China increased their lead at the top of the medals table on day three of the Olympic Games as they picked up three more golds.

Teenage diving duo Cao Yuan and Zhang Yanquan comfortably won gold in the 10-metre platform synchro at the Aquatics Centre.

The victory extended their unbeaten record in international competition since they took over as China's first choice after last year's World Championships in Shanghai.

Li Xueying took the gold in the women's 58kg weightlifting division and the men's gymnastics team retained their Olympic title after an inquiry into the score of Kohei Uchimura's pommel horse routine saw Japan claim silver and Britain downgraded to bronze.

That took China's golds tally to nine.

The United States stayed in second place in the table with five golds, collecting two more in swimming.

Matt Grevers set a new Olympic record in the men's 100 metres backstroke while teenager Missy Franklin won the equivalent women's event.

France moved into third place.

Yannick Agnel led from the start to dominate the 200 metres freestyle and claim his second Olympic title in 24 hours, giving the French three golds overall. Agnel, 20, had anchored the sprint freestyle relay squad to victory over the United States last night.

North Korea moved to fourth place, also on three golds, as Kim Un Guk triumphed in an exciting men's 62kg competition which saw Olympic and world weightlifting records tumble.

His Chinese rival Zhang Jie was pushed into fourth place, as Kim followed up a snatch of 153kg, which broke the Olympic record and equalled the world best, with a clean and jerk of 174kg, providing him with a stunning personal best total of 327, which also eclipsed both records.

Lithuania gained a sensational first gold in the pool through 15-year-old Ruta Meilutyte who led from the start in the 100m breaststroke.

Mansur Isaev claimed Russia's second judo gold with victory over Japan judoka Riki Nakaya in the under-73kg final. After 20 years without a judo gold, Russia now have two following Arsen Galstyan's win in the under-60kgs on Saturday.

Romanian shooter Alin George Moldoveanu won his country's first gold in the men's 10m air rifle after a titanic tussle with Niccolo Campriani in which both men had equalled the Olympic record in qualifying.

In the women's under-57kg judo final, Japan's Kaori Matsumoto triumphed over Romanian Corina Caprioriu after the latter was disqualified during the golden score period. Caprioriu was penalised for trying to hold Matsumoto's leg to flip over the Japanese.

Yana Shemyakina won Ukraine's first-ever individual fencing gold, defeating Germany's 2008 champion Britta Heidemann after a huge controversy.

South Korean Shin A Lam was left in tears and without a medal in the women's epee, after spending an hour on the piste while an unsuccessful appeal into her semi-final defeat to Heidemann went on.