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Meanwhile, 2010 French Open champion Italia's Francesca Schiavone beat 30th seed Russian Svetlana Kuznetsova 4-6 6-1 14-16 in a four hours and 44 minutes fourth round match, breaking the tournament's longest women's single record.?? The pair has broken Barbora Zahlavova Strycova and Regina Kulikova's record on the longest women's Gland Slam match, where Strycova spent four hours and 19 minutes to beat Kulikova in 2010 Australian Open.
The pressure both players felt was incredible, Schiavone later likening every match to a match point.
"It's like every points are match point. You have to keep going. You know that physically you are tired, but the other one, too," She told reporters in Melbourne after the long-lasting match.
Schiavone will face Wozniacki in the quarter-final.
China's top player Li Na defeating the 8th seed Victoria Azarenka in straight sets 6-3, 6-3 in the fourth round to breezed into last eight taking one step closer to becoming the first Chinese Grand Slam champion.
The 9th seed Li converted five of the six break points to seal the victory in one hour and 24 minutes, extending her winning streak to nine matches in the new season, which is the best record of all Women's Tennis Association (WTA) players.
It is the second time for Li to take a top eight spot at least in Melbourne after finishing at semi-final stage last year.
"This is a dream for me," Li told reporters in Melbourne, referring to a possible first major title here. "I mean, until now I still just follow the dream. I mean, like last year, I need two more steps. So hopefully this year I can do better."
30th seed German rising star Andrea Petkovic defeated 16th seed Russian Maria Sharapova 6-2 6-3 in one hour and 19 minutes.
Petkovic is the first German to advance to the quarter-final at Australian Open since 1999, and she will next face a very tough match against Li Na.