I thought it would be interesting to compare top players time range from when they first became number 1 to when they were last number 1. This statistic would be indicative to their longevity at playing at the very top level. What I am giving here is the maximum possible ranges, so to avoid controversy I am choosing as their start and end times when a reasonable number of commentators said that they were number 1 - even if it wasn't universal. Also I need to make it clear that when I say 9 years for Connors say, it doesn't mean he was number 1 for 9 years continuously - just 9 years between when he was first number 1 to last number 1. So the point of this thread isn't to argue about if they were or weren't - it is the maximum possible range of time that someone was first number 1 to last being number 1). I haven't always followed the ATP rankings. But pre-open era I have used http://en.wikipedia.org/wiki/World-number-one_male_tennis-player_rankings This is not perfect I know - but it is indicative. ATP rankings are: http://en.wikipedia.org/wiki/List_of_ATP_number_1_ranked_singles_players Tilden - 11 yrs (1920 to 1931) Rosewall - 11 or 10 yrs (late 1960 to perhaps 1970 or 1971) Pancho Gonzales - 9 yrs (1952 to 1961) Connors - 9 yrs (July 1974 to July 1983) Agassi - 8.5 yrs (Early 1995 to Late 2003) * Federer - 8.5 yrs (Early 2004 to Late 2012) Sampras - 7.5 years (early 1993 to late 2000) Lendl - 7.5 yrs (Early 1983 to late 1990) Laver - 7 years (mid 1964 to mid 1971) Perry - 7 yrs (1934 to 1941) Kramer - 6 or 5 years (1947/1948 to 1953) Borg - 5 or 4 yrs (depending on who you talk to - ended Mid 1981) Budge - 5 or 4 yrs (depending on who you talk to - 1938??? - 1942/1943???) Vines - 5 yrs (1932 to 1937) McEnroe - 4 yrs (Mid 1981 to Mid 1985) * Nadal - 3 yrs (mid 2008 to mid 2011) Note: * players still playing (hence may add to time yet).