BEIJING, Aug 14: Japanese swimmer Kosuke Kitajima and Chinese gymnast Yang Wei led a golden day for Asia on Thursday that showcased the continent’s growing sports power.

As hosts China powered ahead in the medals’ table on Games day six, two of the biggest names in Beijing, Roger Federer and Serena Williams, crashed out of the tennis singles at the quarter-final stage.

There was a rare sour note in an otherwise good-natured Games when a Swedish wrestler tossed away his bronze medal in disgust at the refereeing.

“I don’t care about this medal,” said Ara Abrahamian, pulling the prize off his neck on the podium.

In the Water Cube, Asia’s greatest swimmer Kitajima stole the spotlight from American Michael Phelps with an unprecedented ‘double-double’ in the breaststroke, adding the 200 metres gold to the 100 title he won on Monday. He won both in Athens in 2004.

There were sweet victories too for Chinese gymnast Yang Wei, who ended eight years of hurt in the men’s individual all-round event, and for shooter Du Li, who had broken down in tears after failing to win the first gold of the Games on day one.

China even took an unexpected gold in women’s archery thanks to Zhang Juan Juan. That ended South Korea’s streak of winning every women’s Olympic archery gold medal since 1984.

Asian nations have won nearly half of the golds so far.

Mongolia joined the party, taking the first gold medal in its history when Tuvshinbayar Naidan won the 100kg judo.

China leads the overall medals’ table with 22 golds.

America follows on 10 golds — five of those thanks to swimmer Phelps and relay team mates — but will expect to come back strongly when track-and-field events start on Friday.

Germany are third with seven golds, followed by South Korea and Italy on six.

Replacing old Cold War rival Russia as America’s main challenger at the Olympics, China came second in Athens and is mounting a formidable challenge to go one better at home.

Greco-roman wrestling took the limelight for the wrong reasons on Thursday when Sweden’s Abrahamian rejected his medal and announced he was quitting the sport. He shouted and later whacked a barricade with his fist in a row over the judges’ decision during a semi-final bout with the eventual winner.

The Water Cube again saw plenty of excitement. France’s Alain Bernard won swimming’s blue riband event, the men’s 100 freestyle, by a whisker.

Stephanie Rice, the glamour girl of Australian swimming, took her third gold of the Games in the 4x200m freestyle relay.

Then hosts China scored a shock one-two in the pool. Nineteen-year-old Liu Zige destroyed the world record in the women’s 200 butterfly and compatriot Jiao Liuyang relegated Australian world champion Jessica Schipper to third.

China have dominated gymnastic in these Games, and Yang, unbeaten on the international stage since 2006, followed team gold with another in the men’s individual all-round event.

There was relief, too, for Chinese shooter Du, who steadied earlier nerves to win the women’s 50m rifle three positions.

Rainstorms washed away the Beijing smog but also caused delays in tennis, softball, canoeing and rowing. Beach volleyball players struggled on though, squelching through the sand.

—Reuters