鄭在成
Lee Yong-dae (Hangul: 이용대; Hanja: 李龍大; ; born 11 September 1988) is a professional badminton player from South Korea who had been successful in both men's and mixed doubles. He reached world number 1 ranking with 4 different partners, Jung Jae-sung, Ko Sung-hyun and Yoo Yeon-seong in men's doubles, and Lee Hyo-jung in mixed doubles. He won a total of 43 Superseries titles, 37 in the men's doubles, the most of any doubles player in one discipline, and 6 in mixed doubles. He was ranked world number 1 in men's doubles for 117 consecutive weeks with his last partner, Yoo Yeon-seong.