Rotterdam - Roger Federer by the numbers after the 36-year-old became the oldest world No 1 on Friday.
Oldest world number ones:
1: Roger Federer, 36, on February 19, 2018
2: Andre Agassi, 33, on September 7, 2003
3: Rafael Nadal, 31, on February 18, 2018
4: JimmyConnors, 30, on July 3, 1983
5: Ivan Lendl, 30, on August 12, 1990
Total weeks as ATP world number one (as of Feb 19, 2018):
1: Roger Federer 303
2: Pete Sampras 286
3: Ivan Lendl 270
4: Jimmy Connors 268
5: Novak Djokovic 223
6: John McEnroe 170
7: Rafael Nadal 167
8: Bjorn Borg 109
9: Andre Agassi 101
10: Lleyton Hewitt 80
Longest gap between stints as ATP world number one (as of Feb 19, 2018):
1: Roger Federer 5 years, 106 days
2: Andre Agassi 3 years, 142 days (1996-99)
3: Jimmy Connors 3 years, 65 days
4: Rafael Nadal 3 years, 45 days
5: Andre Agassi 2 years, 228 days (2000-03)