| 2018 Gimcheon Open ATP Challenger | |
|---|---|
| Date | 7–13 May |
| Edition | 5th |
| Draw | 32S / 16D |
| Surface | Hard |
| Location | Gimcheon, South Korea |
| Champions | |
| Singles | |
 Yoshihito Nishioka | |
| Doubles | |
 Ruan Roelofse /  John-Patrick Smith | |
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.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| AUS | Matthew Ebden | 81 | 1 |
 CAN | Vasek Pospisil | 83 | 2 |
| AUS | Jordan Thompson | 94 | 3 |
 ISR | Dudi Sela | 97 | 4 |
 TPE | |||
 USA | Mackenzie McDonald | 146 | 6 |
| JPN | Go Soeda | 149 | 7 |
| TPE | Jason Jung | 154 | 8 |
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:
Yoshihito Nishioka def. Vasek Pospisil 6–4, 7–5. Ruan Roelofse / John-Patrick Smith def. Sanchai Ratiwatana / Sonchat Ratiwatana 6–2, 6–3.The 2012 Keio Challenger was a professional tennis tournament played on hard courts. It was the eighth edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Yokohama, Japan between 12 and 18 November 2012.
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