Agnieszka Radwanska was upset in the fourth round of the U.S. Open on Monday by Roberta Vinci in straight sets, 6-1, 6-4.
Radwanska entered the tournament as the No. 2 seed on the women's side and rolled through her first three opponents before her defeat at the hands of Vinci on Monday. Vinci now faces No. 10 seed Sara Errani in the quarterfinals. Errani advanced by upsetting Angelique Kerber, 7 (7) -6 (5), 6-3.
In other action, Serena Williams rolled over Andrea Hlavackova in her fourth-round matchup, 6-0, 6-0. She moves on to the quarterfinals where she will face 12th-seeded Ana Ivanovic.
On the men's side, Andy Murray is currently in action against Canadian Milos Raonic. Tomas Berdych was also victorious, defeating Nicolas Almagro in straight sets.
For a complete list of scores and draws, visit the official U.S. Open site.