Djokovic’s fellow Serb Ivanovic booked her quarter final with Venus by ousting Caroline Wozniacki 6-1, 7-6. The world number three has not lost a set during the tournament and is relishing the prospect of playing the American.

“She’s definitely a tough opponent. Last two Grand Slams I lost to her. Exactly the time for some revenge,” she smiled.

Williams advanced with a routine 6-4, 6-4 victory over talented Polish qualifier Marta Domachowska.

Agnieszka Radwanska became the first Polish woman to reach a Grand Slam quarter final when she came from a set and 3-0 down to beat an ailing Nadia Petrova.

Russian 14th seed Petrova led 6-1, 3-0 but a groin strain hampered her movement in the third set and Radwanska stormed back to win 1-6, 7-5, 6-0 and set up a clash with ninth seed Daniela Hantuchova of Slovakia.

The 18-year-old Radwanska is the youngest of the eight quarter finalists.

Slovak Hantuchova recovered from a slow start to beat Russian Maria Kirilenko 1-6, 6-4, 6-4.