Tennis: day five of the Australian Open

British hopeful Andy Murray faced Frenchman Florent Serra in the third round today Photograph: Julian Abram Wainwright/EPA Photograph: Julian Abram Wainwright/guardian.co.uk Murray eased to a 3-0 lead in the first set but lacked conviction thereafter and struggled before finally taking the set with a 7-5 victory Photograph: Jon Buckle/PA Photograph: Jon Buckle/guardian.co.uk The Scot made light work of the second set, dropping just one game Photograph: Ryan Pierse/Getty Images Photograph: Ryan Pierse/guardian.co.uk And took the third set 6-4 to book a place against the 6ft 9in American John Isner in the next round Photograph: Paul Crock/AFP/Getty Images Photograph: Paul Crock/guardian.co.uk Laura Robson was back in doubles action with Sally Peers ... and the pair enjoyed a surpising win over 12th seeds Chia-Jung Chuang and Kveta Peschke Photograph: Jon Buckle/PA Photograph: Jon Buckle/guardian.co.uk However, Britain's Elena Baltacha produced a disappointing performance against Dinara Safina, losing 6-1, 6-2 to the second seed Photograph: Jason O'Brien/Action Images Photograph: Jason O'Brien/guardian.co.uk Rafael Nadal was drawn against Philipp Kohlschreiber of Germany Photograph: William West/AFP/Getty Images Photograph: William West/guardian.co.uk Kohlschreiber fought valiantly, winning the third set, but eventually lost 6-4 6-2 2-6 7-5 Photograph: Joe Castro/EPA Photograph: Joe Castro/guardian.co.uk Fur from the tennis balls sticks to the court as Ivo Karlovic of Croatia serves to his compatriot Ivan Ljubicic in their third round match. Karlovic won in four sets Photograph: Paul Miller/EPA Photograph: Paul Miller/guardian.co.uk The biggest shock of the day was the exit of Kim Clijsters, who was beaten emphatically 6-0, 6-1 by Nadia Petrova of Russia Photograph: Andy Wong/AP Photograph: Andy Wong/guardian.co.uk