Nadal, Djokovic and Murray hail retiring Laver Cup teammate Federer

Tennis titans Novak Djokovic, Rafael Nadal and Andy Murray on Thursday paid tribute to Roger Federer who is set to play the final game of his illustrious career during the Laver Cup tournament in London.

Federer, 41, who has been plagued by knee injuries over the past three years, announced his retirement last Thursday.

The Swiss said the three-day event at the 02 Arena in south-east London would be his las