Singles
2021 Koser Jewelers Tennis Challenge
Champion	Nuria Párrizas Díaz
Runner-up	Greet Minnen
Score	7–6(8–6), 4–6, 7–6(9–7)

Madison Brengle was the defending champion, having won the previous edition in 2019,^[1] but lost in the second round to Lesley Pattinama Kerkhove.

Nuria Párrizas Díaz won the title, defeating Greet Minnen in the final, 7–6^(8–6), 4–6, 7–6^(9–7).

Seeds

Draw

Finals

	Semifinals							Final
		Lesley Pattinama Kerkhove	3	1
	4	Greet Minnen	6	6
								4	Greet Minnen	66	6	67
								3	Nuria Párrizas Díaz	78	4	79
	3	Nuria Párrizas Díaz	2	6	6
		Katarzyna Kawa	6	0	3

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	M Brengle	6	7
	WC	A Glatch	1	5				1	M Brengle	3	64
		L Cabrera	2	3					L Pattinama Kerkhove	6	77
		L Pattinama Kerkhove	6	6												L Pattinama Kerkhove	62	6	6
	Q	D Snigur	0r												Q	B Haddad Maia	77	4	1
	Q	B Haddad Maia	5					Q	B Haddad Maia	6	6
	LL	S Chang	77	7				LL	S Chang	4	4
	7	A Kalinskaya	65	5																			L Pattinama Kerkhove	3	1
	4	G Minnen	66	6	6																	4	G Minnen	6	6
		F Di Lorenzo	78	2	2			4	G Minnen	6	6
	Q	M Hontama	6	4				Q	M Hontama	3	2
	WC	D Lao	2	1r											4	G Minnen	7	6
		C Dolehide	4	4											8	C McNally	5	3
	Q	M Hibi	6	6				Q	M Hibi	4	62
	Q	A Sutjiadi	5	4				8	C McNally	6	77
	8	C McNally	7	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	Y Bonaventure	64	2
	Q	E Raducanu	77	6				Q	E Raducanu	3	6	6
	Q	E Gorgodze	63	6	1				E Gorgodze	6	0	1
		C Vandeweghe	77	3	0r										Q	E Raducanu	3r
	WC	G Min	6	5	77										3	N Párrizas Díaz	4
	PR	V Diatchenko	3	7	64			WC	G Min	2	6	1
	WC	J Loeb	62	2				3	N Párrizas Díaz	6	3	6
	3	N Párrizas Díaz	77	6																		3	N Párrizas Díaz	2	6	6
	Q	A Raina	6	6																			K Kawa	6	0	3
		R Zarazúa	3	2				Q	A Raina	3	77	4
		K Kawa	3	6	7				K Kawa	6	64	6
		L Küng	6	1	5											K Kawa	6	2	6
		M Fręch	6	6												M Fręch	4	6	2
		C Bucșa	2	3					M Fręch	710	0
		Ar Rodionova	1	2				2	C Tauson	68	0r
	2	C Tauson	6	6

References

• Main Draw