Singles
2018 Open de Rennes
Champion	Vasek Pospisil
Runner-up	Ričardas Berankis
Score	6–1, 6–2

Uladzimir Ignatik was the defending champion but lost in the first round to Alexey Vatutin.

Vasek Pospisil won the title after defeating Ričardas Berankis 6–1, 6–2 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	7/Alt	Ričardas Berankis	7	6
		Liam Broady	5	1
								7/Alt	Ričardas Berankis	1	2
								2	Vasek Pospisil	6	6
	Q	Antoine Hoang	4	64
	2	Vasek Pospisil	6	77

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	M Youzhny	6	6
		C Moutet	1	2				1	M Youzhny	4	1
		G Sakharov	6	4	6				G Sakharov	6	6
	WC	U Humbert	3	6	3											G Sakharov	1	6	4
		S Bolelli	6	77											7/Alt	R Berankis	6	4	6
		S Ofner	2	61					S Bolelli	5	3
		M Bourgue	3	4				7/Alt	R Berankis	7	6
	7/Alt	R Berankis	6	6																		7/Alt	R Berankis	7	6
	3	G Elias	1	4																			L Broady	5	1
	WC	M Guinard	6	6				WC	M Guinard	3	6	6
	Q	M Ymer	77	5	2			WC	E Gulbis	6	3	4
	WC	E Gulbis	64	7	6										WC	M Guinard	4	4
	WC	M Janvier	77	6												L Broady	6	6
		T Robredo	65	4				WC	M Janvier	4	1
		L Broady	6	4	7				L Broady	6	6
	5	D Brown	3	6	5

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	N Gombos	6	6
		K de Schepper	2	3				8	N Gombos	2	6	3
		A De Greef	67	6	3			Q	A Hoang	6	4	6
	Q	A Hoang	79	3	6										Q	A Hoang	6	3	6
		N Milojević	77	2	4											Y Maden	3	6	2
		Y Maden	65	6	6				Y Maden	6	6
		E Ymer	6	3	6				E Ymer	4	4
	4	S Stakhovsky	1	6	3																	Q	A Hoang	4	64
	6	Q Halys	6	77																		2	V Pospisil	6	77
	Q	T Lamasine	1	65				6	Q Halys	4	6	710
		A Vatutin	6	6					A Vatutin	6	4	68
		U Ignatik	1	4											6	Q Halys	1	4
	SE	M Moraing	65	6	6										2	V Pospisil	6	6
		C Hemery	77	1	4			SE	M Moraing	64	60
	Q	Y Uchiyama	3	4				2	V Pospisil	77	77
	2	V Pospisil	6	6

References

• Main Draw
• Qualifying Draw