Singles
2018 Gimcheon Open ATP Challenger
Final
Champion	Yoshihito Nishioka
Runner-up	Vasek Pospisil
Score	6–4, 7–5
Events
Singles Doubles
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Thomas Fabbiano was the defending champion but chose not to defend his title.

Yoshihito Nishioka won the title after defeating Vasek Pospisil 6–4, 7–5 in the final.

	Semifinals							Final
		Max Purcell	4	0
	Q	Yoshihito Nishioka	6	6
								Q	Yoshihito Nishioka	6	7
								2	Vasek Pospisil	4	5
		Kwon Soon-woo	1	2
	2	Vasek Pospisil	6	6

	First round							Second round							Quarterfinals							Semifinals
	1	M Ebden	77	1	0r
		Z Li	65	6	3				Z Li	1	4
		B Schnur	78	1	3				M Purcell	6	6
		M Purcell	66	6	6											M Purcell	6	6
	WC	U-s Park	5	2											7	G Soeda	3	3
		Y Takahashi	7	6					Y Takahashi	63	2
		R Statham	2	6	4			7	G Soeda	77	6
	7	G Soeda	6	3	6																		M Purcell	4	0
	3	J Thompson	6	6																		Q	Y Nishioka	6	6
	WC	Y-s Chung	4	1				3	J Thompson	2	4
	Q	Y Nishioka	6	6				Q	Y Nishioka	6	6
		J-P Smith	4	0											Q	Y Nishioka	6	6
	WC	Lee Young-seok	1	1											Q	M Ochi	2	2
	Q	Makoto Ochi	6	6				Q	M Ochi	4	6	77
	WC	D-h Lee	77	2	3			LL	L Saville	6	1	61
	LL	L Saville	63	6	6

	First round							Second round							Quarterfinals							Semifinals
	6	M McDonald	77	77
		Ze Zhang	64	65				6	M McDonald	4	6	6
		F Peliwo	6	6					F Peliwo	6	3	1
		D Wu	4	1											6	M McDonald	5	5
		S-w Kwon	6	2	6											S-w Kwon	7	7
		D Kelly	4	6	2				S-w Kwon	4	6	6
		M Banes	3	2				4	D Sela	6	3	1
	4	D Sela	6	6																			S-w Kwon	1	2
	8	J Jung	6	5	77																	2	V Pospisil	6	6
		T Ito	3	7	64			8	J Jung	66	0
	Q	Renta Tokuda	6	7				Q	R Tokuda	78	6
	Q	W Trongcharoenchaikul	1	5											Q	R Tokuda	4	4
		J Kubler	6	6											2	V Pospisil	6	6
		M Giron	4	2					J Kubler	4	4
		Y Uchiyama	77	2	2			2	V Pospisil	6	6
	2	V Pospisil	65	6	6

• Main Draw
• Qualifying Draw