Spain's David Ferrer, the world No. 4, defeated Italy's Andreas Seppi 6-3, 6-2 to advance to the round of 16 at the Sony Open in Key Biscayne, Florida.

The 31-year-old Ferrer, who skipped the Masters 1000 tournament in Indian Wells, California, due to injuries he sustained at the event in Acaculpo, did not get much resistance from the Italian on Sunday.

Next up for the Spaniard is Japan's Kei Nishikori, who upended rising Bulgarian star Grigor Dimitrov, the No. 15 seed, 7-6 (7-1), 7-5.

In other men's action on Sunday, defending champion Andy Murray of Great Britain beat Spain's Feliciano López 6-4, 6-1, while Spain's Tommy Robredo defeated France's Julien Benneteau 6-3, 6-4.

Switzerland's Roger Federer cruised past Thiemo de Bakker, of The Netherlands, 6-3, 6-3.

On the women's side, Spain's Carla Suarez Navarro beat Estonia's Kaia Kanepi 6-2, 6-1, while China's Li Na beat American Madison Keys 7-6 (7-3), 6-3.

Denmark's Caroline Wozniacki rolled over American Sloane Stephens 6-1, 6-0.

The Sony Open is one of the biggest hard-court events on the ATP and WTA calendars. EFE