Maryland: 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.
Mirza, battling a left knee injury suffered three weeks ago in a first-round Wimbledon exit, reached the Charleston quarter-finals in April as a qualifier but has won only once since and struggled again in a match that dragged past midnight to finish in the early hours of Tuesday.
"I felt like I was really rusty," Mirza said. "I played OK a few games and then I didn't. It was just a matter of putting together a few games, which I couldn't do.