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)
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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)
