Zhang Jike beat compatriot Wang Hao 4-1 in an all-Chinese men''s singles table tennis final.
The 24-year-old won 18-16 11-5 11-6 10-12 13-11 as Wang suffered a third successive defeat in an Olympic final.
现年24岁的张继科以18-16 11-5 11-6 10-12 13-11的五局比分击败王皓。王皓已经连续三届奥运会获得乒乓球男子单打的亚军。
Zhang dominated as China took their second table tennis gold at London 2012 after Li Xiaoxia''s win over team-mate Ding Ning in the women''s final.
World champions Germany were crowned Olympic women''s team sprint gold winners in controversial circumstances following the relegation of China.
Guo Shuang and Gong Jinjie thought they had won gold when they finished in a time of 32.619 seconds compared to Germany''s 32.798.
But officials announced that China had been relegated for an overtake infringement, with Kristina Vogel and Miriam Welte awarded gold.
Ranomi Kromowidjojo claimed her first gold medal at London 2012 with victory in the women''s 100m freestyle.
The Dutch swimmer clocked an Olympic record of 53.00 seconds to finish ahead of Aliaksandra Herasimenia of Belarus, while China''s Tang Yi won bronze.
China''s NBA star Yi Jianlian suffered a knee injury during an 81-61 defeat to Australia in the men''s basketball.
The Dallas Mavericks player had to be helped off the court by team-mates as China slumped to their third defeat.