Singles
2021 Rancho Santa Fe Open
Champion	Rebecca Peterson
Runner-up	Elvina Kalieva
Score	6–4, 6–0

You Xiaodi was the defending champion^[1] but chose not to participate.

Rebecca Peterson won the title, defeating Elvina Kalieva in the final, 6–4, 6–0.

Seeds

Draw

Finals

	Semifinals							Final
	1	Rebecca Peterson	6	6
	3	Madison Brengle	4	2
								1	Rebecca Peterson	6	6
								Q	Elvina Kalieva	4	0
	Q	Elvina Kalieva	4	6	3
	2	Fiona Ferro	6	4	0r

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	R Peterson	6	6
	WC	H Chang	1	0				1	R Peterson	6	6
		M Hibi	6	6					M Hibi	1	1
	Q	M Partaud	3	3											1	R Peterson	6	6
	Q	A Krueger	2	2												L Cabrera	4	1
	SE	E Bektas	6	6				SE	E Bektas	6	1	65
		L Cabrera	6	6					L Cabrera	4	6	77
	7	R Zarazúa	2	2																		1	R Peterson	6	6
	3	M Brengle	6	6																		3	M Brengle	4	2
	WC	A Kiick	0	2				3	M Brengle	6	6
		R Marino	6	6					R Marino	1	2
		M Inglis	4	3											3	M Brengle	4	6	6
		K Kozlova	7	6												K Kozlova	6	1	4
	Q	T Mihalíková	5	2					K Kozlova	2	6	6
	WC	K Day	3	6	6			WC	K Day	6	3	2
	5	M Doi	6	4	3

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	P Hercog	65	6	7
	WC	J Failla	77	3	5			8	P Hercog	6	6
	Q	E Douglas	77	3	6			Q	E Douglas	4	2
	Q	M Manasse	64	6	2										8	P Hercog	4	3
	Q	D Hewitt	5	6	2										Q	E Kalieva	6	6
	Q	E Kalieva	7	1	6			Q	E Kalieva	6	2	6
		L Küng	0	1				4	Z Diyas	4	6	2
	4	Z Diyas	6	6																		Q	E Kalieva	4	6	3
	6	K Kučová	4	6	6																	2	F Ferro	6	4	0r
	JE	E Jacquemot	6	4	2			6	K Kučová	1	77	77
	Q	H Giavara	5	0				PR	P Hon	6	64	64
	PR	P Hon	7	6											6	K Kučová	66	6	4
		K Kawa	1	4											2	F Ferro	78	3	6
		Ar Rodionova	6	6					Ar Rodionova	2	2
		C Dolehide	2	7	2			2	F Ferro	6	6
	2	F Ferro	6	5	6

References

• Main Draw