Mu Shuangshuang smashed the world snatch mark on the way to winning gold in the +75kg category of the women's weightlifting, bringing to five the number of world records to fall in Doha.

The 22-year-old double world silver medallist lifted 139kg to beat by 1kg the previous record set by South Korean Jang Mi Ran in May.

Jang had failed in her attempt to break her own record just minutes before Mu's successful effort, and she had a chance to win the event but bombed out at what would have been a record-equalling 182kg in the clean and jerk.

The 23-year-old double world champion had to make do with silver with Thailand's Annipa Moontar taking bronze.

Thailand's Pawina Thongsuk set a world mark in the clean and jerk of the women's 63kg category earlier in the week while China's Chen Yanqing produced three world records to win gold in the women's 58kg category.

More records could fall later Wednesday when Iran's double Olympic weightlifting champion Hossein Rezazadeh, one of the strongest men on earth, enters the fray.

Nine Iranian lifters were banned for two years for testing positive just months before the Games but Rezazadeh, known as the Iranian Hercules, was not among them and he will compete in the heavyweight 105+ category here.

Rezazadeh, who has won an incredible 10 gold medals at the world championships and holds the world records for the snatch (213kg) and total (472kg) as well as the clean and jerk, is the defending Asian Games champion.

Midway through day five, China had 67 gold medals to Japan's 18 and South Korea's 14. Kazakhstan, thanks to its shooters and weightlifters, has 10.

While the Chinese have been thumping allcomers across the board, its swimmers have not lived up to the high standards demanded by coach Zhang, who, like all competitors, has his eye on the Olympics in Beijing.

Zhang set his team the target of winning four out of seven gold medals on Tuesday but they had to settle for three, which didn't go down well.

"The morale of the team will be affected by that defeat," stormed Zhang. "It should not have happened."

Defending champion Qi Hui says she will deliver gold in the 200m breaststroke later Wednesday to add to her 400m individual medley gold medal.

She was fastest in qualifying but faces a strong challenge from Asami Kitagawa of Japan who won the 100m gold on Tuesday.

"In the 100m breaststroke there were many young swimmers so I did not enter the event," said Qi. "But in the 200m I have no problem to get gold."

Two Chinese are favourites for another gold in the women's 100m freestyle. Pang Jia-Ying and defending champion Xu Yanwei should be battling for honours.

Reiko Nakamura of Japan is the favourite in the 100m backstroke.

Meanwhile, South Korean teenager Park Tae-Hwan could win a third individual title in the 100m men's freestyle.

After giving up golds to North Korea, South Korea and Japan in the gymnastics routines on Tuesday, China's world champion team will be hungry to reassert their dominance on Wednesday.

The men's vault, parallel bars and horizontal bars will be decided, while the women will vie for the beam and floor exercise titles.

On the rowing course, five gold Wednesday were divided between China, Uzbekistan and Japan, while on the shooting ranges China took four titles and Kazakhstan one.

Elsewhere, China, led by world No.4 Ding Junhai, will cue off for the snooker team title against Hong Kong.