BASEL (AFP) - Novak Djokovic crushed Lukasz Kubot 6-1, 6-2 as the top seed at the Swiss Indoors showed on Thursday that his untouchable form is rapidly returning after six weeks out with injury. Djokovic, who had to struggle in his opening match over three sets, was absolutely untroubled by the Polish qualifier ranked 64th in the world, going through to the quarter-finals in just 54 minutes. "Today was a really comfortable match," said the world number one. "I felt good on court. I'm happy to be playing better. "This was the goal, I expected that I would struggle with rhythm after not playing for six weeks. But I have no complaints with my game. It was a good performance and I'll try to do better tomorrow (Friday)." Djokovic lifted his impressive 2011 record to 66 wins and three defeats as he won again after overcoming a back injury that he called the worst of his career. "I'm not 100 percent and to be honest I don't expect to get there this week, I would be surprised if I did. I only started serving a few days before my first match and I could tell I was lacking rhythm on second serve. But it was getting better today. I need to stay positive and increase the rhythm and intensity of each match." Champion in 2009 and a losing finalist against Roger Federer in 2010, Djokovic will now face Cypriot Marcos Baghdatis, who booked his last eight ticket on Wednesday. Elsewhere Thursday, seventh seed Andy Roddick lost serve three times in the first set but recovered to put out Czech Radek Stepanek 2-6, 6-3, 6-3. The victory moves Roddick into a quarter-final with four-time champion Roger Federer. The pair last met in the semi-finals here a year ago with the Swiss winning in straight sets. The quarter-final will be their fourth meeting in Federer's hometown since 2001. "It is what it is," Roddick said of the contest. "There won't be any surprises, neither of us are likely to worry.