Street artist James Cochran, a.k.a. Jimmy C, puts the finishing touches to a piece of work depicting the face of Jamaican sprinter Usain Bolt on July 20, 2012 in London, England. The opening ceremony of the 2012 Olympic games will take place in seven days on July 27, 2012. (Dan Kitwood/Getty Images)
Young male gymnasts (bottom) stretch their legs as a female gymnast jumps on a stage at a local juvenile sports school in Jiaxing, Zhejiang province July 10, 2012.
Roger Federer of Switzerland celebrates after defeating Andy Murray of Britain in their men's singles final tennis match at the Wimbledon Tennis Championships in London July 8, 2012. (Reuters/Toby Melville)
Two-year-old twins Charlene Riva and Myla Rose, the children of Roger Federer and his wife Mirka, can't believe their eyes after dad defeated Andy Murray. (Reuters/Stefan Wermuth)
Andy Murray of Britain takes a tumble during the match. (AP Photo/Anja Niedringhaus)
Serena Williams of the U.S. celebrates after defeating Victoria Azarenka of Belarus in their women's semi-final tennis match at the Wimbledon tennis championships in London July 5, 2012.
Mexico's Vanessa Zambotti (in white) reacts after defeating Brazil's Claudirene Cezar in their women's plus 78kg final match at the Rio de Janeiro International Grand Slam judo tournament June 10, 2012.
AFP PHOTO / FILIPPO
Dutch forward Robin van Persie (L) vies with Danish defender and captain Daniel Agger during the Euro 2012 football championships group match between the Netherlands and Denmark on June 9, 2012 at the Metalist Stadium in Kharkiv.