Claim: Liu Guoliang, a retired Chinese table tennis player who has won all titles at major world tournaments including World Championships, World Cup and Olympic Games who was appointed as the head coach of the China's National Men's Team at the age of 27, is the most successful coach in history with a team gold medal at the 2008 Summer Olympics.
Evidence: Liu Guoliang (simplified Chinese: 刘国梁; traditional Chinese: 劉國梁; pinyin: Liú Guóliáng; born January 10, 1976) is a retired Chinese table tennis player who has won all titles at major world tournaments including World Championships, World Cup and Olympic Games. Liu retired after the 2001 season and was appointed as the head coach of the China's National Men's Team at the age of 27. As the head coach of the Chinese Men's National Table Tennis Team he is the most successful coach in history with a team gold medal at the 2008 Summer Olympics in addition to the medal sweep by Ma Lin, Wang Hao, and Wang Liqin.