Three-times former champion Martina Hingis takes on China's Li Na in the opening match on Rod Laver Arena

Despite losing the first set, Hingis comes out smiling as Li loses her way in an error-strewn match

Bob and Mike Bryan perform their trademark 'chest bump' as the American twins move into the quarter-finals

Fourth seed Kim Clijsters will face Hingis in the quarter-finals after beating Daniela Hantuchova in straight sets

Slovakian Hantuchova rallies from 3-0 down in the second set but eventually succumbs 6-1 7-5

Russia's Anna Chakvetadze celebrates reaching her first Grand Slam quarter-final after beating eighth seed Patty Schnyder

Fernando Gonzalez stuns fifth seed James Blake 7-5 6-4 7-6 (7-4) to reach the quarter-finals for the first time

David Nalbandian's Australian Open hopes end as he is beaten 4-6 6-3 6-2 6-3 by Tommy Haas

Russia's Nikolay Davydenko defeats Czech 13th seed Tomas Berdych to set up a clash with Haas

Russian top seed Maria Sharapova takes the opening set 7-5 against compatriot Vera Zvonareva

Sharapova proves to be too strong for her opponent and eventually wraps up a 7-5 6-4 win to progress to round five

Andy Murray is in fine form as he takes the first set from world number two Rafael Nadal in their late night encounter

Nadal trails 4-1 in the second set but stuns the Scot as he wins five games in a row to level the match

Murray shrugs off the disappointment and regains his form and composure to win an enthralling third set 6-4

But the game isn't not over yet, Nadal roars back to clinch the fourth set to force the game into a decider

After a gruelling three hours and 52 minutes of mind-bogglingly good tennis, Nadal finally defeats Murray