Federer: Big 4 not finished

Roger Federer believes the young challengers on the tennis circuit should not right off the 'Big Four' just yet.

The 'Big four' comprised of Federer, Rafael Nadal, Novak Djokovic and Andy Murray; had a difficult year in 2014 with age and injuries playing a part in their struggles. However, Federer, considered by some to be the greatest player in the history of the sport, says they are not out of contention just yet.

The Swiss said: "We have had some injuries, it's not because we didn't play well or that we maybe dropped a bit. Rafa had his issues, Murray had surgery on his back, I've had a tough year in '13. The only guy who was really consistent was Novak … and he took care of it and took advantage of it to some extent. He was still there when it mattered the most.

"Rafa was still there again on clay. I was consistent last year. I think Murray is on his way back. He still made the Masters, even though he didn't play so well for sometime."

He added: "I do believe there is a group of guys right there that can make a break again and can do special things. I just think it's too early to say in the season just because Novak and Rafa lost in Doha that there is something on the horizon.

"I don't read into any of those results. I think they are going to be tough to beat, and favourites for the Australian Open, to be honest."