An aerial view shows the London 2012 Olympic Games Olympic Stadium, Aquatics Centre, Water Polo and the Orbit, at the Olympic Park in London December 20, 2011. REUTERS/LOCOG/Handout

An underwater view is seen of the swimming pool at the Olympic Aquatics Centre in London February 17, 2012. REUTERS/Eddie Keogh

Hungary's Patrik Szoboszlai jumps during a practice session for the UCI BMX Supercross World Cup 2011 series at the VeloPark within the new London 2012 Olympic Park at Stratford in London August 19, 2011. REUTERS/Luke MacGregor

Players from China and Slovakia compete in a preliminary match in the Olympic test event series London Handball Cup in London November 23, 2011. REUTERS/Paul Hackett

An aerial view shows the North Greenwich Arena with Canary Wharf in the background in London, March 27, 2012. London will host this summer's Olympic Games. REUTERS/Stefan Wermuth

British rowers compete during the GB Rowing Team Senior Trials at the Olympic rowing venue in Eton-Dorney near London March 11, 2012. REUTERS/Stefan Wermuth

William Faudree represents the U.S. during the dressage round of the Equestrian Eventing at Greenwich Park, in south London July 4, 2011. REUTERS/Olivia Harris

General view of the Hampden Park stadium during a training session of the Swiss soccer squad in Glasgow, Scotland February 28. 2006. REUTERS/Pascal Lauener

British Olympic hopeful Liam Killen poses for photographs during a test cycle on part of the Hadleigh farm Olympic mountain bike venue, Hadleigh, eastern England, April 4, 2012. REUTERS/Paul Hackett

Teams from Spain and the Netherlands take part in a practice session ahead of the FIVB Beach Volleyball test event for the London 2012 Olympic Games at Horse Guards Parade in London August 8, 2011. REUTERS/Luke MacGregor

The gated Bow Quarter apartment complex is seen at right near the Olympic stadium in London in a March 27, 2012 file photo. REUTERS/Stefan Wermuth

Spectators watch Britain play South Korea during the women's International Invitational Hockey Tournament at the Riverbank Arena on the Olympic Park in London May 2, 2012. REUTERS/Eddie Keogh

Competitors in the London-Surrey Cycle Classic road race, a test event for the London 2012 Olympic Games, start on The Mall near the Queen Victoria Memorial and its gilded pinnacle statue Victory, in London August 14, 2011. REUTERS/Dan Kitwood/POOL

Cyclists compete in the Women's Keirin Qualifying Race in the UCI Track Cycling World Cup at the Olympic Velodrome in London February 19, 2012. REUTERS/Cathal McNaughton

Spectators watch the U.S. compete against Hungary during a Water Polo International invitational event at the Water Polo Arena in the Olympic Park at Stratford, east London May 3, 2012. REUTERS/Toby Melville

An aerial view shows the Wimbledon tennis championships in London June 27, 2011. REUTERS/Tom Lovelock/AELTC/Pool

Competitors take part in a practice race in the 49er class during the Weymouth and Portland International Regatta at the Weymouth and Portland National Sailing Academy in southern England August 5, 2011. REUTERS/Eddie Keogh

A general view of the Men's Individual Foil Fencing competition during an Olympic test event at the Excel centre in London November 26, 2011. REUTERS/Olivia Harris

An aerial view of Wembley Stadium is seen on its opening day in London, March 17, 2007. REUTERS/Action Images/Pool