Sharapova complained that the new balls Tretorn, used on th Tour, are too heavy and hurting her arm. Mauresmo disagreed, saying that he hasn't noticed any difference at all. Tretorn balls are pressureless. Have anyone used them? Some balls, e.g. double core, are indeed heavy. So does Maria got the point here, or be advised to grow up, train harder, build muscles, to be able to use heavier racquet, and be like Mauresmo.