Greatest Olympian: America's Michael Phelps has won his fourth and fifth gold medals in Beijing and his 10th and 11th overall.Photo: Getty

Baltimore Bullet takes his Olympic gold medal tally to 11 over all .

The victory was not smooth for him. Laslo Cseh and Takeshi Matsuda tried their best to challenged him all the way in a thrilling finale to the men's 200 metres butterfly.

Phelps, who touched the wall in a world record time of 1 minute and 52.09 seconds, was physically exhausted and later he complained about his goggles.

"My goggles were filling up with water during the race, and I had trouble seeing the wall," he said.

"I wanted the world record. I wanted a 1:51 or better, but given the circumstances it's not too bad, I guess."

He ended the first race 4-for-4 in both, setting his latest world record in 1:52.03 and becoming the first athlete ever to win 10 Olympic gold medals.

Later he added an 11th, and fifth in these Olympics, grabbing an obscene lead while swimming the first leg of the 4 x 200 freestyle relay gold-medal team that also included Ryan Lochte, Ricky Berens and Peter Vanderkaay.

And yes, it set another world record, in 6:58.56, obliterating the previous record by 4.68 seconds, finishing more than 5 seconds ahead of runner-up Russia.