Singles
2021 Engie Open Nantes Atlantique
Champion	Anhelina Kalinina
Runner-up	Océane Dodin
Score	7–6(7–4), 1–0, ret.

Cristina Bucșa was the defending champion^[1] but withdrew from the tournament.

Anhelina Kalinina won the title after Océane Dodin retired in the final at 7–6^(7–4), 1–0.

Seeds

Draw

Finals

	Semifinals							Final
	1	Anhelina Kalinina	77	78
	4	Martina Trevisan	63	66
								1	Anhelina Kalinina	77	1
								3	Océane Dodin	64	0r
	3	Océane Dodin	6	6
	7	Vitalia Diatchenko	2	3

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	A Kalinina	6	6
	PR	K Thandi	3	3				1	A Kalinina	6	6
	Q	E Andreeva	77	6				Q	E Andreeva	2	4
	WC	C Monnet	65	3											1	A Kalinina	6	6
	Q	R Șerban	6	65	4										Q	SB Grey	0	4
	Q	SB Grey	4	77	6			Q	SB Grey	6	6
		S Murray Sharan	4	0r				5	K Rakhimova	1	2
	5	K Rakhimova	6	0																		1	A Kalinina	77	78
	4	M Trevisan	6	6																		4	M Trevisan	63	66
	Q	S Cakarevic	0	3				4	M Trevisan	77	6
		D Snigur	6	4					D Snigur	64	4
	SE	S Waltert	3	1r											4	M Trevisan	6	3	6
	Q	İ Soylu	1r												WC	A Robbe	3	6	1
	WC	A Robbe	2					WC	A Robbe	6	3	6
	WC	A Albié	7	6				WC	A Albié	4	6	3
	8	Q Zheng	5	3

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	P Hercog	3	4
		U Radwańska	6	6					U Radwańska	3	4
		J Ponchet	2	4					L Pattinama Kerkhove	6	6
		L Pattinama Kerkhove	6	6												L Pattinama Kerkhove	66	3
	LL	E Yashina	2	5											3	O Dodin	78	6
	WC	M Noël	6	7				WC	M Noël	66	6	5
		C Paquet	4	77	64			3	O Dodin	78	4	7
	3	O Dodin	6	62	77																	3	O Dodin	6	6
	7	V Diatchenko	6	6																		7	V Diatchenko	2	3
		S Mendez	4	2				7	V Diatchenko	7	4	6
		A Raina	6	1	2			Q	S Nahimana	5	6	1
	Q	S Nahimana	4	6	6										7	V Diatchenko	6	3	6
	LL	D Marcinkēviča	0	5											2	V Gracheva	1	6	3
	Q	D Vismane	6	7				Q	D Vismane	6	5	4
	Q	E Bektas	5	5				2	V Gracheva	4	7	6
	2	V Gracheva	7	7

References

• Main Draw