'He isn’t finished,' Roger Federer’s ex-coach believes Jannik Sinner will be No.1 ‘soon’, but players should still take Novak Djokovic seriously - Yardbarker

'He isn’t finished,' Roger Federer’s ex-coach believes Jannik Sinner will be No.1 ‘soon’, but players should still take Novak Djokovic seriously  Yardbarker