Grand slam debutant Nina Bratchikova scored her second upset of the Australian Open on Wednesday, beating Italian Alberta Brianti in straight sets to march into the third round.

The 26-year-old Russian, ranked 136 in the world, swept aside the world No. 71 with the score 6-2, 6-1 to set up a meeting with the unseeded Czech Iveta Benesova.

The 11-year tour veteran Bratchikova, who qualified for her first-ever grand slam, ousted 19th seed Flavia Pennetta, also of Italy, in the first round 6-3, 1-6, 6-2.

Another second-round upset came when Romina Oprandi of Switzerland upset Italy's 10th seed, Francesca Schiavone, 6-4, 6-3.

In other play, top seed Caroline Wozniacki beat Georgia's Anna Tatishvili 6-1 7-6 (4), to face Romania's Monica Niculescu in round three, where they are joined by Belgian Kim Clijsters, the 11th seed who thrashed Stephanie Foretz Gacon of France 6-0, 6-1.

China's fifth seed Li Na brushed aside the unseeded Olivia Rogowska of Australia 6-2, 6-2.

In men's play, Spaniard Rafael Nadal, seeded second, beat Tommy Haas of Germany 6-4, 6-3, 6-4, and seventh seed Tomas Berdych overcame Belgium's Olivier Rochus 6-1, 6-0, 7-6 (4).