Federer ready to challenge Djokovic for world No1 ranking

London: Fresh after a month long break Roger Federer is ready to challenge Novak Djokovic for the world No1 ranking.

The third-ranked Federer is set to return to action at the Madrid Open, a tournament he won in 2006 and 2009, The Mirror reports.

Federer said: "I am excited to be back after a long off-season, but I needed it after playing so, so much. I have put myself in a good position if I do win a grand slam for the world number one."

The 30-year-old Swiss called Spaniard Rafael Nadal the tournament favorite, while postponing judgment on the event``s new blue-clay surface.

"It feels different. I haven``t had a chance to play on center court yet, so I``ll have to wait until a proper match to give you my opinion," he said.