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Novak Djokovic of Serbia takes part in a training session for the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 10 October 2016 Stock Photo - Alamy
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Serbian tennis star Novak Djokovic takes part in a training session during the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 13 Oc Stock Photo - Alamy
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MIW Water Cooler Experts to supply the Monte Carlo Country Club with Drinking Fountains in time for the 2016 ATP Rolex Masters Tournament - MIW Water Cooler Experts
![File photo - Andy Murray plays John Isner of the United States during the Mens Singles Final on day seven of the BNP Paribas Masters at Palais Omnisports de Bercy on November File photo - Andy Murray plays John Isner of the United States during the Mens Singles Final on day seven of the BNP Paribas Masters at Palais Omnisports de Bercy on November](https://c8.alamy.com/comp/2DJT4HK/file-photo-andy-murray-plays-john-isner-of-the-united-states-during-the-mens-singles-final-on-day-seven-of-the-bnp-paribas-masters-at-palais-omnisports-de-bercy-on-november-6-2016-in-paris-france-murray-has-celebrated-his-impending-rise-to-the-world-no-1-ranking-with-a-6-3-6-74-6-4-victory-to-claim-his-maiden-paris-masters-title-and-his-eighth-tournament-win-of-the-season-andy-murray-shocked-the-tennis-world-friday-morning-in-melbourne-when-he-announced-his-plans-to-retire-this-year-during-a-tearful-press-conference-ahead-of-the-australian-open-the-former-world-no-1-had-hip-surgery-i-2DJT4HK.jpg)
File photo - Andy Murray plays John Isner of the United States during the Mens Singles Final on day seven of the BNP Paribas Masters at Palais Omnisports de Bercy on November
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Tennis - Monte Carlo Masters - Monaco, 13/04/2016. Stan Wawrinka of Switzerland plays a shot to Philipp Kohlschreiber of Germany. REUTERS/Eric Gaillard Stock Photo - Alamy
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Tennis - Monte Carlo Masters - Monaco, 12/04/2016. Grigor Dimitrov of Bulgaria plays a shot to Gilles Simon of France. REUTERS/Eric Gaillard Stock Photo - Alamy
![Serbian tennis star Novak Djokovic takes part in a training session during the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 13 Oc Stock Photo - Alamy Serbian tennis star Novak Djokovic takes part in a training session during the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 13 Oc Stock Photo - Alamy](https://c8.alamy.com/comp/W84YX4/serbian-tennis-star-novak-djokovic-takes-part-in-a-training-session-during-the-2016-shanghai-rolex-masters-tennis-tournament-in-shanghai-china-13-oc-W84YX4.jpg)
Serbian tennis star Novak Djokovic takes part in a training session during the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 13 Oc Stock Photo - Alamy
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Tennis - Monte Carlo Masters - Monaco, 14/04/2016. Jo-Wilfried Tsonga of France plays a shot to his compatriot Lucas Pouille. REUTERS/Eric Gaillard Stock Photo - Alamy
![ATP Tour on Twitter: "Career. Golden. Masters. 😲 When @djokernole won Cincinnati & became the first man to lift all nine ATP Masters 1000 titles 🏆 #NittoATPFlashback https://t.co/pD63NiwMfa" / Twitter ATP Tour on Twitter: "Career. Golden. Masters. 😲 When @djokernole won Cincinnati & became the first man to lift all nine ATP Masters 1000 titles 🏆 #NittoATPFlashback https://t.co/pD63NiwMfa" / Twitter](https://pbs.twimg.com/media/E841Es1VEAQONEy.jpg:large)