Federer on Masters Cup: 'I'm here to win, not just to participate'

"I feel great," Tsonga said, "stronger than at the start of the year" when he reached the Australian Open final, losing to Djokovic.

Djokovic, who dropped all three of his matches here last year and complained he was exhausted after playing a heavy schedule in his breakthrough season, said he's feeling much better this time, though his recent results -- losing in the round of 16 in his last two tournaments -- don't reflect it.

"I haven't lately found my rhythm," the Serb said. "Physically, I feel good."

Andy Roddick, who has been recuperating from injury, also said he's feeling fit, though he's looking forward to the off-season to get back in peak form. Unlike some players, he doesn't use the break to rest up, saying he starts getting itchy to do something when he has spare time.

"I was just telling my fiancee I don't know how I'll get through a honeymoon," Roddick said. "How am I going to sit still for five days?"

He also reckons he has maybe about four years of competitive-level tennis left, and that he'll miss it when he's gone.

"My bad days still are pretty good in the scheme of things," said Roddick, who's still looking for a new fulltime coach after splitting ways with Jimmy Connors.

He will play Monday against Britain's Andy Murray.