Third seed Ana Ivanovic takes on Venus Williams for a place in the women's semi-finals

Williams, the former world number one, has problems with her serve as she loses the first set

Ivanovic feels the heat at the start of the second set as Williams ups her game and moves 3-0 ahead

Mistakes start to creep back into the Williams' game as she is reeled back in by the 20-year-old Serb

Ivanovic raises her game again and celebrates after clinching a thrilling victory on the Rod Laver Arena

Ninth seed Daniela Hantuchova is up against Polish teenager Agnieszka Radwansk in her quarter-final match

Radwanska hopes for a repeat of her third-round win over second seed Svetlana Kuznetsova

But the Polish teenager cannot compete with Hantuchova's power, and the Slovakian will play Ivanovic in the last-four

Crowd favourite Novak Djokovic faces Spain's David Ferrer for a place in the men's semi-finals

Ferrer makes a terrible start and loses the first set 6-0 in just 23 minutes

Djokovic runs away with the second set too but suffers a bout of nerves at 5-3 up in the third

Ferrer, the men's fifth seed, belatedly rediscovers his form and threatens a comeback against the tiring Serb

But Djokovic steadies himself before closing out an impressive win at the Rod Laver Arena to reach the last-four

Reigning champion Roger Federer was back to take on James Blake in the last quarter-final

Blake played close to his peak but went two sets down as Federer stepped on the gas

Fans of Federer were left smiling as their man cruised through in straight sets to a semi-final meeting with Djokovic