Novak Djokovic "looking forward" to Roger Federer clash

World number one Novak Djokovic has revealed that he is "looking forward" to facing Roger Federer in the semi-finals of Wimbledon on Friday afternoon.

Federer has won the title at SW19 seven times, while Djokovic only has one triumph in the English capital to his name.

Looking ahead to the match, defending champion Djokovic described taking on Federer as the "ultimate challenge".

"It's always a pleasure playing against Roger, so I'm looking forward to that," he told BBC Sport. "He's been so dominant and consistent in Grand Slams. It's the ultimate challenge on a grass court."

Djokovic booked his place in the final four by defeating Florian Mayer earlier today.