Roger Federer plays professional tennis.
The ATP Finals is the second highest tier of men 's tennis tournament after the four Grand Slam tournaments . Roger Federer ( born 8 August 1981 ) is a Swiss professional tennis player . Federer turned professional in 1998 and was continuously ranked in the top 10 from October 2002 to November 2016 . He is currently ranked world No. 5 by the Association of Tennis Professionals ( ATP ) .