Italy's Camila Giorgi caused one of the upsets of the first round at the Australian Open with victory over compatriot Flavia Pennetta.

After losing the first set 6-4, Giorgi recovered in style to win the next two sets 6-2, 6-3 against her 12th-seeded opponent.

Giorgi will meet Tereza Smitkova of the Czech Republic in round two.

There was disappointment for Diego Schwartzman and Mike Russell who bowed out of the Men's Singles.