Djokovic rallies at Rome Masters, adds clay title to resume

Djokovic is already on top of the ATP Race rankings, which coincide with the actual rankings at the end of the year.

Djokovic, who will turn 21 later this month, has been winning more than Nadal and top-ranked Roger Federer lately. He reached his first Grand Slam final at the U.S. Open to end 2007, and has followed his win at Melbourne by taking two of the four Masters Series events so far this year.

Nadal was upset by Juan Carlos Ferrero in the second round in Rome, and Federer fell to Radek Stepanek in the quarterfinals.

"Everybody got used to Federer and Nadal playing the finals of every major event," Djokovic said. "Mentally, they're struggling because there is so much pressure and so much expectation that they have to be in the final on every surface and in every tournament that they play."

Djokovic faced pressure Sunday as the favorite against Wawrinka, who was playing his first Masters Series final.

"If I really want to stay on the top of men's tennis, I need to get used to those things," Djokovic said.