World number one, Roger Federer, has pinpointed Andy Murray as a major threat to his position at the top of the world rankings.
Since lifting his maiden major title at the US Open in September, Murray has spoken of his desire to add more Grand Slams to his trophy cabinet and has targeted a more consistent 2013, with the hope of leapfrogging the Swiss at the summit.
Federer feels the Scot can hit his targets,
admitting to the sport news that he will have a keen eye on...