The 2018 OEC Kaohsiung was a professional tennis tournament played on hard courts. It was the seventh edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Kaohsiung, Taiwan between 17 and 23 September 2018.
Singles main-draw entrants
Seeds
1 Rankings are as of 10 September 2018.
Other entrants
The following players received wildcards into the singles main draw: Ernests Gulbis Gaël Monfils Tseng Chun-hsin Wu Tung-lin
The following players received entry into the singles main draw as special exempts: Blaž Kavčič Li Zhe
The following players received entry from the qualifying draw: Chung Yun-seong Frederico Ferreira Silva Kwon Soon-woo Akira Santillan
The following player received entry as a lucky loser: Yūichi Sugita
Champions
Singles
Gaël Monfils def. Kwon Soon-woo 6–4, 2–6, 6–1.
Doubles
Hsieh Cheng-peng / Yang Tsung-hua def. Hsu Yu-hsiou / Jimmy Wang 6–7(3–7), 6–2, [10–8].