The start of the second week of the 2013 Australian Open started with an upset in the women's singles competition after Russian Svetlana Kuzentsova eliminated former world No 1 Caroline Wozniacki . The unseeded Russian beat the Dane in three sets, winning the third 7-5.
Kuznetsova, the 2004 US Open and 2009 French Open champion, was once ranked No 2 in the world but has now slipped to 75. She will play reigning world No 1 and top seed Victoria Azarenka in the quarter-finals; the Belarusian barely broke a sweat in dispatching Elena Vesnina of Russia 6-1, 6-1.
Elsewhere in the women's event, American Sloane Stephens  beat Serbia's Bojana Jovanovski in three sets, and will face one of either Serena Williams  or Maria Kirilenko . Williams is a five-time Australian Open champion.
The remaining quarter-final match-ups have already been decided, with Na Li  of China to face fourth seed Agnieszka Radwanska of Poland and Russia's Maria Sharapova  to play compatriot Ekaterina Makarova . The winners of these two matches will play each other in the semi-final, with Williams and Azarenka favourites to advance to the second semi-final.
Meanwhile, in the men's singles competition, Italian Andreas Seppi  was beaten 5-7, 6-3, 6-2, 6-2 by unseeded Frenchman Jeremy Chardy. The 25-year-old Chardy will face the winner of the fourth round match between compatriot Gilles Simon  and Britain's No 1, Andy Murray .
The other quarter-finals in the men's event will feature world No 1 Novak Djokovic against the Czech Republic's Tomas Berdych . Djokovic pulled off an epic five set win over Stanislas Wawrinka  of Switzerland and won the final set 12-10 in a match that lasted over five hours. Berdych, on the other hand, had a relatively easier match against South Africa's Kevin Anderson, beating him 6-3, 6-2, 7(15)-6(13).
Spain's David Ferrer  and Nicolas Almagro  will square off against each other in the second quarter-final, with the winner set to face one of either Djokovic or Berdych.
And one of the two final quarter-finalists will be France's Jo-Wilfired Tsonga , the 2008 Australian Open finalist, after he beat compatriot and ninth seed Richard Gasquet in four sets. Tsonga is set to play the winner of the match between former world No 1 and record Grand Slam winner Roger Federer  and Canada's Milos Raonic .
Both Murray and Federer are scheduled to play their fourth round matches on Monday; click here to find out where to watch the 2013 Australian Open live in the UK.