"I have been playing some really great tennis this year and I feel I'm in a strong position, both physically and mentally, in the lead up to Sydney", she said.
"I don't think my story is over yet", she told Vanity Fair over the summer, when she first indicated that she wanted to come back in January.
Serena Williams and her partner Alexis Ohanian welcomed a baby daughter, Alexis Olympia.
The women's singles trophy will be presented by Billie Jean King, 50 years after she won her first Australian Open title.
"I've been No.1 for so long, so many times, and I've done things that are incredible".
Serena Williams and partner Alexis Ohanian attend a gala event before the birth of her daughter in May.
The tournament's overall prize pool will increase be 55 million Australian dollars ($42.7 million), and the men's and women's singles champions will earn $A4 million (about $3.1 million depending on exchange rates), an increase of 20 percent.
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She flew from Manila to Hong Kong on September 22 and returned to Manila on September 25 before flying to Los Angeles Tuesday. She was expected to be questioned upon her arrival in Los Angeles, the New York Times reported .
Tiley said that watching Federer and Nadal share four Grand Slam titles this year would have been painful for the Scot. "We have a player relationship that we are very proud of".
Tiley said the winners' prizemoney had broken a barrier.
"Serena is such a remarkable athlete there's now nearly an expectation she'll reach the final, as though it's a forgone conclusion", Tiley said.
The British number one has been sidelined since limping out of Wimbledon with a hip injury in July and he is unlikely to play again this year.
"The men's final between Roger and Rafa is one of the matches of the year and both players have gone from strength to strength since". The two former number 1 of the ATP tour have confirmed their presence in Melbourne after a long period of absence.
"It would be nearly unbelievable to think that Rafa has taken the No. 1 spot in tennis unless you know how driven and committed he is to not just the sport but continuously improving himself and his game".
Meanwhile, Tiley could not guarantee wayward Australian Bernard Tomic would get a start in the men's draw.
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