Maria Sharapova reached last four of WTA Finals in Birmingham . Russian star sees off Sesil Karatantcheva of Bulgaria in straight sets . ( CNN ) -- She next beat Alison Waters of the USA who shocked third seed Anne Wickmayer .
Maria Sharapova reached last four of WTA Finals in Birmingham . Russian star sees off Sesil Karatantcheva of Bulgaria in straight sets . She next beat Alison Waters of the USA who shocked third seed Anne Wickmayer .