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Roger Federer, left, from Switzerland hugs ten-year-old singer Chelsea, right, who performed a song by Tina Turner, prior to Federer's Tennis exhibition "Match for Africa 2" against his compatriot Stanislas Wawrinka in the Hallenstadion Stadium in Zurich, Switzerland, Sunday, 21 December 2014. The two Swiss tennis players compete in the charity event for the "Roger Federer Foundation" to raise money for the education of African children. (KEYSTONE/Walter Bieri)