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Lleyton Hewitt (L) of Australia shakes hands with Jarkko Nieminen (R) of Finland following his Gentlemen's Singles first round match defeat during day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 29, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Former champion Lleyton Hewitt of Australia acknowledges the crowd following his defeat to Jarkko Nieminen (R) of Finland in his last-ever Gentlemen's Singles match during day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 29, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Nick Kyrgios of Australia reacts in his Gentlemen's Singles Third Round match against Milos Raonic of Canada during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Australian fans cheer on Nick Kyrgios as he prepares to serve in his Gentlemen's Singles Third Round match against Milos Raonic of Canada during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Novak Djokovic of Serbia waves to the crowd as he leaves the court with Bernard Tomic of Australia after their Gentlemen's Singles Third Round match during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)

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Roger Federer of Switzerland shakes hands after winning his Men's Singles Third Round match against Sam Groth of Australia during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Leyton Hewitt of Australia and Thanasi Kokkinakis of Australia celebrate in the Gentlemen's Doubles Second Round match against Robert Lindstedt of Sweden and Jurgen Melzer of Austria during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Julian Finney/Getty Images)

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Leyton Hewitt of Australia and Thanasi Kokkinakis (L) of Australia celebrate in the Gentlemen's Doubles Second Round match against Robert Lindstedt of Sweden and Jurgen Melzer of Austria during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Julian Finney/Getty Images)

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Andy Murray of Great Britain celebrates in his Men's Singles Third Round match against Andreas Seppi during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Kim Murray takes a seat for the Gentlemen’s Singles Third Round match between Andy Murray of Great Britain and Andreas Seppi of Italy during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Novak Djokovic of Serbia plays a forehand in his Gentlemen's Singles Third Round match against Bernard Tomic of Australia during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)

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Dustin Brown of Germany reacts in his Gentlemen's Singles Second Round match against Rafael Nadal of Spain during day four of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 2, 2015 in London, England. (Photo by Ian Walton/Getty Images)

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Rafael Nadal (R) of Spain shakes hands with Dustin Brown of Germany after losing his Gentlemen's Singles Second Round match during day four of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 2, 2015 in London, England. (Photo by Ian Walton/Getty Images)

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Stanislas Wawrinka of Switzerland celebrates a point in his Gentlemen's Singles Third Round match against Fernando Verdasco of Spain during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Julian Finney/Getty Images)

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Samantha Stosur of Australia reacts in her Ladies’ Singles Third Round match against Coco Vandeweghe of the United States during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Ian Walton/Getty Images)

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Samantha Stosur of Australia leaves the court after defeat in her Ladies Singles Third Round match against Coco Vandeweghe of the United States during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Ian Walton/Getty Images)

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Casey Dellacqua of Australia plays a forehand in her Ladies Singles Third Round match against Agnieszka Radwanska of Poland during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Julian Finney/Getty Images)

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Caroline Wozniacki of Denmark reacts in her Ladies Singles Third Round match against Camila Giorgi of Italy during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Ian Walton/Getty Images)

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Serena Williams of the United States plays a forehand in her Ladies Singles Third Round match against Heather Watson of Great Britain during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)

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Venus Williams of the United States plays a backhand in her Ladies Singles Third Round match against Aleksandra Krunic of Serbia during day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Jelena Jankovic of Serbia celebrates match point in her Ladies Singles third Round match against Petra Kvitova of Czech Republic during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Serbia's Jelena Jankovic celebrates beating Czech Republic's Petra Kvitova during their women's singles third round match on day six of the 2015 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2015. Jankovic won 3-6, 7-5, 6-4. (Photo by LEON NEAL/AFP/Getty Images)

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Bastian Schweinsteiger and Ana Ivanovic attend the WTA Pre-Wimbledon Party at Kensington Roof Gardens on June 25, 2015 in London, England. (Photo by Karwai Tang/WireImage)

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Ana Ivanovic of Serbia in action in her Ladies Singles Second Round match against Bethanie Mattek-Sands of the United States of America during day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)

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Bastian Schweinsteiger attends the Ana Ivanovic v Bethanie Mattek-Sands match on day three of the Wimbledon Tennis Championships at Wimbledon on July 1, 2015 in London, England. (Photo by Karwai Tang/WireImage)

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Angelique Kerber of Germany reacts during the Women's Singles Third Round match against Garbine Muguruza of Spain during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)

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Eugenie Bouchard of Canada reacts in her Ladies Singles first round match defeat against Ying-Ying Duan of China during day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Eugenie Bouchard of Canada reacts following her Ladies Singles first round match defeat against Ying-Ying Duan of China during day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

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Laura Robson of Great Britain reacts in her Ladies Singles first round match against Evgeniya Rodina of Russia during day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)