Men's game not a one-horse race: Federer

 Novak Djokovic deserves a "little star" next to his name for a spectacular 2015 season that saw him win three Grand Slams among his 11 titles but the men's game is not simply a matter of the Serb versus the rest, Roger Federer said on Saturday.

The world number one's dominance has seen pundits line up to declare the end of the 'Big Four' -- suggesting Federer, Rafael Nadal and Andy Murray are unable to compete on equal terms at Grand Slams with Djokovic.

The Serb heads into the Australian Open a raging favourite to capture his sixth title at Melbourne Park but Federer gave short shrift to talk of a Djokovic dictatorship, pointing to Stanislas Wawrinka's victory over him in the French Open final.

"It completely depends what you're looking at. If you're looking at (Djokovic's) season, he was the most dominant player by far last year," Federer told reporters at Melbourne Park.

"Then if you look at just who won the Slams and the Masters 1000s, doesn't hold truth, because Stan won the French.

"Who's had the most success? The top five guys really, with Stan, you know, Murray, myself, Novak and Rafa.

"Now the rankings are back to more normal again after Rafa's worked his way back up.

"Yeah, I still think the same guys are playing very well. But, of course, Novak deserves like a little star next to his name right now because he's been doing extremely well.”

I’m fit, declares Serena

Serena Williams brushed off concerns about her fitness on Saturday and declared herself "at 130 percent" for her Australian Open title defence.

The 21-times Grand Slam singles champion has played almost no competitive tennis since the US Open last September and pulled out of the Hopman Cup two weeks ago with knee inflammation. Pictures of the 34-year-old taking a time-out during training circulated on social media on Saturday, raising concerns she might not be fit to take on Camila Giorgi in the first round at Melbourne Park on Monday or Tuesday.

Williams, though, said the knee inflammation was no longer a problem -- "it's actually really fine" -- and any issues she had on the practice courts were simply the result of her heavy training workload.

"I'm a little tired today. I've been working so hard and doing so much work, so ... maybe I had a bad attitude out there," the world number one and top seed told reporters.

"I'm at 120, 130 percent right now ... I actually wanted to have an easy day today. But to me in my mind 'easy' is just two hours of really intense working out."