Men's singles
2018 Challenger Banque Nationale de Gatineau
Final
Champion	Bradley Klahn
Runner-up	Ugo Humbert
Score	6–3, 7–6(7–5)
Events
Singles men women Doubles men women
← 2017 · Challenger de Gatineau · 2019 →

Denis Shapovalov was the defending champion but chose not to defend his title.

Bradley Klahn won the title after defeating Ugo Humbert 6–3, 7–6^(7–5) in the final.

	Semifinals							Final
		Ugo Humbert	6	6
	7	Go Soeda	4	1
									Ugo Humbert	3	65
								5	Bradley Klahn	6	77
	5	Bradley Klahn	6	6
	2	Jason Kubler	2	3

	First round							Second round							Quarterfinals							Semifinals
	1	P Polansky	77	67	7
	Q	R Rodríguez	65	79	5			1	P Polansky	6	7
	WC	Pavel Krainik	4	6	6			WC	P Krainik	2	5
	WC	Samuel Monette	6	4	4										1	P Polansky	77	63	64
		B Schnur	3	1												U Humbert	64	77	77
		U Humbert	6	6					U Humbert	6	6
	WC	B Sigouin	6	6				WC	B Sigouin	4	4
	6	L Broady	4	2																			U Humbert	6	6
	4	T Ito	77	3	5																	7	G Soeda	4	1
		M Neuchrist	62	6	7				M Neuchrist	1
		Renta Tokuda	6	61	6				R Tokuda	1r
	Q	E Leshem	4	77	3											M Neuchrist	63	3
	Q	Jacob Grills	6	77											7	G Soeda	77	6
		A Sarkissian	3	63				Q	J Grills	6	1	4
		Y Takahashi	4	3				7	G Soeda	2	6	6
	7	G Soeda	6	6

	First round							Second round							Quarterfinals							Semifinals
	5	B Klahn	7	77
		B Mousley	5	63				5	B Klahn	7	6
	Q	Y-s Chung	77	6				Q	Y-s Chung	5	4
		M Krueger	63	4											5	B Klahn	67	6	6
		A Ward	4	63												Z Li	79	4	3
		Z Li	6	77					Z Li	2	6	6
	WC	A Galarneau	65	5				3	D King	6	4	0
	3	D King	77	7																		5	B Klahn	6	6
	8	F Peliwo	6	4	5																	2	J Kubler	2	3
		E Escobedo	3	6	7				E Escobedo	6	3	77
		J Menezes	6	6					J Menezes	2	6	65
		L Miedler	3	3												E Escobedo	64	77	3
		L Grigelis	6	7											2	J Kubler	77	63	6
		S Napolitano	2	5					L Grigelis	65	6	4
		K Uchida	1	2				2	J Kubler	77	4	6
	2	J Kubler	6	6

• Main Draw
• Qualifying Draw