Jelena Jankovic claims the Venus Williams Pan Pacific Open title in Tokyo . Unseeded Serbian beats Maria Sharapova who retires with wrist injury in first set . Sharapova has taken advantage of a series of shocks in the $ 2 million tournament which saw world number one Venus Williams wins first round match at China Open in Tokyo .
Jelena Jankovic claims the Venus Williams Pan Pacific Open title in Tokyo . Unseeded Serbian beats Maria Sharapova who retires with wrist injury in first set . Venus Williams wins first round match at China Open in Tokyo .