Singles
2015 Open Harmonie mutuelle
Champion	Nicolas Mahut
Runner-up	Yūichi Sugita
Score	3–6, 7–6(7–3), 6–4

Andreas Beck was the defending champion, but lost in the second round.

Nicolas Mahut won the title, defeating Yūichi Sugita in the final, 3–6, 7–6^(7–3), 6–4.

Seeds

Draw

Finals

	Semifinals							Final
	1	Lucas Pouille	5	4
	3	Nicolas Mahut	7	6
								3	Nicolas Mahut	3	77	6
								5	Yūichi Sugita	6	63	4
	Q	Constant Lestienne	4	2
	5	Yūichi Sugita	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	L Pouille	7	3	77
	WC	Q Halys	5	6	64			1	L Pouille	6	3	6
		G Gigounon	64	2					M Michalička	4	6	3
		M Michalička	77	6											1	L Pouille	6	6
		Y Uchiyama	1	3												N Mektić	2	4
		N Mektić	6	6					N Mektić	4	6	6
		J Mertl	7	62	6				J Mertl	6	3	4
	8	E Corrie	5	7	3																	1	L Pouille	5	4
	3	N Mahut	6	77																		3	N Mahut	7	6
	Q	R Becker	4	65				3	N Mahut	6	6
		P Krstin	1	2					Y Marti	3	0
		Y Marti	6	6											3	N Mahut	77	5	77
		Jules Marie	6	6												R Boutillier	62	7	65
		J Cagnina	2	3					J Marie	4	2
		R Boutillier	6	3	77				R Boutillier	6	6
	7	D Guez	2	6	61

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	J Hernych	6	6
	WC	G Burquier	4	4				6	J Hernych	6	4	1
	Q	C Lestienne	6	3	6			Q	C Lestienne	4	6	6
	WC	G Barrère	2	6	3										Q	C Lestienne	6	6
		M Vaïsse	4	2												V Millot	1	4
		V Millot	6	6					V Millot	7	6
		U Ignatik	2	6	6				U Ignatik	5	1
	4	I Sijsling	6	4	4																	Q	C Lestienne	4	2
	5	Y Sugita	6	3																		5	Y Sugita	6	6
	Q	M Willis	4	0r				5	Y Sugita	6	6
	Q	H Nys	4	5					Y Mertens	0	3
		Y Mertens	6	7											5	Y Sugita	5
		F Nielsen	3	65												J Huta Galung	3r
		J Huta Galung	6	77					J Huta Galung	6	6
	WC	Laurent Rochette	1	77	5			2	A Beck	3	4
	2	A Beck	6	62	7

References

• Main Draw
• Qualifying Draw