Shanghai, Oct 17 (IANS): Coming off his record sixth title in Beijing, world number one Novak Djokovic is playing in a class of his own and now he is looking to win back-to-back double in the Shanghai Rolex Masters.

Djokovic appears to be making his way through the draw all but unopposed in Shanghai, making into the semifinals after edging past Aussie Bernard Tomic 7-6(6), 6-1 here on Friday, Xinhua reported.

So what's the secret?

"There is no secret," insisted Djokovic. "I guess it depends how you feel on a given day, depends how well your opponent is playing, how well you're playing. It's a combination of things," he said.

"You can't just expect to win all the time very comfortably, but I've been doing that so for the last week and a half. Obviously, it's giving me more confidence. Any time I come back to the court, I feel good and I start off well," he added.

Defending Shanghai Masters champion Roger Federer was ousted in the opening round. Andy Murray, Rafael Nadal, Stan Wawrinka and Tomas Berdych all played three sets, but the Serb has now won 15 straight matches and 18 straight sets dating back to his title run at the China Open.

Djokovic is a seeking his career-high 13th straight final since falling in the quarterfinals in Doha to start the year. The last player to reach 10 or more consecutive finals in a season was Federer.