Serena Williams of the United States was in a state of shock after clinching gold with an emphatic victory over Maria Sharapova.
The reigning Wimbledon champion made short work of her Russian opponent at SW19, sealing a 6-0 6-1 triumph in 63 minutes to win the women's singles gold medal at London 2012.
It was the most comprehensive women's singles final win in Olympic history.
French Open champion Sharapova takes home the silver medal, while world number one Victoria Azarenka of Belarus claimed bronze by beating Russia's Maria Kirilenko.
"Oh my gosh - I got the gold. I've never played better," she said. "Playing against someone like Maria you have to be at your best. I knew that, so it was like I had nothing to lose.
"I never expected gold in singles. I was so happy with my doubles golds [in Sydney 2000 and Beijing 2008].
"I thought, 'If my career's over I have my gold medal and now I have everything.'
"I have singles, doubles, actually everything there is to win in tennis. Where do I go from here?"