17 January 2014 Last updated at 10:03 GMT

Australian Open: Martina Navratilova on Andy Murray

Martina Navratilova speaks to BBC Sport about the challenges facing British number one Andy Murray, the favourites for the men's and women's titles and the searing temperatures at the Australian Open.

The tennis legend says it will be "difficult" for Murray to return from injury to beat the likes of Novak Djokovic and world number one Rafael Nadal, but that the Scot has the "ability" to do so.

Navratilova, an 18-time Grand Slam champion, believes that the women's tournament is Serena Williams's to lose, adding that the American "doesn't have to play her best to win".