The 2012 London Olympics featured gymnastics Monday, a day after Jamaican sprinter Usain Bolt successfully defended his 100 meter title and set a new Olympic record at 9.63 seconds.

On the women's uneven bars, Russia's Aliya Mustafina won the gold medal over China's Kexin He, who won silver, and Britain's Beth Tweddle, who won bronze. U.S. teenage gymnast Gabby Douglas, who has emerged as a star of the Games, was competing for her third gold medal in the event, but only placed eighth.

Brazil's Arthur Nabarrete Zanetti won gold in the men's rings final, besting China's Yibing Chen, who finished second, and Italy's Matteo Morandi, who placed third.

South Korea's Hak Seon Yang placed first in the men's vault, ahead of Denis Ablyazin at second and Ukraine's Igor Radivilov at third.

In the 50-meter rifle three position event, Italy's Niccolo Campriani placed first, ahead of South Korea's Jonghyun Kim at second and America's Matt Emmons at third.

Later in the day, medal races will be featured in track and field for the men's 400 meter hurdles and 400 meters, as well as women's pole vault, shot put and steeplechase.

Also, competitors will face off in the 60 kilogram, 84 kilogram and 120 kilogram wrestling matches, as well as the men's 105 kilogram weightlifting.

Meanwhile, the U.S. basketball team, which barely won its game against Lithuania last week, plays Argentina, a tough team that lost to the U.S. last month by a slim 86 to 80 in an exhibition game.

China leads the overall medal count for the 2012 London Olympics with 64 total, including 31 gold. A close second is the United States with 61 medals including 28 gold. Britain is third in the medal race, with 38 total including 16 gold.