Sharapova is unhappy with the official balls of WTA Championships
Russian tennis player Maria Sharapova, who won Wimbledon this season, said she was unhappy with the official WTA-tour balls: according to the tennis player, they are too heavy and can cause serious chest or shoulder injury. In connection with the discomfort caused, Maria asked not to use Tretorn balls at the final WTA Championships tournament, which starts on Wednesday, reports Soviet Sport with reference to Reuters .