Australian Open 2012: day five – in pictures

Rafael Nadal hardly had time to work up a sweat as it only took him just under two hours to easily overcome Lukas Lacko 6-2, 6-4, 6-2 Photograph: Jason O'Brien/Action Images

Roger Federer, who was making his 53rd consecutive appearance in the Rod Laver Arena, had a similarly straight forward match as he beat Ivo Karlovic 7-6, 7-5, 6-3 Photograph: Cameron Spencer/Getty Images

Caroline Wozniacki stretches to reach a shot by Monica Niculescu but the number one seed found little else to trouble her during her 6-2, 6-2 victory Photograph: Daniel Munoz/Reuters

A German fan smiles during her compatriot Philipp Kohlschreiber's 6-3, 6-2, 7-6 win over Alejandro Falla Photograph: Mast Irham/EPA

Kim Clijsters had a straight forward 6-3, 6-2 victory over Daniela Hantuchova as she continues her march to retaining her title Photograph: Sarah Ivey/AP

Thirteenth seed Jelena Jankovic had little trouble overcoming the unseeded Christina McHale 6-2, 6-0 Photograph: Scott Barbour/Getty Images

Juan Martín del Potro had a straight sets 6-2, 6-3, 6-0 victory over Lu Yen-Hsun Photograph: Jason O'Brien/Action Images

Bernard Tomic had to cover a lot of the court during his five-set victory over Alexandr Dolgopolov. The unseeded Australian overcame the No13 seed 4-6, 7-6, 7-6, 2-6, 6-3 Photograph: Mark Blinch/Reuters

Victoria Azarenka progressed into the fourth round despite a late outburst at a line judge that marred her 6-2, 6-4 win against Mona Barthel Photograph: Nicolas Asfouri/AFP/Getty Images

Feliciano López hits his sweatbands into the crowd as he celebrates his five-set victory over John Isner. It was a see-saw of a match which saw the 18th seed triumph 6-3, 6-7, 6-4, 6-7, 6-1 Photograph: How Hwee Young/EPA

Tennis, and fashion, fans will no longer be able to see Galina Voskoboeva's rather fine ruffled design in the singles tournament after she lost 6-2, 6-2 to Agnieszka Radwanska. However they'll still be able to see the dress in the women's doubles as Galina and partner Su-Wei Hsieh are in the second round Photograph: Barbara Walton/EPA

Tomas Berdych is flying high as he beats Kevin Anderson 7-6, 7-6, 6-1 Photograph: William West/AFP/Getty Images

There's no finer thing than the love between a tennis player and their racket as Nicolas Almagro shows after he beat Stanislas Wawrinka 7-6, 6-2, 6-4 Photograph: Torsten Blackwood/AFP/Getty Images