Best of the Australian Open 2016

A view of the Rod Laver Arena during the first round match between Kristyna Pliskova of the Czech Republic and Samantha Stosur of AustraliaCameron Spencer/Getty Images

20 January 2016 A general view during the second-round match between Jo-Wilfried Tsonga and Omar Jaskia. Cameron Spencer/Getty Images

Novak Djokovic serves to Hyeon Chung, winning in straight sets, 6-3, 6-2, 6-4. Lukas Coch/AAP

Andy Murray of Great Britain serves in his first round match against Alexander Zverev of GermanyMark Kolbe/Getty Images

20 January 2016 Timea Babos serves to Belinda Bencic, who advances 6-3, 6-3. Lukas Coch/AAP

Tomas Berdych serves to Yuki Bhambri. Berdych progresses with a 7-5, 6-1, 6-2 victory. Ryan Pierse/Getty Images

Novak Djokovic serves to Hyeon Chung of South Korea in their first-round match on Day 1 of the Australian Open in Melbourne, Australia, 18 January 2016. Lukas Coch / EPA

Petra Kvitova serves to Luksika Kumkhum, Kvitova won 6-3, 6-1. Cameron Spencer/Getty Images

Verdasco serves to Nadal on his way to winning 7-6, 4-6, 3-6, 7-6, 6-2. Mast Irham/EPA

Spain's Garbine Muguruza serves during her first round match against Estonia's Anett Kontaveit at the Australian Open, January 19, 2016. REUTERS/Jason O'Brien

Johanna Konta serves to Venus Williams, Konta goes through to the next round after beating the world’s No8 seed, 6-4, 6-2. Michael Dodge/Getty Images

Britain's Andy Murray serves during his second round match against Australia's Sam Groth at the Australian Open tennis tournament at Melbourne Park, Australia, January 21, 2016. REUTERS/Jason O'Brien

20 January 2016 Tomas Berdych returns to Mirza Basic. Berdych, the No6 seed, wins 6-4, 6-0, 6-3. Made Nagi/EPA

20 January 2016 Roger Federer serves against Alexandr Dolgopolov. The world No3 goes through 6-3, 7-5, 6-1. Mast Irham/EPA

Serbia's Novak Djokovic hits a shot during his first round match against South Korea's Hyeon Chung at the Australian Open, January 18, 2016. REUTERS/Jason Reed

Serena Williams's shadow is seen as she hits a shot during her first round match against Italy's Camila GiorgiJason O'Brien/Reuters

Andy Murray of Great Britain takes off in his first round match against Alexander Zverev of GermanyMark Kolbe/Getty Images

A player prepares to serve at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. Photo by Thomas Peter/Reuters

France's Gael Monfils serves during his first round match against Japan's Yuichi Sugita at the Australian Open tennis tournament at Melbourne Park, Australia, January 19, 2016. REUTERS/Brandon Malone

Tammi Patterson serves against Ana Ivanovic. Ivanovic won the match in straight sets 6-2, 6-3. Greg Wood/AFP/Getty Images

Russia's Maria Sharapova hits a shot during her second round match against Belarus' Aliaksandra Sasnovich at the Australian Open. REUTERS/Jason O'Brien

Melbourne, Australia - January 20: Eugenie Bouchard of Canada serves in her second round match against Agnieszka Radwanska of Poland during day three of the 2016 Australian Open at Melbourne Park on January 20, 2016 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

Victoria Azarenka stretches to make a backhand return to Alison Van Uytvanck. Azarenka goes through without losing a single game. Aaron Favila/AP

20 January 2016 Novak Djokovic stretches to hit a return to Quentin Halys, beating Halys 6-1, 6-2, 7-6. Jason O'Brien/Reuters

Jo-Wilfried Tsonga stretches to return to Marcos Baghdatis.. Filip Singer/EPA

Stanislas Wawrinka in action against Dmitry Tursunov. Wawrinka goes through after Tursunov retired injured. Mast Irham/EPA

Rafael Nadal of Spain in action against Fernando Verdasco of Spain during their first round match at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 19 January 2016. EPA/MAST IRHAM

Agnieszka Radwanska of Poland in action against Christina McHale of the US during their first-round match at the Australian Open in Melbourne, Australia, 18 January 2016. Mast Irham / EPA

Czech Republic's Karolina Pliskova serves during her first round match against Australia's Kimberly Birrell at the Australian Open tennis tournament at Melbourne Park, Australia, January 19, 2016. REUTERS/Issei Kato

Australia's Nick Kyrgios throws his racquet during his third round match against Czech Republic's Tomas Berdych at the Australian Open tennis tournament at Melbourne Park, Australia, January 22, 2016. REUTERS/Jason Reed

Lleyton Hewitt celebrates after winning against compatriot James Duckworth, 7-6, 6-2, 6-4. Thomas Peter/Reuters

Watson is distraught after losing her first round match. Andrew Brownbill/AP

Elizaveta Kulichkova celebrates after beating Andrea Petkovic 7-5, 6-4. Lynn Bo Bo/EPA

Gaël Monfils plays a forehand return to Yuichi Sugita. Monfils goes through after winning in straight sets 6-1, 6-3, 6-2. Peter Parks/AFP/Getty Images

Kevin Anderson smashes his racket in frustration on his way to defeat against Rajeev Ram, retiring while trailing 6-7, 7-6, 3-6, 0-3. Vincent Thian/AP

Nick Kyrgios plays a forehand return to Pablo Carreño Busta. Kyrgios moves to the next round, winning 6-2, 7-5, 6-2. Mark Kolbe/Getty Images

Eugenie Bouchard towels down during her match against Aleksandra Krunic, Bouchard goes through, winning 6-3, 6-4. Scott Barbour/Getty Images

Zhang Shuai returns to Simona Halep. Lukas Coch/EPA

The unseeded Putintseva celebrates after winning her match against the 16th seed, Wozniacki, 1-6, 7-6, 6-4. Issei Kato/Reuters

Puerto Rico's Monica Puig celebrates after winning her second round match against Czech Republic's Kristyna Pliskova at the Australian Open tennis tournament at Melbourne Park, Australia, January 20, 2016. REUTERS/Jason Reed

Denmark's Caroline Wozniacki receives treatment to her foot during her first round match against Kazakhstan's Yulia Putintseva at the Australian Open, January 18, 2016. REUTERS/Issei Kato

Germany's Alexander Zverev holds a towel to his bleeding nose before receiving medical treatment for it during his first round match against Britain's Andy Murray at the Australian Open, January 19, 2016.. REUTERS/Jason O'Brien

Ball boys and members of the staff dry the court after a rain delay at the Australian Open tennis tournament at Melbourne Park, Australia, January 22, 2016. REUTERS/Jason Reed

Ball boys remove water from a court during a rain delay at the Australian Open. REUTERS/Tyrone Siu

Ball boys are pictured at the Australian Open tennis tournament at Melbourne ParkTyrone Siu/Reuters

A bird lands on the court during the first round match between Serbia's Viktor Troicki and Spain's Daniel Munoz de la Nava at the Australian Open. REUTERS/Tyrone Siu

Spain's Rafael Nadal reacts during his first round match against Spain's Fernando Verdasco at the Australian Open. REUTERS/Thomas Peter

Caroline Wozniacki hits a double forehand return to Yulia Putintseva. Tyrone Siu/Reuters

Babos celebrates after defeating Watson 6-7, 7-5, 7-5. Andrew Brownbill/AP

Roger Federer plays a forehand against Nikoloz Basilashvili and the Swiss player wins easily in straight sets, 6-2, 6-1, 6-. Cameron Spencer/Getty Images

Anastasija Sevastova hits a backhand return to Jarmila Wolfe. Sevastova advances. Andrew Brownbill/AP

Venus Williams of the United States makes a backhand return to Johanna Konta of Britain during their first round match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 19, 2016.(AP Photo/Aaron Favila)

Sweat drips from the nose of Spain's Rafael Nadal during his first round matchThomas Peter/Reuters

Estonia's Anett Kontaveit hits a shot during her first round match against Spain's Garbine Muguruza at the Australian Open, January 19, 2016. REUTERS/Thomas Peter

Australia's Daria Gavrilova kisses her racquet during her second round match against Czech Republic's Petra Kvitova at the Australian Open tennis tournament at Melbourne Park, Australia, January 20, 2016. REUTERS/Issei Kato

Zhang celebrates after winning against No2 seed Halep, winning in straight sets 6-4, 6-3. Jason Reed/Reuters

Angelique Kerber in action against Misaki Doi, Kerber goes through winning 6-7, 7-6, 6-3. Mast Irham/EPA

Australia's Nick Kyrgios tries to kiss the ball as it flies past during his second round match against Uruguay's Pablo Cuevas at the Australian Open tennis tournament at Melbourne Park, Australia, January 20, 2016. REUTERS

Australian Open 2016: Serena Williams, the grand dame of tennis

Serena Williams eyes the ball as she returns to Daria Kasatkina during their third-round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 22, 2016. AP/ Aaron Favila

Serena Williams of the US plays a shot against Daria Kasatkina of Russia during their third round match at the Australian Open tennis tournament in Melbourne, Australia, 22 January 2016. EPA

Serena Williams of the United States reacts as she plays Daria Kasatkina of Russia during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 22, 2016.(AP Photo/Aaron Favila)

Serena Williams of the US plays a shot against Daria Kasatkina of Russia during their third round match at the Australian Open tennis tournament in Melbourne, Australia, 22 January 2016. EPA

Melbourne, Australia - January 22: Serena Williams of the United States looks on in her third round match against Daria Kasatkina of Russia during day five of the 2016 Australian Open at Melbourne Park on January 22, 2016 in Melbourne, Australia. Michael Dodge/Getty Images

Serena Williams of the U.S. serves during her second round match against Taiwan's Hsieh Su-wei at the Australian Open. REUTERS/Thomas Peter

The top seed, Serena Williams, reaches for a shot against Camila Giorgi. Jason Reed/Reuters

Serena Williams of the US in action against Camila Giorgi of Italy during their first-round match at the Australian Open in Melbourne, Australia, 18 January 2016. Mast Irham / EPA

Serena Williams of the US serves against Camila Giorgi of Italy during their first round match on day one of their Australian Open tennis tournament in Melbourne, Australia, 18 January 2016. EPA/ LUKAS COCH)

Serena Williams of the United States serves in her second round match against Su-Wei Hsieh of Chinese Taipei during day three of the 2016 Australian Open at Melbourne Park on January 20, 2016 in Melbourne, Australia.  Getty Images/ Scott Barbour)

Serena Williams during the game against Russian Daria Kasatkina, January 22, 2016. Jason Reed, Reuters

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Serena Williams of the US serves during her first round match against Italy's Camila Giorgi. Jason O'Brien/Reuters oes