The third seeded Vinci will face second seed Jelena Jankovic in the final. Jankovic beat Aussie Casey Dellacqua 7-5, 6-4.
Vinci posted her third career "double-bagel" victory and second against a Serb in one month. She beat former world number one Ana Ivanovic by the same score in Montreal two weeks ago.
Vinci next faces another former world number one from Serbia in Jankovic. “I know it will be tough, but I’ll try my best,” said Vinci.
Berdych, Tsonga in Salem Open semis
Czech second seed Tomas Berdych and US seventh seed Sam Querrey advanced to a semi-final match-up at the Winston-Salem Open. Berdych beat Belgian Steve Darcis 4-6, 6-2, 6-0, while Querrey Alexandr Dolgopolov 7-5, 4-6, 7-6 (7/3).