Joo Sae-hyuk is a South Korean table tennis player. As a singles player, he was a silver medalist at the 2003 World Table Tennis Championships, a bronze medalist at the 2011 Table Tennis World Cup, and a bronze medalist at the 2010 and 2014 Asian Games. In the team event, as a member of the South Korean National Team, he was a silver medalist in the 2002, 2006, 2010, and 2014 Asian Games; the 2006 and 2008 World Championships; and the 2012 Summer Olympics.

Table tennis is a racket sport derived from tennis but distinguished by its playing surface being atop a stationary table, rather than the court on which players stand. Either individually or in teams of two, players take alternating turns returning a light, hollow ball over the table's net onto the opposing half of the court using small rackets until they fail to do so, which results in a point for the opponent. Play is fast, requiring quick reaction and constant attention, and is characterized by an emphasis on spin relative to other ball sports, which can heavily affect the ball's trajectory.