No. 2 Andy Murray defeated Italy's Andreas Seppi 6-2, 6-4 on Tuesday to advance to the men's quarterfinal of the 2013 Sony Open. He awaits the winner of No. 6 Jo-Wilfried Tsonga and No. 9 Marin Cilic in the tournament in Key Biscayne, Fla.
Also in men's fourth-round action, No. 3 David Ferrer pushed past Japan's Kei Nishikori 6-4, 6-2 on Tuesday. In quarterfinals action, he'll face Jürgen Melzer, who beat Spain's Albert Ramos on Tuesday in sets of 2-6, 6-3, 6-3. And USA No. 17 seed Sam Querrey fell 6-1, 6-1 to Tomas Berdych. Berdych, the No. 4 seed, will face Richard Gasquet, who defeated Nicolas Almagro in the quarters.
In women's action, top-ranked Serena Williams overcame China's Li Na in sets of 6-3, 7-6 (5). Williams did so despite recording six double-faults on the day.
She awaits a semifinals matchup with either No. 4 Agnieszka Radwanska or No. 30 Kirsten Flipkens.