Singles
2018 Open Sopra Steria de Lyon
Final
Champion	Félix Auger-Aliassime
Runner-up	Johan Tatlot
Score	6–7(3–7), 7–5, 6–2
Events
Singles Doubles
← 2017 · Open Sopra Steria de Lyon · 2019 →

Félix Auger-Aliassime was the defending champion and successfully defended his title.

Auger-Aliassime won the title after defeating Johan Tatlot 6–7^(3–7), 7–5, 6–2 in the final.

	Semifinals							Final
		Miomir Kecmanović	2	66
		Félix Auger-Aliassime	6	78
									Félix Auger-Aliassime	63	7	6
								Q	Johan Tatlot	77	5	2
	Q	Johan Tatlot	77	6
	Q	Roberto Marcora	61	2

	First round							Second round							Quarterfinals							Semifinals
	1	R Carballés Baena	3	5
	Q	M Ymer	6	7				Q	M Ymer	2	67
		M Vilella Martínez	4	3					M Kecmanović	6	79
		M Kecmanović	6	6												M Kecmanović	7	2	6
	WC	A Popyrin	6	6											WC	A Popyrin	5	6	4
		V Šafránek	3	3				WC	A Popyrin	6	6
		M Bourgue	78	1	7				M Bourgue	4	4
	6	H Laaksonen	66	6	5																		M Kecmanović	2	66
	3	P Sousa	5	3																			F Auger-Aliassime	6	78
	WC	A Müller	7	6				WC	A Müller	2	7	6
		K de Schepper	7	2	3				J Domingues	6	5	4
		J Domingues	5	6	6										WC	A Müller	3	1
		J Hernández-Fernández	2	2												F Auger-Aliassime	6	6
		A Hoang	6	6					A Hoang	3	5
		F Auger-Aliassime	6	6					F Auger-Aliassime	6	7
	8/WC	C Moutet	2	2

	First round							Second round							Quarterfinals							Semifinals
	7	A Vatutin	1	3
		DE Galán	6	6					DE Galán	6	2	4
	WC	E Benchetrit	5	4				Q	J Tatlot	3	6	6
	Q	J Tatlot	7	6											Q	J Tatlot	1	77	6
		G Sakharov	1	1												A Pavlásek	6	63	3
		A Pavlásek	6	6					A Pavlásek	77	0	6
		R Quiroz	2	5				4	P Andújar	65	6	5r
	4	P Andújar	6	7																		Q	J Tatlot	77	6
	5	Q Halys	7	4	2																	Q	R Marcora	61	2
	Q	R Marcora	5	6	6			Q	R Marcora	6	77
		B Bonzi	6	6					B Bonzi	0	64
	Q	T Lamasine	3	4											Q	R Marcora	6	3	6
		M Krueger	6	1	6											C Garín	1	6	4
		P Martínez	4	6	0				M Krueger	6	3	5
		C Garín	6	6					C Garín	3	6	7
	2	G Melzer	3	3

• Main Draw
• Qualifying Draw