The 2018 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the fourth edition of the tournament and was part of the 2018 ATP Challenger Tour. It took place in Seoul, South Korea, between 30 April and 6 May 2018.
Tournament Details
| Attribute | Detail |
|---|---|
| Date | 30 April – 6 May 2018 |
| Edition | 4th |
| Surface | Outdoor hard courts |
| Location | Seoul, South Korea |
| Prize Money | Part of the ATP Challenger Tour |
Singles Main Draw – Seeds
| Seed | Country | Player | Ranking (23 Apr 2018) |
|---|---|---|---|
| 1 | CAN | Vasek Pospisil | 82 |
| 2 | ISR | Dudi Sela | 96 |
| 3 | AUS | Jordan Thompson | 98 |
| 4 | TPE | Lu Yen-hsun | 112 |
| 5 | USA | Mackenzie McDonald | 141 |
| 6 | JPN | Go Soeda | 145 |
| 7 | TPE | Jason Jung | 154 |
| 8 | JPN | Tatsuma Ito | 176 |
Wildcards into the singles main draw were awarded to Chung Yun-seong, Hong Seong-chan, Kim Young-seok, and Park Ui-sung. Kamil Majchrzak received entry as a special exempt. Qualifiers included Makoto Ochi, Son Ji-hoon, Renta Tokuda, and Yosuke Watanuki.
Champions
- Singles: Mackenzie McDonald (USA) def. Jordan Thompson (AUS) 1–6, 6–4, 6–1.
- Doubles: Toshihide Matsui (JPN) / Frederik Nielsen (DEN) def. Chen Ti (TPE) / Yi Chu-huan (TPE) 6–4, 7–6(7–3).
