Federer ended the longest reign as the world's #1 lastweek, relinquishing the title to Nadal.  His streak is by far the longest of all time, however; Connors was only knocked off of his #1 ranking for one week in between his two long streaks shown in the graph above, otherwise he would still be holding the longest all-time streak.

Will new number #1 Rafael Nadal start his streak this week at the US Open?

Federer's streak ran from February 2, 2004 to August 17, 2008.

Connors' longest streak ran from July 29, 1974 to August 22, 1977.

Lendl's longest streak ran from September 9, 1985 to September 11, 1988.

Sampras' longest streak ran from April 14, 1996 to March 29, 1998.

Connors' second longest streak ran from August 30, 1977 to April 8, 1979.

Sampras' second longest streak ran from September 13, 1993 to April 9, 1995.

Lendl's second longest streak ran from January 30, 1989 to August 12, 1990.

Hewitt's streak ran from November 19, 2001 to April 27, 2003.

McEnroe's streak ran from August 3, 1981 to September 12, 1982.