Roger Federer on his desire to get the No. 1 ranking back from Rafael Nadal: "Sure, it's going to be challenging. It's going to be very difficult because Rafa is playing well and I have to defend ...

Roger Federer, Rafael Nadal and Andy Murray spoke to reporters at roundtable press conferences ahead of the Barclays Tennis Championships in Dubai. "I'm not sure about that yet. It was quite tough ...