Malaysian shuttler Lee Chong Wei's Korean Open campaign ended in early disappointment as he was beaten by Heo Kwang Hee in his qualifying match on Tuesday.
For Chong Wei, the 21-19, 21-19 loss will be a bitter pill to swallow as he had looked to bounce back from his second-round defeat to Lin Dan at last week's Japan Open.
The loss to Heo marks Chong Wei's earliest exit from a tournament since making his comeback from an eight-month doping ban in May, and also dents his chances of qualifying for the 2016 Olympic Games in Rio de Janeiro.
The Badminton Association of Malaysia (BAM) had sent national coach Tey Seu Bock to help Chong Wei during the tournament, but it proved to be an unnecessary move as the former world number one crashed out before making it to the main draw.
Chong Wei was not the only major casualty as fourth seed Kenichi Tago was beaten 21-19, 21-17 by Ihsan Maulana Mustofa in his qualifying match.
Meanwhile, third seed Zulfadli Zulkiffli defeated Sattawat Pongnairat 21-10, 21-8 and Kazumasa Sakai 13-21, 21-8, 21-17 to reach the main draw, where he will face Indonesia's Tommy Sugiarto in the first round on Wednesday.