Dementieva, Williams advance at Wimbledon

Williams, the seventh seed, joined her sister in the fourth round as she easily advanced past Spain's Maria Jose Martinez Sanchez, 6-1, 7-5 in just one hour, 12 minutes.

Dementieva, the fifth seed, had trouble in her first set against Argentina's Gisela Dulko, but eventually took the set and won the next in a 7-6 (7-2), 7-5 match that took two hours, six minutes to finish.

Other third-round winners on Saturday included Thailand's Tamarine Tanasugarn and Russia's Alisa Kleybanova. Tanasugarn bounced back from a loss in the first set and rallied for a 4-6, 6-4, 6-4 win over New Zealand's Marina Erakovic while Kleybanova had an easy time with Japan's Ai Sugiyama, 6-4, 6-4.