21 January 2014 Last updated at 08:04 GMT

Andy Murray over back problem - Ivan Lendl

Coach Ivan Lendl says Andy Murray has fully recovered from back surgery and is ready to compete with the world's best tennis players.

Murray will face Roger Federer in the quarter-finals of the Australian Open, and Lendl believes the Scot has played enough matches since undergoing back surgery in September for his fitness to no longer be an issue.