Images from day 4
The 21-year-old said she is proud she has been able to focus on her tennis despite controversies haunting her preparations for the tournament.
"I am very pleased by winning a match like this today because a lot has been happening in the last couple of weeks off the court," Sania said.
"I was down 3-1 30-30 [in the third set] and I could have said I was just mentally not there -- it would have been a good excuse -- but I proved I am strong and hopefully I can continue to do that."
Sania said she is looking forward to her third round match with Venus Williams, having played her sister, Serena, at the same stage in Melbourne three years ago.
"I am very excited to play Venus," she said. "I have nothing to lose and feel like I am playing well. I want to try to get a good start."
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