Switzerland’s Stan Wawrinka hits a shot to Spain’s Rafael Nadal as they practice together on Rod Laver Arena at Melbourne Park

Switzerland’s Stan Wawrinka hits a shot to Spain’s Rafael Nadal as they practice together on Rod Laver Arena at Melbourne Park January 14, 2015. The Australian Open tennis tournament begins on January 19. REUTERS/David Gray (AUSTRALIA – Tags: SPORT TENNIS)

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