Singles
2017 Seoul Open Challenger
Champion	Thomas Fabbiano
Runner-up	Kwon Soon-woo
Score	1–6, 6–4, 6–3

Sergiy Stakhovsky was the defending champion but chose not to defend his title.

Thomas Fabbiano won the title after defeating Kwon Soon-woo 1–6, 6–4, 6–3 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	8	Ruben Bemelmans	4	1
		Thomas Fabbiano	6	6
									Thomas Fabbiano	1	6	6
									Kwon Soon-woo	6	4	3
		Lee Duck-hee	3	0
		Kwon Soon-woo	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	Y-h Lu	3	4
	WC	Y-s Chung	6	6				WC	Y-s Chung	6	64	3
	SE	L Broady	3	4					H Moriya	4	77	6
		H Moriya	6	6												H Moriya	3	1
		A Santillan	7	4	3										8	R Bemelmans	6	6
	LL	L Saville	5	6	6			LL	L Saville	4	6	5
		B Klein	4	6	1			8	R Bemelmans	6	3	7
	8	R Bemelmans	6	3	6																	8	R Bemelmans	4	1
	4	K Kravchuk	4	3																			T Fabbiano	6	6
		G Soeda	6	6					G Soeda	6	6
	PR	A Ward	3	4				WC	Y-s Kim	2	4
	WC	Kim Young-seok	6	6												G Soeda	6	2	3
		O Jasika	4	78	61											T Fabbiano	3	6	6
		M Chiudinelli	6	66	77				M Chiudinelli	1	2
		T Fabbiano	6	6					T Fabbiano	6	6
	7	I Marchenko	2	4

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	V Pospisil	6	6
		S Doumbia	3	2				5	V Pospisil	6	63	66
		D-h Lee	6	6					D-h Lee	2	77	78
	Q	Shuichi Sekiguchi	0	3												D-h Lee	5	79	3
		S Bangoura	2	1											3	D Sela	7	67	0r
	Q	F Auger-Aliassime	6	6				Q	F Auger-Aliassime	3	1
	WC	Ho Chung	5	3				3	D Sela	6	6
	3	D Sela	7	6																			D-h Lee	3	0
	6	B Kavčič	64	3																			S-w Kwon	6	6
		S-w Kwon	77	6					S-w Kwon	77	6
		T Ito	2	3				Alt	M Tepavac	61	1
	Alt	M Tepavac	6	6												S-w Kwon	67	6	6
	Q	A Krajicek	716	6												A Sarkissian	79	4	3
	WC	S-c Hong	614	3				Q	A Krajicek	1	2
		A Sarkissian	6	6					A Sarkissian	6	6
	Q	D Nguyen	3	4

References

• Main Draw
• Qualifying Draw