Twice a semi-finalist, the Serb will face Estonian qualifier Kaia Kanepi for a place in the last 32.

BBC: Serena Williams and Caroline Wozniacki make progress

The world number 24 was nursing a broken finger and lost her singles match with Kaia Kanepi on Sunday.

CNN: Injured Clijsters could miss French Open

In shape, and with the game to defeat anyone on the women's tour, Estonia's Kaia Kanepi is the tournament's dark horse.

WSJ: Australian Open Tennis: Deep Field Looks to Start Tennis Season With Grand Slam Win

She will play Kaia Kanepi of Estonia in the last eight with the other quarterfinal between Bojana Jovanovski and Petra Martic.

CNN: STORY HIGHLIGHTS

The 14th seed goes on to play Germany's Julia Goerges , who surprised 20th seed Kaia Kanepi with a 4-6 6-3 4-6 win.

BBC: Australian Open: Venus Williams labours to victory

She will face Italian Sara Errani in the semifinals Saturday while Sharapova reached that stage with a 6-2 6-4 cruise against Estonia's Kaia Kanepi.

CNN: SHARE THIS

Estonian 15th seed Kaia Kanepi suffered a 6-3 7-6 (7-4) reverse against Czech Lucie Safarova, who earned a second-round clash with Ukrainian Alona Bondarenko.

CNN: Sharapova on song as L.A. seeds tumble

Home hopes will be carried into the next round by Zheng Jie and Li Na, who play Dinara Safina and Kaia Kanepi of Estonia respectively.

CNN: Federer, Nadal and Djokovic cruise through

Sharapova will next face Estonian 23rd seed Kaia Kanepi, who upset former world No. 1 Caroline Wozniacki in round three and then beat unseeded Dutchwoman Arantxa Rus on Monday.

CNN: June 4, 2012 -- Updated 1944 GMT (0344 HKT)