I'm not talking about the Race, though. I'm talking actual rankings. Murray and Djoker have a lot to defend. Nadal has absolutely nothing. And we still have 4 Masters events, the USO, and the WTF, and a ton of 500 events. If I recall correctly, Nadal has only won 2 of those so far, so he still has 2 more he can add to his year. All that has to happen is Nadal has to win a few of the Master's, put in a decent run at the USO and WTF, and have Djoker upset a round or two earlier than he did last year and Nadal will take the number 1 from him.