Phelps: I'm not unbeatable

US swimmer Michael Phelps has insisted he is not unbeatable despite providing yet more evidence to the contrary.

Phelps collected his fourth and fifth golds in Beijing, the 10th and 11th of his career, in the 200 metres butterfly and 4x200m freestyle relay - both in world-record times.

Added to his six golds from Athens four years ago, that meant Phelps surpassed the nine golds won by Paavo Nurmi, Carl Lewis, Mark Spitz and Larysa Latynina to cement his place in Olympic history.

The 23-year-old has three events left and remains on course to beat Spitz's achievement of seven golds in one Games after winning his heat in the 200m individual medley on Wednesday, but claimed: "It's not over yet. Anything can happen in the next three events.

"This is something we have been preparing for for the last four years. All the work is starting to pay off. But I am not unbeatable. Everyone can be beaten."

Phelps had to overcome his goggles filling with water to win the 200m butterfly in one minute 52.03 seconds, lowering his own world record by 0.06s ahead of Hungary's Laszlo Cseh and Japan's Takeshi Matsuda.

"I'm almost at a loss for words. To be the most decorated Olympian of all time, it just sounds weird. I am speechless," Phelps added.

"It started to sink in a little after the butterfly. I was trying to focus on my next race but I kept thinking 'Wow. Greatest Olympian of all time.' It's a pretty neat title and I'm definitely honoured.

"When you have an Olympic gold medal it stays with you forever. It never gets old listening to your national anthem with a gold medal around your neck."

Olympic Gold medal update

Michael Phelps has created history by being the first athlete to win 11 goal medals at the Olympic Games.

The USA team wins gold in the men's 4x200m freestyle relay final in a world record time of 6:58.56 giving Michael Phelps his fifth gold of the Games.

In an earlier race, the American took 0.06 second off the previous record of 1:52.09 he set at Melbourne in March 2007 to claim his fourth gold and fourth world record in the Water Cube.

Laszlo Cseh of Hungary (1:52.70) and Matsuda Takeshi of Japan (1:52.97) claimed silver and bronze, and the European and Asian records, respectively.

Two days after setting the world record in the Women's 200m Freestyle prelims, Italy's Federica Pellegrini swam and even faster 1:54.82 to take the gold medal in Wednesday's final. Second was Sara Isakovic of Slovenia (1:54.97) with China's Pang Jiaying (1:55.05) in third.

Australia's Stephanie Rice has broken the world record in the final of the women's 200 metres individual medley in a time of 2:08.45.

Phelps bags fourth gold

Michael Phelps became the most successful Olympic athlete of all time by claiming his 10th gold medal in the 200m butterfly.

Phelps collected his fourth gold of the 29th Olympiad in Beijing to add to the six gold and two bronze medals secured in Athens four years ago.

The 23-year-old led from the halfway point but was made to battle hard to win in a world record time of 1:52.03 seconds, beating his own previous best by 0.06s ahead of Hungary's Laszlo Cseh and Japan's Takeshi Matsuda.

That keeps the American on target to win an unprecedented eight gold medals in the Chinese capital, with another on the cards later Wednesday morning in the 4x200m freestyle relay.

World records were the order of the day as France's Alain Bernard and Australian Eamon Sullivan earlier traded times in the 100 metres freestyle in the National Aquatics Centre.

Bernard clocked a time of 47.20 seconds in winning the first semi-final, beating the previous mark of 47.24s set by Sullivan in the 4x100m relay earlier this week.

But Sullivan then went even quicker in the second semi-final, recording a time of 47.05 to reclaim the record and set up a mouthwatering final showdown on Thursday.

Another world record was broken in the women's 200m freestyle, Italian Federica Pellegrini taking gold in a time of 1:54.82 to lower her own mark set earlier in the week by 0.63s.

Slovenia's Sara Isakovic claimed the silver ahead of home favourite Jiaying Pang.

Yet another world record went in the women's 200m individual medley, Australian Stephanie Rice lowering her own mark by 0.47s.

Rice took gold in a time of 2:08.45, just finishing ahead of Zimbabwe's Kirsty Coventry with American Natalie Coughlin third.