Swiss tennis superstar Roger Federer (right) returns to Britain’s Andy Murray during a training session on a raft on the Limmat river ahead of a charity match in Zurich, Switzerland yesterday. Pic/AFP

Zurich (Switzerland): Swiss tennis legend Roger Federer and Briton Andy Murray trained on a raft floating on the Limmat river in this Swiss city of Zurich yesterday to promote the "Match for Africa 3" to raise money for African children.