Zhou Di (R) of China fights against Harnouf Said of Morocco during their men's 75kg match at the World Series of Boxing (WSB), in Sanya, South China's Hainan Province, February 13, 2015. China won with 4-1 in total. (Xinhua/Guo Cheng)

Zhou Di (L) of China fights against Harnouf Said of Morocco during their men's 75kg match at the World Series of Boxing (WSB), in Sanya, South China's Hainan Province, February 13, 2015. China won with 4-1 in total. (Xinhua/Guo Cheng)

Guo Jin (L) of China fights against Subacius Vitalijus of Morocco during their men's 91kg match at the World Series of Boxing (WSB), in Sanya, South China's Hainan Province, February 13, 2015. China won with 4-1 in total. (Xinhua/Guo Cheng)

Zhou Di (R) of China fights against Harnouf Said of Morocco during their men's 75kg match at the World Series of Boxing (WSB), in Sanya, South China's Hainan Province, February 13, 2015. China won with 4-1 in total. (Xinhua/Guo Cheng)

Diao Jianhao (L) of China celebrates victory after his match against Hamout Mohamed of Morocco during the men's 56kg match at the World Series of Boxing (WSB), in Sanya, South China's Hainan Province, February 13, 2015. China won with 4-1 in total. (Xinhua/Guo Cheng)