Maria Sharapova who suffered Venus Williams setback at Wimbledon ascribes the loss to shoulder injury. Sharapova`s serve left much to be desired in her fourth round clash against Venus Williams. Her quickest serve was 185 km per hour whereas the American`s first serve averaged 185 km per hour. "My poor serve is the result of the shoulder injury," said Sharapova to Sport Express. "Yet I don`t think I served poorly right from the very beginning." "Venus built up pressure right off the bat." "I served very well in the second set though."