Williams is 95th in the world rankings
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Seven-time Grand Slam winner Serena Williams says she has "no doubt" she will be world number one again after a string of knee and ankle injuries.
The American, who is preparing for the Australian Open, is confident she will reverse her injury-enforced slide to 95th in the world rankings.
"There's no doubt about it. It's just a matter of time. I'm definitely on my way," said the 25-year-old.
Williams has won the Australian Open twice, in 2003 and 2005.
The first-round draw for this year's tournament takes place on 12 January, with the action starting on 15 January.
Williams is preparing for the tournament by competing in the Hobart International in Tasmania, where her first-round opponent is Sweden's Sofia Arvidsson.
The Hobart International is one of several events in Australia this week which act as warm-ups for the Melbourne tournament.
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