
		Fatima Ingrid Amartha Keita	4	0
	7	Pimrada Jattavapornvanit	6	6

	First round							Qualifying competition
	3	Lucija Ćirić Bagarić	6	6
		Inès Bekrar	0	1
								3	Lucija Ćirić Bagarić	6	3	[10]
								12	Marina Stakusic	2	6	[7]
		Alexia Harmon	1	2
	12	Marina Stakusic	6	6

	First round							Qualifying competition
	4	Valencia Xu	6	6
		Tatyana Nikolenko	3	4
								4	Valencia Xu	6	77
									Mia Kupres	3	61
		Mia Kupres	4	6	[11]
	9	Erika Matsuda	6	3	[9]

	First round							Qualifying competition
	5	Annabelle Xu	6	6
		Kylie Bilchev	4	2
								5	Annabelle Xu	6	6
								WC	Katja Wiersholm	3	3
	WC	Katja Wiersholm	6	6
	8	Chelsea Fontenel	2	4

	First round							Qualifying competition
	6	Victoria Mboko	3	6	[4]
	WC	Theadora Rabman	6	2	[10]
								WC	Theadora Rabman	6	64	[10]
								11	Alejandra Cruz	1	77	[1]
	WC	Yuina Igarashi	1	2
	11	Alejandra Cruz	6	6

• Draw