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Australian Open 2007 - Day 5

Serena Williams revived memories of her two Australian Open titles by coming from a set and a break down to beat Russian fifth seed Nadia Petrova 4-6, 7-5, 6-3 and book a place in the fourth round on Friday.

Williams, champion in 2003 and 2005, looked to be a spent force as Petrova won the first set and recovered from 3-1 down in the second to serve for it at 5-4.

But Williams, unseeded after a catalogue of injuries blighted her 2006 campaign, broke back and won the second before breaking in game six of the decider to set up victory in two hours and five minutes on Rod Laver Arena.