Back on top of the world —
Having steadily climbed back up the rankings throughout 2013, Nadal returned to the No. 1 spot in unwanted circumstances -- after Tomas Berdych retired through injury in the semifinals of October's China Open. "(This is) one of the best years of my career without any doubt," Nadal said later. "It sure is special to be back to the top position of the rankings after more than a half year without playing tennis."