Next up for Sharapova on the grass of the Edgbaston Priory club will be American teenager Alison Riske , who shocked Belgian third seed Yanina Wickmayer 6-7 6-4 6-3 on Friday . Alison Riske reaches last four of WTA tournament in Birmingham . Russian star sees off Sesil Karatantcheva of Kazakhstan in straight sets . She next faces Yanina Wickmayer of the USA who shocked first seed Maria Sharapova .
Alison Riske reaches last four of WTA tournament in Birmingham . Russian star sees off Sesil Karatantcheva of Kazakhstan in straight sets . She next faces Yanina Wickmayer of the USA who shocked first seed Maria Sharapova .