China's Zheng Jie set up a potential Wimbledon revenge mission against four-time champion Serena Williams as she eased to a 6-4, 6-2 second round victory over Canada's Aleksandra Wozniak on Thursday.
Spain's Anabel Medina Garrigues defeated qualifier Melanie Oudin 6-4, 4-6, 6-0 on Monday as the main draw action got underway at the WTA Tour's Charleston tournament.
India's seventh-seeded Sania Mirza suffered her sixth loss in seven matches, falling 7-5, 6-4 to Canada's Stephanie Dubois in her opening match at a $220,000 WTA hardcourt tournament.