Can Nadal back up his No. 1 ranking?

The final Grand Slam of the year is upon us. Rafael Nadal continued to ride his Wimbledon momentum, exiting Beijing clad in Olympic gold. For the first time since the Australian Open in 2004, Roger Federer won't be the No. 1 seed.

Are the two primed to meet in a third straight Grand Slam final or is an upset inevitable? Our experts duke it out.