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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