A general view of the Velodrome during previews ahead of the London Olympic Games on July 24, 2012 in London, England

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Greg McFadden coach of Australia gives instructions to his players during a women's water polo practise session at Water Polo Arena at the Olympic Park

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Players of the women's USA team attend a water polo practise session at Water Polo Arena at the Olympic Park on July 24, 2012 in London, England

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A general view of the Lee Valley White Water Centre during previews on July 24, 2012 in London, England

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David Florence of Great Britain in a practice session at the Lee Valley White Water Centre during previews on July 24, 2012 in London, England

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Caroline Wozniacki of Denmark speaks with her father and coach Piotr Wozniacki during a practice session ahead of the 2012 London Olympic Games

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The United States women's field hockey team practice during a training session ahead of the London Olympic Games

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Athletes carry their boat during rowing training at Eton Dorney on July 24, 2012 in London, England

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Mahe Drysdale of New Zealand during rowing training at Eton Dorney on July 24, 2012 in London, England

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Russia's Maria Sharapova returns the ball during a training session at the Olympic tennis venue at the All England Tennis Club in Wimbledon

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Torchbearer 071 Jack Taylor carries the Olympic Flame on the Torch Relay leg through Hounslow (London Borough)

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Roger Federer of Switzerland plays a stroke as he takes part in a training session at the All England Tennis Club in Wimbledon

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Mathew Belcher and Malcolm Page of Australia in action during a training race ahead of the London 2012 Olympic Games at the Weymouth and Portland venue

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Volunteers prepare for visitors at the Olympic Park on July 24, 2012 in London, England. The opening ceremony of the 2012 London Olympic Games will take place on July 27

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Members of the public walk past the John Lewis department store, where a giant Union Flag adorns it's facades, on Oxford Street on July 24, 2012 in London, England

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Lee Kiefer of the USA fencing team warms up with Kyomi Hirata of Japan during a practice session ahead of the 2012 London Olympic Games

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James Cracknell carries the Olympic Flame on the Torch Relay leg through Kingston Upon Thames

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Team GB rider Nicole Cooke in action on a training ride ahead of the Women's Olympic Road Race

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Wu Penggen of China's Olympic beach volleyball team jumps to spike the ball during a training session in Horse Guard Parade in central London

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The German womens Rowing Coxed Eights squad practises during rowing training at Eton Dorney

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Tamsin Hinchley (L) and Natalie Cook from Australia's Olympic beach volleyball team attend a training session in Horse Guard Parade in central London

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An athlete practices during a diving training session ahead of the London Olympic Games at the Aquatics Centre in Olympic Park

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Michael Phelps (L) of the United States looks on as he stands next to his coach Bob Bowman during a training session ahead of the London Olympic Games at the Aquatics Centre in Olympic Park

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Ryan Lochte of the United States adjusts his goggles as he looks on during a training session ahead of the London Olympic Games at the Aquatics Centre in Olympic Park

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Members of team Korea DPR during a weightlifting practice session at ExCel on July 24, 2012 in London, England

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Ballet dancers perform on stage during the Opening Ceremony of the 124th IOC Session, prior to the start of the London 2012 Olympic Games

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Sally Pearson of Australia trains during an Athletics Australia Olympic Media Day at Tonbridge Training Camp

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France's player Nicolas Batum (R) vies with Australia's player Patty Mills, during the basketball match France vs Australia in preparation for the London 2012 Olympics

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Olympics rings have been hung on the tower bridge on July 24, 2012 in London, three days before the start of the London 2012 Olympic Games

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