 Roger Federer ( German : [ <unk> ] born 8 August 1981 ) is a Swiss professional tennis player who is currently ranked world No. 3 by the Association of Tennis <unk> ( ATP ) . His accomplishments in professional tennis have led to him being regarded by many as the greatest tennis player of all time . Federer turned professional in 1998 and has been continuously ranked in the top 10 since October 2002 . 
