Tomas Berdych of Czech Republic and Novak Djokovic of Serbia change ends during their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne

 
Tomas Berdych of Czech Republic and Novak Djokovic of Serbia change ends during their men
Tomas Berdych of Czech Republic (L) and Novak Djokovic of Serbia change ends during their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013. REUTERS/Toby Melville