2021 İstanbul Cup – Singles

Singles
2021 İstanbul Cup
Champion	Sorana Cîrstea
Runner-up	Elise Mertens
Score	6–1, 7–6(7–3)
Draw	32 (6 Q / 4 WC)
Seeds	8

Sorana Cîrstea defeated Elise Mertens in the final, 6–1, 7–6^(7–3) to win the women's singles tennis title at the 2021 İstanbul Cup. This was Cîrstea's first title since 2008. Cîrstea did not drop a set throughout the tournament.^[1]

Patricia Maria Țig was the defending champion,^[2] but she chose not to participate this year.

	Semifinals							Final
	1/WC	Elise Mertens	6	6
	3	Veronika Kudermetova	1	4
								1/WC	Elise Mertens	1	63
									Sorana Cîrstea	6	77
		Marta Kostyuk	4	4
		Sorana Cîrstea	6	6

	First round							Second round							Quarterfinals							Semifinals
	1/WC	E Mertens	6	6
	Q	L Arruabarrena	2	0				1/WC	E Mertens	6	4	6
	Q	N Párrizas Díaz	4	6	3				V Golubic	4	6	1
		V Golubic	6	2	6										1/WC	E Mertens	6	6
		K Siniaková	77	3	6											K Siniaková	4	4
	Q	C Bucșa	65	6	3				K Siniaková	6	3	6
		K Mladenovic	6	6					K Mladenovic	4	6	4
	LL	B Haas	4	3																		1/WC	E Mertens	6	6
	3	V Kudermetova	6	3	77																	3	V Kudermetova	1	4
		B Pera	4	6	64			3	V Kudermetova	6	6
		Z Diyas	4	4					K Kanepi	4	3
		K Kanepi	6	6											3	V Kudermetova	2	6	6
		N Hibino	3	3												A Bogdan	6	3	3
		A Bogdan	6	6					A Bogdan	6	6
	WC	Ç Büyükakçay	710	2	0			5	B Krejčíková	3	3
	5	B Krejčíková	68	6	6

	First round							Second round							Quarterfinals							Semifinals
	8	Q Wang	4	6	6
	Q	A Gasanova	6	1	2			8	Q Wang	1	4
	WC	A Konjuh	7	6				WC	A Konjuh	6	6
		S Errani	5	2											WC	A Konjuh	5	6	3
	Q	K Rakhimova	4	3												M Kostyuk	7	4	6
		M Kostyuk	6	6					M Kostyuk	6	7
	Q	T Mrdeža	1	0				4	D Kasatkina	3	5
	4	D Kasatkina	6	6																			M Kostyuk	4	4
	6	A Pavlyuchenkova	62	710	4																		S Cîrstea	6	6
		A Potapova	77	68	6				A Potapova	66	4
		K Kozlova	4	66					S Cîrstea	78	6
		S Cîrstea	6	78												S Cîrstea	6	0
	WC	V Zvonareva	6	6												F Ferro	4	0r
		P Hercog	3	3				WC	V Zvonareva	3	3
		F Ferro	7	6					F Ferro	6	6
	2	P Martić	5	2

	First round							Qualifying competition
	1	Océane Dodin	63	6	0
		Tereza Mrdeža	77	3	6
									Tereza Mrdeža	6	6
									Irene Burillo Escorihuela	4	2
		Irene Burillo Escorihuela	6	6
	12	Liang En-shuo	1	4

	First round							Qualifying competition
	2	Kamilla Rakhimova	6	1	6
		Tessah Andrianjafitrimo	2	6	1
								2	Kamilla Rakhimova	6	6
								11	Mariam Bolkvadze	4	3
		Yuliya Hatouka	4	4
	11	Mariam Bolkvadze	6	6

	First round							Qualifying competition
	3	Jaqueline Cristian	6	6
		Pemra Özgen	4	3
								3	Jaqueline Cristian	1	3
								8	Cristina Bucșa	6	6
		Dalila Jakupović	1	2
	8	Cristina Bucșa	6	6

	First round							Qualifying competition
	4	Leonie Küng	3	6	3
	WC	Nikola Bartůňková	6	4	6
								WC	Nikola Bartůňková	4	7	3
								10	Anastasia Gasanova	6	5	6
		Irina Fetecău	2	3
	10	Anastasia Gasanova	6	6

	First round							Qualifying competition
	5	Barbara Haas	6	7
	WC	Zeynep Sönmez	3	5
								5	Barbara Haas	6	1	0
								7	Nuria Párrizas Díaz	2	6	6
	WC	İpek Öz	3	4
	7	Nuria Párrizas Díaz	6	6

	First round							Qualifying competition
	6	Harmony Tan	61	6	6
		Dalma Gálfi	77	3	1
								6	Harmony Tan	3	3
								9	Lara Arruabarrena	6	6
	WC	Berfu Cengiz	5	3
	9	Lara Arruabarrena	7	6

• Main Draw
• Qualifying Draw