Koo Kien Keat is a Malaysian former professional badminton player. He succeeded in both men's and mixed doubles but is best known for his partnership with Tan Boon Heong with whom, he reached a career high ranking of world number 1.

Markis Kido was an Indonesian badminton player and one of the world's leading in men's doubles discipline. He won the discipline's gold medal at the 2006 World Cup, 2007 World Championships, 2008 Olympic Games, 2009 Asia Championships, and 2010 Asian Games with Hendra Setiawan.