Ko Sung-hyun
He specializes in doubles events and was ranked as high as No. 2 worldwide with his former partner, Ko Sung-hyun. The two also competed at the 2012 Summer Olympics. For a long time he played mixed doubles with Kim Min-jung, but later switched partners to play with Jang Ye-na, starting in 2011. Starting in late 2013, his men's doubles partner was Lee Yong-dae. Together, they reached a world ranking of No.1 in August 2014.