London: Flavia Pennetta became the first seed to fall at Wimbledon after a straight-sets defeat to fellow Italian Camila Giorgi in the first round Monday.

Pennetta, the 16th seed, succumbed to a 4-6, 3-6 defeat to the 20-year-old Giorgi, who is ranked 145th in the world.

In the second round, Giorgi will play Anna Tatishvili of Georgia, who knocked out Thailand's Tamarine Tanasugarn 6-4, 6-2.

Elsewhere, Australia's Samantha Stosur reached the second round after thrashing world No.40 Carla Suarez Navarro.

Stosur, the reigning US Open champion and world No.5, beat Suarez Navarro 6-1, 6-3 and will now face either Dutch player Arantxa Rus or Japan's Misaki Doi in the second round.

Last year's French Open champion Li Na booked her place in the next round by trouncing Ksenia Pervak of Kazakhstan 6-3, 6-1, and will now play either Romania's Sorana Cirstea or France's Pauline Parmentier.

For Li, the 11th seed, the result followed a shock defeat to another outsider from Kazakhstan, Yaroslava Shvedova, in the fourth round of the French Open earlier this month. (IANS)