The longest intervals between reaching No. 1 for the first time and regaining it for the last time in ATP World Tour ranking history, which began on Aug. 23, 1973 (x-active):

8 years, 10 months, 2 weeks - Jimmy Connors, July 29, 1974/June 13, 1983, reached No. 1 nine times.

8 years, 5 months, 1 week - x-Roger Federer, Feb. 2, 2004/July 9, 2012, reached No. 1 three times.

8 years, 2 months, 1 week - Andre Agassi, April 10, 1995/June 16, 2003, reached No. 1 six times.

7 years, 5 months - Pete Sampras, April 12, 1993/Sept. 11, 2000, reached No. 1 11 times.

5 years, 11 months - Ivan Lendl, Feb. 28, 1983/Jan. 30, 1989, reached No. 1 eight times.

5 years, 5 months, 3 weeks - John McEnroe, March 3, 1980/Aug. 26, 1985, reached No. 1 14 times.

3 years, 11 months - Bjorn Borg, Aug. 23, 1977/July 20, 1981, reached No. 1 six times.