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Swiss tennis player Roger Federer, right, and tennis player Andy Murray, of Britain, left, play on a raft in Zurich, Switzerland, 10 April 2017. Federer and Murray play a charity game 'Match for Africa 3' on 10 April 2017. The charity event for the 'Roger Federer Foundation' raises money for African children. (KEYSTONE/Nathan Klinkspoor)