Stanislas Wawrinka of Switzerland hits a return to Novak Djokovic of Serbia during their men’s singles quarter-final tennis match at the Australian Open 2014 tennis tournament in Melbourne

Stanislas Wawrinka of Switzerland hits a return to Novak Djokovic of Serbia during their men’s singles quarter-final tennis match at the Australian Open 2014 tennis tournament in Melbourne January 21, 2014. REUTERS/Petar Kujundzic (AUSTRALIA – Tags: SPORT TENNIS) – RTX17NQM