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FILE - In this file photo dated Sunday, Jan. 28, 2018, Switzerland's Roger Federer celebrates after defeating Croatia's Marin Cilic in the men's singles final at the Australian Open tennis championships in Melbourne, Australia. The 36-year-old Federer would become the oldest ever world No. 1, when the new rankings are published upcoming Monday Feb. 19, if he beats leading Dutch player Robin Haase in the ABN AMRO world tennis tournament in Rotterdam.(AP Photo/Dita Alangkara, FILE)