Novak Djokovic, Stan Wawrinka and Daniel Nestor in action
Lucie Safarova of the Czech Republic and Bethanie Mattek-Sands of the United States in action in their final doubles match against Yung-Jan Chan of Chinese Taipei and Jie Zheng of China at 2015 Australian Open at Melbourne Park on January 30, 2015 in Melbourne, Australia.Scott Barbour/Getty Images
Chan Yung-Jan and China's Zheng Jie react after a point against Bethanie Mattek-Sands and Lucie Safarova during the women's doubles final.MAL FAIRCLOUGH/AFP / Getty Images
Bethanie Mattek-Sands serves past partner Lucie Safarova during the women's doubles final.MAL FAIRCLOUGH/AFP / Getty Images
Bethanie Mattek-Sands and Lucie Safarova celebrate after victory against Chan Yung-Jan and Zheng Jie during the women's doubles final.MAL FAIRCLOUGH/AFP / Getty Images
Bethanie Mattek-Sands and Lucie Safarova celebrate defeating Zheng Jie and Chan Yung-Jan to win their women's doubles final match at the Australian Open tennis tournament.ISSEI KATO/Reuters
Lucie Safarova, left, and Bethanie Mattek-Sands hold the trophy after winning their final doubles match.Michael Dodge/Getty Images
Daniel Nestor of Canada plays a forehand in their semi-final mixed doubles match with Kristina Mladenovic of France against Sania Mirza of India and Bruno Soares of Brazil.Patrick Scala/Getty Images
Serbia's Novak Djokovic plays a shot during his men's singles semi-final match against Switzerland's Stanislas Wawrinka.WILLIAM WEST/AFP / Getty Images
Stanislas Wawrinka serves during his men's singles semi-final match against Novak Djokovic.PAUL CROCK/AFP / Getty Images
Novak Djokovic of Serbia plays a forehand in his semi-final match against Stanislas Wawrinka of Switzerland.Clive Brunskill/Getty Images
Stan Wawrinka of Switzerland serves to Novak Djokovic of Serbia during their men's singles semi-final match at the Australian Open.BRANDON MALONE/Reuters
Serbia's Novak Djokovic hits a return against Switzerland's Stanislas Wawrinka.MAL FAIRCLOUGH/AFP / Getty Images
Switzerland's Stanislas Wawrinka hits a return against Serbia's Novak Djokovic during their men's singles semi-final match.MAL FAIRCLOUGH/AFP / Getty Images
Novak Djokovic of Serbia stretches out for a return to Stan Wawrinka of Switzerland.Lee Jin-man/The Associated Press
Novak Djokovic of Serbia celebrates winning his semi-final match against Stanislas Wawrinka of Switzerland.Scott Barbour/Getty Images
Novak Djokovic of Serbia, right bottom, celebrates after defeating Stan Wawrinka of Switzerland, left, in their semi-final at the Australian Open tennis championship.Shuji Kajiyama/The Associated Press
Novak Djokovic of Serbia and Stanislas Wawrinka of Switzerland hug at the net after Djokovic won their semi-final match.Michael Dodge/Getty Images
Novak Djokovic signs autographs for fans after defeating Stan Wawrinka in their semi-final at the Australian Open tennis championship in Melbourne.Lee Jin-man/The Associated Press
Novak Djokovic of Serbia is interviewed on court after winning his semi-final match against Stanislas Wawrinka of Switzerland.Scott Barbour/Getty Images