| 2018 Seoul Open Challenger | |
|---|---|
| Date | 30 April – 6 May |
| Edition | 4th |
| Surface | Hard |
| Location | Seoul, South Korea |
| Champions | |
| Singles | |
 Mackenzie McDonald | |
| Doubles | |
 Toshihide Matsui /  Frederik Nielsen | |
The 2018 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the fourth edition of the tournament. It was part of the 2018 ATP Challenger Tour. It took place in Seoul, South Korea, between 30 April and 6 May 2018.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 CAN
|
Vasek Pospisil | 82 | 1 |
 ISR
|
Dudi Sela | 96 | 2 |
 AUS
|
Jordan Thompson | 98 | 3 |
 TPE
|
Lu Yen-hsun | 112 | 4 |
| USA
|
Mackenzie McDonald | 141 | 5 |
| JPN
|
Go Soeda | 145 | 6 |
| TPE
|
Jason Jung | 154 | 7 |
| JPN
|
Tatsuma Ito | 176 | 8 |
The following players received wildcards into the singles main draw:
Chung Yun-seong Hong Seong-chan Kim Young-seok Park Ui-sungThe following player received entry into the singles main draw as a special exempt:
The following players received entry from the qualifying draw:
Makoto Ochi Son Ji-hoon Renta Tokuda Yosuke Watanuki Mackenzie McDonald def. Jordan Thompson 1–6, 6–4, 6–1. Toshihide Matsui / Frederik Nielsen def. Chen Ti / Yi Chu-huan 6–4, 7–6(7–3).
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