Singles
2021 Open de Rennes
Champion	Benjamin Bonzi
Runner-up	Mats Moraing
Score	7–6(7–3), 7–6(7–3)

Arthur Rinderknech was the defending champion^[1] but lost in the semifinals to Benjamin Bonzi.

Bonzi won the title after defeating Mats Moraing 7–6^(7–3), 7–6^(7–3) in the final.

Seeds

Draw

Finals

	Semifinals							Final
	1	Richard Gasquet	4	7	2
		Mats Moraing	6	5	6
									Mats Moraing	63	63
								3	Benjamin Bonzi	77	77
	3	Benjamin Bonzi	69	77	6
	2	Arthur Rinderknech	711	64	1

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	R Gasquet	77	6
	WC	K Jacquet	64	3				1	R Gasquet	6	6
		B Schnur	4	4				Q	C Chidekh	1	4
	Q	C Chidekh	6	6											1	R Gasquet	78	7
	Q	M Guinard	4	3												R Safiullin	66	5
		R Safiullin	6	6					R Safiullin	6	4	6
		Y Maden	3	1				5/WC	A Murray	2	6	1
	5/WC	A Murray	6	6																		1	R Gasquet	4	7	2
	4	G Simon	3	2																			M Moraing	6	5	6
	Alt	T Gabashvili	6	6				Alt	T Gabashvili	4	6	6
		E Escobedo	7	6					E Escobedo	6	2	3
		C Lestienne	5	1											Alt	T Gabashvili	2	63
		M Moraing	4	7	6											M Moraing	6	77
	WC	H Mayot	6	5	2				M Moraing	711	6
	Q	C Hemery	1	1				8	T Macháč	69	1
	8	T Macháč	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	7	G Barrère	79	7
		T van Rijthoven	67	5				7	G Barrère	67	6	4
	Q	A Bega	2	1					L Broady	79	4	6
		L Broady	6	6												L Broady	4	2
		K Żuk	7	6											3	B Bonzi	6	6
	LL	M Rosenkranz	5	3					K Żuk	63	3
		E Ymer	3	4				3	B Bonzi	77	6
	3	B Bonzi	6	6																		3	B Bonzi	69	77	6
	6	L Pouille	5	6	6																	2	A Rinderknech	711	64	1
		M Janvier	7	4	3			6	L Pouille	3	6	6
	LL	D Added	3	4					A Hoang	6	3	4
		A Hoang	6	6											6	L Pouille	3	63
		G Soeda	64	4											2	A Rinderknech	6	77
		T Lamasine	77	6					T Lamasine	68	2
		T Kamke	3	6	3			2	A Rinderknech	710	6
	2	A Rinderknech	6	3	6

References

External links

• Main draw
• Qualifying draw