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Tunisia's Oussama Mellouli won his second medal of the London Olympics with victory in the gruelling men's 10-kilometre marathon swim on Friday.
Mellouli finished the open-water swim in a time of 1 hour 49 min 55 seconds, a clear three seconds ahead of his closest challenger Thomas Lurz of Germany, who added silver to the bronze he won in Beijing four years ago.
Bronze in Hyde Park's Serpentine lake went to Canada's Richard Weinberger.
Mellouli earlier won bronze in the 1,500-metre swim, the event in which he won gold in 2008 Beijing Games.