
The new and improved Maria Sakkari sounded a warning after ushering a raft of big guns into the Australian Open second round at Melbourne Park.
World No.1 Ash Barty, Japanese titleholder Naomi Osaka, fourth-seeded French Open champion Barbora Krejcikova, fifth seed Sakkari and Tokyo Olympics gold medallist Belinda Bencic all swept to straight-sets wins on Monday.