2018 Seoul Open Challenger – Singles

Thomas Fabbiano was the defending champion but chose not to defend his title.

Singles
2018 Seoul Open Challenger
Champion	Mackenzie McDonald
Runner-up	Jordan Thompson
Score	1–6, 6–4, 6–1

Main article: 2018 Seoul Open Challenger

Mackenzie McDonald won the title after defeating Jordan Thompson 1–6, 6–4, 6–1 in the final.

Seeds

1. Vasek Pospisil (second round)
2. Dudi Sela (first round)
3. Jordan Thompson (final)
4. Lu Yen-hsun (second round, retired)
5. Mackenzie McDonald (champion)
6. Go Soeda (second round)
7. Jason Jung (second round)
8. Tatsuma Ito (semifinals)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
		Jason Kubler	3	6	4
	3	Jordan Thompson	6	3	6
								3	Jordan Thompson	6	4	1
								5	Mackenzie McDonald	1	6	6
	5	Mackenzie McDonald	6	77
	8	Tatsuma Ito	4	64

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	V Pospisil	4	6	6
		B Schnur	6	1	3			1	V Pospisil	3	3
		J Kubler	6	6					J Kubler	6	6
		Ze Zhang	1	1												J Kubler	6	6
		S-w Kwon	6	1	6											S-w Kwon	3	4
		M Janvier	1	6	3				S-w Kwon	6	6
		M Giron	6	3	4			6	G Soeda	4	4
	6	G Soeda	1	6	6																		J Kubler	3	6	4
	3	J Thompson	6	6																		3	J Thompson	6	3	6
	WC	Kim Young-seok	1	2				3	J Thompson	7	711
		F Peliwo	7	3	1r			Q	J-h Son	5	69
	Q	Son Ji-hoon	5	6	3										3	J Thompson	6	6
	Q	Renta Tokuda	1	2												T-h Yang	1	3
		T-h Yang	6	6					T-h Yang	6	7
	Q	Makoto Ochi	4	0				7	J Jung	4	5
	7	J Jung	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	M McDonald	7	6
	WC	U-s Park	5	2				5	M McDonald	6	6
	SE	K Majchrzak	6	6				SE	K Majchrzak	3	4
		Y Takahashi	2	3											5	M McDonald	64	710	6
		L Harris	5	6	6											L Harris	77	68	3
	WC	Y-s Chung	7	3	0				L Harris	6	3
		M Banes	4	1				4	Y-h Lu	4	0r
	4	Y-h Lu	6	6																		5	M McDonald	6	77
	8	T Ito	6	6																		8	T Ito	4	64
		D-h Lee	1	3				8	T Ito	7	6
		Y Uchiyama	6	4	5			WC	S-c Hong	5	1
	WC	S-c Hong	2	6	7										8	T Ito	7	3	6
	Q	Yo Watanuki	6	6												D Wu	5	6	2
		D Kelly	3	4				Q	Yo Watanuki	4	5
		D Wu	6	2	6				D Wu	6	7
	2	D Sela	3	6	0

References

• Main Draw
• Qualifying Draw