Meanwhile, Bernard Tomic boosted his hopes of a strong performance in his home grand slam by winning the men's title in Sydney -- his first on the ATP Tour.
The 20-year-old, who had a disappointing 2012 season, will return to the top 50 following Saturday's 6-3 6-7 (2-7) 6-3 victory over 36th-ranked South African Kevin Anderson.
He also beat world No. 1 Novak Djokovic as he won all three singles matches at the Hopman Cup mxed teams warmup event in Perth earlier this month.
"Now that I know what it feels like to win a tournament and it's the best feeling in the world," Tomic said.
"I'm looking forward to Melbourne. I feel unstoppable."
Veteran Australian Lleyton Hewitt is also in form ahead of Melbourne, having won the Kooyong Classic exhibition.
The former world No. 1 beat world No. 7 Juan Martin del Potro on Saturday, having earlier defeated sixth-ranked Tomas Berdych and No. 15 Milos Raonic.
Now back up to 82nd in the rankings after falling out of the top 200, the 2005 Australian Open runner-up will play ninth-ranked Janko Tipsarevic in his opening match.
"I'm extremely happy with how I'm hitting the ball at the moment, and a lot of the pressure's on him," Hewitt said of the Serbian, who has suffered wrist problems since winning the Chennai Open in India this month.
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