Here are the list of ATP World Tour Year-end number one holders since the introduction of the computer rankings in 1973.
2011 Novak Djokovic (Serbia)
2010 Rafael Nadal (Spain)
2009 Roger Federer (Switzerland)
2008 Rafael Nadal (Spain)
2007 Roger Federer (Switzerland)
2006 Roger Federer (Switzerland)
2005 Roger Federer (Switzerland)
2004 Roger Federer (Switzerland)
2003 Andy Roddick (U.S.)
2002 Lleyton Hewitt (Australia)
2001 Lleyton Hewitt (Australia)
2000 Gustavo Kuerten (Brazil)
1999 Andre Agassi (U.S.)
1998 Pete Sampras (U.S.)
1997 Pete Sampras (U.S.)
1996 Pete Sampras (U.S.)
1995 Pete Sampras (U.S.)
1994 Pete Sampras (U.S.)
1993 Pete Sampras (U.S.)
1992 Jim Courier (U.S.)
1991 Stefan Edberg (Sweden)
1990 Stefan Edberg (Sweden)
1989 Ivan Lendl (Czech Republic)
1988 Mats Wilander (Sweden)
1987 Ivan Lendl (Czech Republic)
1986 Ivan Lendl (Czech Republic)
1985 Ivan Lendl (Czech Republic)
1984 John McEnroe (U.S.)
1983 John McEnroe (U.S.)
1982 John McEnroe (U.S.)
1981 John McEnroe (U.S.)
1980 Bjorn Borg (Sweden)
1979 Bjorn Borg (Sweden)
1978 Jimmy Connors (U.S.)
1977 Jimmy Connors (U.S.)
1976 Jimmy Connors (U.S.)
1975 Jimmy Connors (U.S.)
1974 Jimmy Connors (U.S.)
1973 Ilie Nastase (Romania)
