Australian Open 2012: day six – in pictures

Andy Murray cruised effortlessly into the last 16 as he crushed Michaël Llodra 6-4, 6-2, 6-0 Photograph: Jason O'Brien/Action Images Second seed Petra Kvitova comes over all shy during her match against Maria Kirilenko. The match only lasted seven games as Kirilenko had to retire because of an injury to her upper left leg Photograph: Mark Kolbe/Getty Images Number one seed Novak Djokovic had no problem overcoming Nicolas Mahut 6-0, 6-1, 6-1 Photograph: Jason O'Brien/Action Images Gael Monfils lifts a volley over the net, but his delicate skills weren't enough as Mikhail Kukushkin triumphed 6-2, 7-5, 5-7, 1-6, 6-4 Photograph: Greg Wood/AFP/Getty Images Jo-Wilfred Tsonga was overjoyed at his straight sets, 6-2, 6-2, 6-2 win over Frederico Gil Photograph: Ryan Pierse/Getty Images Serena Williams cruised into the last 16 with a 6-1, 6-1 win a Greta Arn. It was her 17th straight win at the Australian Open. The last time she lost was to Jelena Jankovic back in the 2008 quarter-finals Photograph: Ryan Pierse/Getty Images Maria Sharapova blows kisses to the crowd after her 6-1 6-2 victory over Angelique Kerber. Kerber, a semi-finalist at the US Open last year, was expected to provide the fourth seed with her first serious test of the tournament, but it never really materialised Photograph: Lucas Dawson/Getty Images Sara Errani slams a forehand to Sorana Cirstea during her 6-7, 6-0,6-2 victory Photograph: Mark Dadswell/Getty Images Wahey I've won! Lleyton Hewitt is overjoyed at coming back from a set down to see off Milos Raonic 4-6, 6-3, 7-6, 6-3 Photograph: Toby Melville/Reuters Ana Ivanovic had a straight forward straight sets, 6-3, 6-4, victory over Vania King Photograph: Torsten Blackwood/AFP/Getty Images Kei Nishikori makes a backhand return during his 4-6, 7-6, 7-6, 6-3 victory over Julien Benneteau Photograph: John Donegan/AP It's no wonder Sabine Lisicki looks happy, she's in the fourth round, courtesy of a 2-6. 6-4. 6-2 victory over Svetlana Kuznetsova Photograph: Torsten Blackwood/AFP/Getty Images