Melbourne, Jan. 16 -- Roger Federer ground out a tough three-set win to make the Australian Open third round for an incredible 20th straight year Thursday and stay on track for a seventh title, with defending champion Caroline Wozniacki also safely through.

But it was curtains for South African fifth seed Kevin Anderson, who slumped out to young American Frances Tiafoe.

On an overcast day at Melbourne Park, former US Open champion and fifth seeded Sloane Stephens joined the big guns in progressing, but the women's side also saw a top 10 player crash.

Ninth seed Kiki Bertens, who raced through the rankings last year after winning three titles, was whipped in three sets by Russia's Anastasia Pavlyuchenkova.

Federer might be 37 but he's ...