Serena Williams hits another heavy return as she gets Saturday under way with a not entirely straightforward win over China's Peng Shuai

Peng, who breaks Williams twice early in the second set, searches for inspiration as the American second seed steps up her game

Spain's Nicolas Almagro enters into a debate with the match referee in what turns out to be the final game of his defeat by Gael Monfils

Frenchman Monfils finds himself a spare chair and keeps an eye on proceedings from afar - before finishing off Almagro in straight sets

Maria Jose Martinez Sanchez (right) congratulates Carla Suarez Navarro, who now faces another Spaniard, Anabel Medina Garrigues

The Margaret Court Arena hosts 2006 champion Amelie Mauresmo's match against Victoria Azarenka

Belarusian Azarenka clenches her fist as she beats Mauresmo to set up a fourth-round clash with Serena Williams

Any guesses whose signature that is? French star Gilles Simon scrawls on the hand of a lucky spectator in Melbourne

Alona Bondarenko of Ukraine recovers from a poor start to earn three set points against Svetlana Kuznetsova of Russia

However, former US Open champion and world number eight Kuznetsova holds her nerve to see off Bondarenko in straight sets

Fifth seed Jo-Wilfried Tsonga gets intimate as it looks like another of the Australian Open's French contenders will march on

And last year's finalist Tsonga has too much power and athleticism for Dudi Sela and comes through in four sets

American James Blake, seeded nine, beats Igor Andreev in four sets to set up a clash with Tsonga

British number four seed Andy Murray demonstrates his new-found focus to win the first set against Austria's Jurgen Melzer 7-5

World number 32 Melzer is blown away in the second set as Murray goes on a winning streak of 11 straight games

Murray completes a straightforward victory to progress to the fourth round, where he will play Spanish number 14 seed Fernando Verdasco

Richard Gasquet of France races into a two-set lead against Chile's 14th seed Fernando Gonzalez

However, Gonzalez takes the next two sets before winning a monumental decider 12-10 to set up a clash with Rafael Nadal

Top seed Nadal repels everything Germany's Tommy Haas can throw at him in his third-round encounter

Nadal, gunning for his first Australian Open crown, crushes Haas in straight sets and will be confident of defeating a fatigued Gonzalez