2018 Gimcheon Open ATP Challenger

The 2018 Gimcheon Open ATP Challenger was a professional tennis tournament played on hard courts. It was the fifth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Gimcheon, Korea between 7 and 13 May 2018.

Seeds

 * 1 Rankings are as of 30 April 2018.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇰🇷 Chung Yun-seong
 * 🇰🇷 Lee Duck-hee
 * 🇰🇷 Lee Young-seok
 * 🇰🇷 Park Ui-sung

The following players received entry from the qualifying draw:
 * 🇯🇵 Yoshihito Nishioka
 * 🇯🇵 Makoto Ochi
 * 🇯🇵 Renta Tokuda
 * 🇹🇭 Wishaya Trongcharoenchaikul

The following player received entry as a lucky loser:
 * 🇦🇺 Luke Saville

Singles

 * 🇯🇵 Yoshihito Nishioka def. 🇨🇦 Vasek Pospisil 6–4, 7–5.

Doubles

 * Ruan Roelofse / 🇦🇺 John-Patrick Smith def. 🇹🇭 Sanchai Ratiwatana / 🇹🇭 Sonchat Ratiwatana 6–2, 6–3.