Table:
text: List of U.S. Open Badminton champions
Past winners
Past winners
Year_ Men_s_singles Women_s_singles Men_s_doubles Women_s_doubles Mixed_doubles
1984 Xiong Guobao Luo Yun Chen Hongyong Zhang Qingwu Yin Haichen Lu Yanahua Wang Pengren Luo Yun
1985 Mike Butler Claire Backhouse Sharpe John Britton Gary Higgins Claire Sharpe Sandra Skillings Mike Butler Claire Sharpe
1986 Sung Han-kuk Denyse Julien Yao Ximing Tariq Wadood Denyse Julien Johanne Falardeau Mike Butler Johanne Falardeau
1987 Park Sun-bae Chun Suk-sun Lee Deuk-choon Lee Sang-bok Kim Ho Ja Chung So-young Lee Deuk-choon Chung So-young
1988 Sze Yu Lee Myeong-hee Christian Hadinata Lius Pongoh Kim Ho Ja Chung So-young Christian Hadinata Ivana Lie
1989 no competition no competition no competition no competition no competition
1990 Fung Permadi Denyse Julien Ger Shin-Ming Yang Shih-Jeng Denyse Julien Doris Piché Tariq Wadood Traci Britton

Question: Who was the singles champion in the 1984 US Open badminton champions list?