Round-of-16 action at the U.S. Open has seen few surprises on the court. American Serena Williams dominated her opponent Andrea Hlavackova in straight sets, 6-0, 6-0. The only other women's match completed so far on Monday was also won in straight sets by Ana Ivanovic over Tsvetana Pironkova, 6-0, 6-4.
No. 6 Angelique Kerber leads No. 10 Sara Errani 5-4 in the first set of their match. No. 2 Agnieszka Radwanska will face No. 20 Roberta Vinci later on Monday.
On the men's side, No. 6 Tomas Berdych won his match against No. 11 Nicolas Almagro, 7-6 (7-4), 6-4, 6-1. Berdych will advance to play Roger Federer in the quarterfinals after American Mardy Fish withdrew from their match, citing health reasons. No. 12 Marin Cilic will face Martin Klizan later on Monday while No. 3 Andy Murray will face No. 15 Milos Raonic.