A combination of photographs created on July 5, 2014 shows Serbia's Novak Djokovic (L) returning during his men's singles second round match against Czech Republic's Radek Stepanek on day three of the 2014 Wimbledon Championships and Switzerland's Roger Federer (R) hitting a return during his men's singles third round match against Colombia's Santiago Giraldo on day six at The All England Tennis Club in Wimbledon, southwest London. Djokovic takes on seven-time Wimbledon champion Roger Federer in the men's singles final in the 2014 Wimbledon Championships on July 6, 2014. AFP PHOTO / ANDREW YATES  - RESTRICTED TO EDITORIAL USE        (Photo credit should read ANDREW YATES/AFP via Getty Images)