Roger Federer

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Roger Federer, of Switzerland, celebrates after beating Rafael Nadal, of Spain, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Roger Federer, of Switzerland, returns a shot against Rafael Nadal, of Spain, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Rafael Nadal, of Spain, serves to Roger Federer, of Switzerland, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Roger Federer, of Switzerland, returns a shot to Rafael Nadal, of Spain, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Roger Federer, of Switzerland, returns a shot to Steve Johnson at the BNP Paribas Open tennis tournament, Tuesday, March 14, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Steve Johnson returns a shot to Roger Federer, of Switzerland, at the BNP Paribas Open tennis tournament, Tuesday, March 14, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Roger Federer, of Switzerland, returns a shot against Steve Johnson at the BNP Paribas Open tennis tournament, Tuesday, March 14, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Switzerland's tennis player Roger Federer, right, returns a ball to Czech Republic's Tomas Berdych, left, during an exhibition match on Vltava river in Prague, Czech Republic, Monday, Feb. 20, 2017. Federer arrived in Prague to promote the Laver Cup, a tournament that will be held in Prague on Sept. 22-24, 2017, pitting six top European players against their counterparts from the rest of the world. The Charles Bridge and he Prague Castle are in the background. (AP Photo/Petr David Josek)

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Switzerland's tennis player Roger Federer arrives to greet his fans at the Old Town Square in Prague, Czech Republic, Monday, Feb. 20, 2017. Federer arrived in Prague to promote the Laver Cup, a tournament that will be held in Prague on Sept. 22 to24, 2017, pitting six top European players against their counterparts from the rest of the world. (AP Photo/Petr David Josek)

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Roger Federer - his accomplishments in professional tennis have led to him being regarded by many as the greatest tennis player of all time. Federer turned professional in 1998 and has been continuously ranked in the top 10 since October 2002. Federer holds several records of the Open Era: holding the world No. 1 position for 302 weeks (including 237 consecutive weeks); winning 17 Grand Slam singles titles; reaching each Grand Slam final at least five times (an all-time record); and reaching the Wimbledon final ten times. He is among the eight men (and among the five in Open Era) to capture a career Grand Slam. Federer shares an Open Era record for most titles at Wimbledon with Pete Sampras (seven) and at the US Open with Jimmy Connors and Sampras (five). He is the only male player to win five consecutive US Open titles. (AP Photo)

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FILE - In this July 8, 2016, file photo, Roger Federer of Switzerland receives medical attention during his men's semifinal singles match against Milos Raonic of Canada at the Wimbledon Tennis Championships in London. Federer says he will miss the Rio Olympics and the rest of the tennis season to protect his surgically repaired left knee. Federer writes Tuesday, July 26, 2016, on his Facebook page that he will skip the Summer Games, where the tennis competition starts next week, and has been advised by doctors to remain sidelined for the remainder of 2016. (AP Photo/Alastair Grant, File) **FILE**

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Roger Federer of Switzerland celebrates a point win against Tomas Berdych of the Czech Republic during their quarterfinal match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 26, 2016.(AP Photo/Andrew Brownbill)

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Roger Federer of Switzerland celebrates after defeating Alexandr Dolgopolov of Ukraine in their second round match at the Australian Open tennis championships in Melbourne, Australia, Wednesday, Jan. 20, 2016.(AP Photo/Vincent Thian)

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Roger Federer of Switzerland takes a drink during his first round match against Nikoloz Basilashvili of Georgia at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 18, 2016.(AP Photo/Vincent Thian)

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Switzerland's Roger Federer misses a return in the quarterfinal match of the French Open tennis tournament against compatriot Stan Wawrinka who won in three sets 6-4, 6-3, 7-6 (7-4), at the Roland Garros stadium, in Paris, France, Tuesday, June 2, 2015. (AP Photo/Francois Mori)

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France's Gael Monfils plays a shot in his fourth round match of the French Open tennis tournament against Switzerland's Roger Federer at the Roland Garros stadium, in Paris, France, Sunday, May 31, 2015. (AP Photo/Francois Mori)

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France's Gael Monfils returns the ball to Switzerland's Roger Federer during their fourth round match of the French Open tennis tournament at the Roland Garros stadium, Sunday, May 31, 2015 in Paris. (AP Photo/Francois Mori)

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A boy who climbed down from the stands takes a selfie with Switzerland's Roger Federer in the first round match of the French Open tennis tournament against Colombia's Alejandro Falla at the Roland Garros stadium, in Paris, France, Sunday, May 24, 2015. (AP Photo/David Vincent)

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Tennis great Roger Federer (left) and director Quentin Tarantino.

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Switzerland’s Roger Federer celebrates winning his ATP World Tour Finals semifinal tennis match against his compatriot Stan Wawrinka at the O2 Arena in London, England, Saturday, Nov. 15, 2014. (AP Photo/Tim Ireland)