Olympics 2012: I have to be the best - Michael Phelps
Sixteen-time Olympic medallist Michael Phelps says his competitive nature is why he is multiple champion and that he "despises losing".
Phelps believes he has "learnt from the mistakes" he made in 2010.
He also says his rivalry with Ryan Lochte has "motivated" him to try and win every event he races in after Lochte beat Phelps to gold in the 200m freestyle at the World Championships last year.
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