Pakistan, Jan. 21 -- Jannik Sinner barely broke sweat in launching his quest to win a third Australian Open in a row on Tuesday as Naomi Osaka stole the show with a bold fashion statement.

Popular Frenchman Gael Monfils meanwhile bid farewell to Melbourne Park with an epic defeat and thanks for "an amazing ride".

The Italian Sinner strolled into round two when French opponent Hugo Gaston retired on Rod Laver Arena with the second seed in full control at 6-2, 6-1.

Gaston slumped to his chair and shook his head as his Australian Open ended in distress.

Two-time reigning champion Sinner said it was not how he wanted to win, but was pleased with his night's work.

"I knew from the beginning that I had to play a very high level and was try...