The reigning U.S. Open champion Rory McIlroy and former PGA Championship winner Yang Yong-eun will headline the field this week at the Korea Open, organizers said Tuesday. The 54th edition of the South Korean national golf tournament will be held from Thursday to Sunday at the par-71 Woojeong Hills Country Club in Cheonan, about 90 kilometers south of Seoul. The winner will take home 300 million won (US$254,000).