The French Open

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FILE - In this June 7, 2015 file photo, Bethanie Mattek-Sands of the U.S., right, and Lucie Safarova of the Czech Republic, left, hold the trophy after winning the women's doubles final of the French Open tennis tournament. As a professional athlete who is judicious about what she eats and drinks, Bethanie Mattek-Sands knows all too well how impossible it is to avoid the sweet aroma emanating from a stand selling waffles with a chocolate-hazelnut spread just outside the French Open's main stadium. (AP Photo/Thibault Camus, File)

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Germany's Angelique Kerber reacts after missing a shot when losing in two sets, 2-6, 2-6, against Russia's Ekaterina Makarova at the French Open tennis tournament at the Roland Garros stadium in Paris, France, Sunday, May 28, 2017. Angelique Kerber is the first women's No. 1 seed to lose in the French Open's first round in the Open era.(AP Photo/Petr David Josek)

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FILE - In this June 4, 2016, file photo, Garbine Muguruza holds the trophy after winning the women's final of the French Open tennis tournament against Serena Williams, in Paris, France. Muguruza will be competing in the French Open. (AP Photo/Alastair Grant, File)

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FILE - In this June 1, 2015, file photo, Russia's Maria Sharapova serves the ball to Lucie Safarova of the Czech Republic during a fourth round match of the French Open tennis tournament at Roland Garros Stadium in Paris, France. The highest court in sports has cut Maria Sharapova's two-year doping ban to 15 months.The decision by the Court of Arbitration for Sport means the Russian tennis star will be able to return to competition in April, in time for the French Open. (AP Photo/David Vincent, File)

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FILE - In this Sunday, June 5, 2016 file photo, Serbia's Novak Djokovic holds the trophy after winning the final of the French Open tennis tournament against Britain's Andy Murray, at the Roland Garros stadium in Paris, France. Novak Djokovic on Friday, Sept. 30 says Grand Slam trophies and the No. 1 ranking are no longer his priority. The top-ranked Serb, who has won 12 major titles, says he felt emotionally drained after winning the French Open in June for his first Grand Slam title at Roland Garros and his fourth in a row. (AP Photo/Michel Euler, file)

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Switzerland's Stan Wawrinka celebrates scoring a point in the men's final of the French Open tennis tournament against Serbia's Novak Djokovic at the Roland Garros stadium, in Paris, France, Sunday, June 7, 2015. (AP Photo/David Vincent)

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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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Serena Williams of the U.S. closes an eye as she plays compatriot Sloane Stephens of the U.S. during their fourth round match of the French Open tennis tournament at the Roland Garros stadium, Monday, June 1, 2015 in Paris. (AP Photo/Christophe Ena)

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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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Serbia's Novak Djokovic serves in the second round match of the French Open tennis tournament against Luxembourg's Gilles Muller at the Roland Garros stadium, in Paris, France, Thursday, May 28, 2015. (AP Photo/Francois Mori)

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Venus Williams of the U.S. gestures after missing a return in the first round match of the French Open tennis tournament against Sloane Stephens of the U.S. at the Roland Garros stadium, in Paris, France, Monday, May 25, 2015. (AP Photo/Michel Euler)

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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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MARIA SHARAPOVA -TENNIS Russia's Maria Sharapova poses with the trophy in front of the Eiffel Tower, one day after defeating Romania's Simona Halep in the women's final of the French Open tennis tournament in Paris, France, Sunday, June 8, 2014. (AP Photo/Michel Euler)

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Russia's Maria Sharapova returns the ball to Canada's Eugenie Bouchard during their semifinal match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Thursday, June 5, 2014. (AP Photo/Darko Vojinovic)