London, June 24 (ANI): Swiss tennis ace Roger Federer has warned Novak Djokovic and Rafael Nadal to watch their backs, ahead of their clash in Wimbledon 2012.

The Serb and the Spaniard have gone to battle in the last four Grand Slam finals.

Swiss legend Federer, a six-time winner would kick off the mega tennis tournament tomorrow against Spain's Albert Ramos.

It's up to somebody else to break that mould, The Sun quoted Federer, as saying.

They have done amazingly well in the last few years. Hopefully it's my time now. I fancy my chances. I'm dreaming of the title, he added. (ANI)