The American sisters beat Andrea Hlavackova and Lucie Hradecka of the Czech Republic 6-4, 6-4 under the roof on a rainy afternoon at the All England Club. Venus closed out the match with a backhand volley winner after the Czechs saved a pair of match points.
On Saturday, Serena beat Maria Sharapova 6-0, 6-1 for the singles gold. She joined Steffi Graf as the only women to complete the Golden Slam—winning the Olympics and the four majors.
The American sisters, who also won doubles gold in Beijing and Sydney, took an hour and a half to wrap up their defeat of the number four seeds under the Centre Court roof.
The Czech pair saved two match points before Venus secured the victory with a backhand volley, hugging her sister in celebration as chants of “USA! USA!” rang out from the crowd.
Serena became tennis’ first double gold medalist at an Olympics since Venus won singles and doubles at the 2000 Sydney Games.
The Williams sisters didn’t drop a set through their five Olympic matches at Wimbledon.