( CNN ) -- Former world number one Venus Williams came through an injury scare to defeat Sandra Zahlavova 6-7 6-0 6-4 , in the second-round of the Australian Open on Wednesday . The fourth-seed Williams had not lost a set to the Czech in any of their four previous meetings , but Zahlavova remedied that when she claimed the first thanks to a tie break . After falling behind , the 30-year-old Williams required treatment in the locker room after picking up a groin injury and returned with the area heavily strapped to win the final two sets of the match . Williams , who is playing in only her second tournament since the 2010 Wimbledon championships after struggling with a knee injury , recorded her win in three hours and one minute . `` I was n't very happy , to say the least , '' the American said of her injury on the tournament 's website . `` I mean , with an injury like that , you just do n't know what to expect . I think what keeps me going is knowing that when I 'm healthy I play really , really well and knowing that I have so much good tennis in my body keeps me motivated . '' The seven-time grand slam winner -- who wowed the crowds with another head-turning outfit -- will face Germany 's Andrea Petkovic in the third round after the 30th seed also came from behind to defeat Britain 's Anne Keothavong 2-6 7-5 6-0 . The fashion verve of Venus Williams . Top-seed Caroline Wozniacki and 2004 champion Justine Henin had less complicated second rounds , with both winning in straight sets . World number one Wozniacki dispatched America 's Vania King in under an hour with a 6-1 6-0 win . `` I was playing aggressively , '' the Dane told the WTA Tour 's website . `` I took the balls early and made her run , and had a couple of good net approaches . In general I played solid . '' Wozniacki will next play Dominika Cibulkova , the Slovakian who beat her in Sydney last week . Cibulkova eliminated Alberta Brianti of Italy 6-1 4-6 6-2 . Belgian Henin , seeded 11th , beat British number one Elena Baltacha 6-1 6-3 at the Rod Laver Arena . The 28-year-old Henin has won seven majors and overcame Baltacha in 61 minutes , despite being troubled by an elbow injury . The Australian Open should be in February ! Henin 's next opponent will be former French and U.S. Open champion Svetlana Kuznetsova of Russia . Kuznetsova , 25 , ended the hopes of Dutch qualifier Arantxa Rus with a 6-1 6-4 win on Show Court Two . Russia 's Maria Sharapova is into the next round after a hard-fought 7-6 ( 7-3 ) , 6-3 success over Virginie Razzano . Sharapova , a champion at Melbourne Park in 2008 , lost the opening three games of the match to her French opponent but bounced back to seal victory in little over two hours . `` Looking back , obviously you want to play faster matches with an easier score line , '' Sharapova , 23 , said . `` That would be great , but it 's also good to play these types of matches where you 're put in a situation where you have to find a way to win , especially when your opponent is playing really well . '' The 14th seed will meet 22-year-old Julia Goerges in the last 32 after the German eliminated 20th-seed Kaia Kanepi 6-4 3-6 6-4 .
Venus Williams recovers from one - set down to beat Sandra Zahlavova in Australia . Caroline Wozniacki is also through after a straight - sets win at Australian Open . Justine Henin beats British number one Elena Baltacha in 90 minutes .