Record-breaker: Michael Phelps

Hes all out to prove himself that this time he wont mistakes though he rarely does.He made his intentions for these Games clear from the start, breaking his own Olympic record in the heats of the 400m individual medley.

The 23-year-old American was inside his own world-record pace after the opening butterfly leg and just 0.02 seconds outside it after the second backstroke leg.

And although he dropped off record pace after the breaststroke, he still recorded a record time of four minutes 7.82 seconds, 2.57secs outside his world record set earlier this year.

Phelps won six gold medals at the Athens Olympics four years ago, but aims to go even further in Beijing. The benchmark to beat is the one set by seven-gold tally set by American Mark Spitz in the 1972 Games.