Lee Yong-dae 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.

Badminton is a racquet sport played using racquets to hit a shuttlecock across a net. Although it may be played with larger teams, the most common forms of the game are "singles" and "doubles". Badminton is often played as a casual outdoor activity in a yard or on a beach; formal games are played on a rectangular indoor court. Points are scored by striking the shuttlecock with the racquet and landing it within the other team's half of the court.