United States' Michael Phelps swims in his men's 200-meter individual medley heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Wednesday, Aug. 1, 2012.(AP Photo/The Canadian Press, Ryan Remiorz)
Serena Williams of the United States returns to Vera Zvonareva of Russia at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012. (AP Photo/Elise Amendola)
Gabby Douglas won the women's all-around title and qualified for the U.S. Olympic gymnastics team. (AP Photo/Jae C. Hong)
(AURN) -- Swimmer Michael Phelps, gymnist Gabby Douglas and pro-tennis player Serena Williams have emerged as winnners at this year's London Olympics.