A boy smiles in front of performers dressed in tennis ball outfits before the start of the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Thomas Peter/Reuters)





Czech Republic's Lucie Hradecka hits a shot during her first round match against Australia's Daria Gavrilova at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Thomas Peter/Reuters)





Serena Williams of the U.S. serves during her first round match against Italy's Camila Giorgi at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





Britain's Heather Watson smashes her racquet into the signage during her first round match against Hungary's Timea Babos at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





Japan's Kei Nishikori signs autographs after winning his first round match against Germany's Philipp Kohlschreiber at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Serena Williams of the U.S. reaches for a shot during her first round match against Italy's Camila Giorgi at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





Belgium's David Goffin signs autographs after winning his first round match against Ukraine's Sergiy Stakhovsky at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Brandon Malone/Reuters)





Czech Republic's Tomas Berdych signs autographs after winning his first round match against India's Yuki Bhambri at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Thomas Peter/Reuters)





Serbia's Novak Djokovic serves during his first round match against South Korea's Hyeon Chung at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





China's Wang Qiang celebrates winning her first round match against Sloane Stephens of the U.S. at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Tyrone Siu/Reuters)





Sloane Stephens of the U.S. hits a shot during her first round match against China's Wang Qiang at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Serbia's Novak Djokovic stretches to hit a shot during his first round match against South Korea's Hyeon Chung at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason Reed/Reuters)





Kazakhstan's Yulia Putintseva stretches for a shot during her first round match against Denmark's Caroline Wozniacki at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Kazakhstan's Yulia Putintseva jumps to hit a shot during her first round match against Denmark's Caroline Wozniacki at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Denmark's Caroline Wozniacki hits a shot during her first round match against Kazakhstan's Yulia Putintseva at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Serbia's Novak Djokovic signs autographs after winning his first round match against South Korea's Hyeon Chung at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





A player prepares to serve at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. World tennis was rocked on Monday by allegations that the game's authorities have failed to deal with widespread match-fixing, just as the Australian Open, the first Grand Slam tournament of the year, kicked off in Melbourne. (Photo by Thomas Peter/Reuters)





Italy's Roberta Vinci hits a shot during her first round match against Austria's Tamira Paszek at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by John French/Reuters)





Kazakhstan's Yulia Putintseva celebrates after winning her first round match against Denmark's Caroline Wozniacki at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Kazakhstan's Yulia Putintseva celebrates after winning her first round match against Denmark's Caroline Wozniacki at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Sloane Stephens of the U.S. serves during her first round match against China's Wang Qiang at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Kazakhstan's Yulia Putintseva reacts after winning her first round match against Denmark's Caroline Wozniacki at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Issei Kato/Reuters)





Switzerland's Roger Federer signs autographs after winning his first round match against Georgia's Nikoloz Basilashvili at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





Russia's Maria Sharapova celebrates after winning her first round match against Japan's Nao Hibino at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Thomas Peter/Reuters)





Russia's Maria Sharapova signs autographs after winning her first round match against Japan's Nao Hibino at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Thomas Peter/Reuters)





Russia's Maria Sharapova walks off court after signing autographs following her win in her first round match against Japan's Nao Hibino at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Thomas Peter/Reuters)





Hungary's Timea Babos reacts after winning the second set during her first round match against Britain's Heather Watson at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





Russia's Teymuraz Gabashvili reacts as he receives treatment to his foot during his first round match against Italy's Andreas Seppi at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by John French/Reuters)





Czech Republic's Kristyna Pliskova hits a shot during her first round match against Australia's Samantha Stosur at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





Czech Republic's Kristyna Pliskova receives treatment to her leg during her first round match against Australia's Samantha Stosur at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





Hungary's Timea Babos celebrates after winning her first round match against Britain's Heather Watson at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)





An electronic billboard displays an advertisement behind France's Jo-Wilfried Tsonga during his first round match against Cyprus' Marcos Baghdatis at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Thomas Peter/Reuters)





Czech Republic's Kristyna Pliskova reacts after winning her first round match against Australia's Samantha Stosur at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. (Photo by Jason O'Brien/Reuters)