2017 Seoul Open Challenger

Country	Player	Rank1	Seed
TPE	Lu Yen-hsun	56	1
KOR	Chung Hyeon	78	2
ISR	Dudi Sela	99	3
RUS	Konstantin Kravchuk	105	4
CAN	Vasek Pospisil	111	5
SLO	Blaž Kavčič	123	6
UKR	Illya Marchenko	125	7
BEL	Ruben Bemelmans	132	8

• ¹ Rankings as of 1 May 2017.^[1]

The following players received wildcards into the singles main draw:

• Chung Hong
• Chung Yun-seong
• Hong Seong-chan
• Kim Young-seok

The following player received entry into the singles main draw as an alternate:

• Marko Tepavac

The following player received entry into the singles main draw as a special exempt:

• Liam Broady

The following player received entry into the singles main draw using a protected ranking:

• Alexander Ward

The following players received entry from the qualifying draw:

• Félix Auger-Aliassime
• Austin Krajicek
• Daniel Nguyen
• Shuichi Sekiguchi

The following player received entry as a lucky loser:

• Luke Saville

• Thomas Fabbiano def. Kwon Soon-woo 1–6, 6–4, 6–3.

• Hsieh Cheng-peng / Peng Hsien-yin def. Thomas Fabbiano / Dudi Sela 5–1 ret.