The Williams sisters first won the doubles title at Sydney 2000, when Venus also won singles gold.
Earlier, China collected their second consecutive women's doubles medal when Yan Zi and Zheng Jie beat Ukrainian sisters Alona and Kateryna Bondarenko 6-2, 6-2 in the bronze medal play-off. Li Ting and Sun Tiantian won gold at Athens 2004.
Beijing 2008
Dementieva leads Russian sweep
17/08/2008 AT 10:35
Beijing 2008
Stunning Nadal wins Olympic gold
17/08/2008 AT 09:41
Beijing 2008
Federer strikes gold in Beijing
16/08/2008 AT 15:23