You don't have to be either an introvert or an extravert. The extraversion scale works on a continuum. You can be somewhere in the middle - like federer. As someone said previously, almost everyone would agree that djokovic is an extravert and Ferrer is an introvert. Therefore what would Federer be if no one can agree on what he is?
Wilson ProStaff 6.0 85 - bab. vs nat gut 17 M55 C53