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Switzerland's Roger Federer and Stan Wawrinka hug after their quarterfinal match of the French Open tennis tournament which Federer won in four sets, 7-6 (7-4), 4-6, 7-6 (7-5), 6-4, at the Roland Garros stadium in Paris, Tuesday, June 4, 2019. (AP Photo/Jean-Francois Badias)