2017 Seoul Open Challenger

The 2017 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the third edition of the tournament. It was part of the 2017 ATP Challenger Tour. It took place in Seoul, South Korea, on 8–14 May 2017.

Seeds

 * 1 Rankings as of 1 May 2017.

Other entrants
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

Singles

 * 🇮🇹 Thomas Fabbiano def. 🇰🇷 Kwon Soon-woo 1–6, 6–4, 6–3.

Doubles

 * Hsieh Cheng-peng / Peng Hsien-yin def. 🇮🇹 Thomas Fabbiano / 🇮🇱 Dudi Sela 5–1 ret.