Australian Open 2014: day five - in pictures

Serena Williams used her serve effectively during her 6-3, 6-3 win over Daniela Hantuchova and the victory meant that Williams set an all-time Australian Open record of 61 singles victories, passing the legendary Margaret Court in the history books Photograph: Jon Buckle/Press Association

David Ferrer overcame a second set fightback by Jeremy Chardy on his way into the fourth round with a 6-2, 7-6 (7-5), 6-2 victory Photograph: Clive Brunskill/Getty Images

Resurgent Casey Dellacqua equalled her best grand slam performance after dominating Zheng Jie and storming into the fourth round with a 6-2, 6-4 win Photograph: Greg Wood/AFP/Getty Images

Samantha Stosur worked up a sweat during her close fought match against Ana Ivanovic ... Photograph: Narendra Shrestha/EPA

Which Ivanovic won 6-7 (8-10), 6-4, 6-2 Photograph: Michael Dodge/Getty Images

Fans take shelter yet again from the weather, only this time it's rain rather than the unrelenting heat of the sun Photograph: Mast Irham/EPA

At times Denis Istomin must have felt like he was facing four Novak Djokovics as the defending champion raced to a 2-0 lead Photograph: Narendra Shrestha/EPA

After going 3-1 down in the third set Denis Istomin stages a comeback and takes the set to 5-5 Photograph: Andrew Brownbill/AP

Djokovic decides enough is enough and breaks Istomin before serving for, and taking, the match. Djokovic's 6-3, 6-3, 7-5 straight-sets victory means he is yet to drop a set in the tournament Photograph: Saeed Khan/AFP/Getty Images

Angelique Kerber's 6-3, 6-4 triumph over Alison Riske was much closer than the the scoreline suggests Photograph: Franck Robichon/EPA

It's not only players and fans who are having to find ways to deal with the heat. The high temperatures are causing some photographer's cameras to malfunction Photograph: David Gray/Reuters

Fourth seed Li Na came back from one set down to claim her place in the next round with a 1-6, 7-6 (7-2), 6-3 victory over 26th seed Lucie Safarova Photograph: Scott Barbour/Getty Images

Seventh seed Tomas Berdych made the fourth round in Melbourne for the fourth successive year, comfortably beating Damir Dzumhur in straight sets 6-4, 6-2, 6-2 Photograph: Rick Rycroft/AP

Richard Gasquet stretches to reach a forehand during his four set defeat to Tommy Robredo which the number 17 set won 2-6, 7-5, 6-4, 7-6 (8-6) Photograph: Scott Barbour/Getty Images

Flavia Pennetta was happy with her straight sets 6-1, 7-5 victory over Mona Barthel Photograph: David Crosling/EPA

Gael Monfils jumps the net in his first round doubles match with Dustin Brown. Unfortunatley his acrobatics couldn't help him and Brown as Pablo Carreno Busta and Guillermo Garcia-Lopez triumphed 6-4, 2-6, 6-4 Photograph: Michael Dodge/Getty Images

Not only did Lauren Davis have to deal with the heat but also dominant performance by Eugenie Bouchard who won 6-2, 6-2. Click here to check out more hot faces from Melbourne Photograph: Brandon Malone/Reuters