MELBOURNE (Reuters) - Roger Federer and Maria Sharapova glittered under the Rod Laver Arena lights on Monday, restoring order at the Australian Open after eight women's seeds crashed out on a manic opening day.

Federer strolled into the second round with a classy 6-4, 6-2, 7-5 win over Taiwan's Lu Yen-hsun before fellow second seed Sharapova ruined Croatian qualifier Petra Martic's 24th birthday with a 6-4, 6-1 victory.

Rafa Nadal and Andy Murray also enjoyed comfortable wins as three of the men's Big Four shook out the early-season rust.

Although the retired Li Na is not defending her singles title, the glowing Chinese stole the spotlight from the players when she announced she was expecting her first child with husband and former coach Jiang Shan.

"I think Dennis (Jiang) is doing a good job. He just made one ace," said the 32-year-old crowd favourite in the Rod Laver Arena, sparking cheers from the terraces.