Big guns progress at Australian Open, while Ana Ivanovic bows out

Second seed Federer, third seed Nadal and sixth seed Andy Murray all enjoyed straight sets wins, with rising star Eugenie Bouchard also progressing on a cool Melbourne day. Seventh seed Bouchard, a semi-finalist in 2014, posted a solid 6-2, 6-4 win over Germany's Anna-Lena Friedsam.

World number two Sharapova, looking for her first Australian title since 2008, swept aside Croat Petra Martic 6-4, 6-1.

"I made a few too many unforced errors but overall I'm glad I got through," said the Russian, adding that she was reaping the benefits of a strong lead up to the tournament when she won the Brisbane International.

It was a different story for fifth seed Ivanovic, a former world No 1 who came to Melbourne full of confidence after a stellar 2014 that saw her climb the rankings.

She started well against unheralded world number 142 Lucie Hradecka of the Czech Republic, easily winning the first set, but then went to pieces, eventually crashing 1-6, 6-3, 6-2.

"I really struggled to find my rhythm today, I was just a little bit lost," said the stunned Serb. Ninth seeded German Angelique Kerber also bowed out, eliminated in three sets by Romanian Irina-Camelia Begu.