Data check: Why the world No 1 rank has switched 6 times between Federer and Nadal in 5 months
Roger Federer, Rafael Nadal and Novak Djokovic write ranking history
Roger Federer | Rankings History | ATP Tour | Tennis
Atp live rankings - 1990 to 2022 -
Ranking History of the top 10 Men's ATP Tennis - Every week from 1990 to 2020 -
Record-breaking Federer returns to No. 1 - SWI swissinfo.ch
File:ATP rankings history Djokovic, Federer, Nadal.png - Wikimedia Commons
File:Singles-Ranking-Composite-History-Chart-RogerFederer+RafaelNadal+NovakDjokovic.png - Wikipedia
Roger Federer records that may never be broken: 237 consecutive weeks at No. 1
ATP List: Rafael Nadal in danger of losing No. 2 ranking to Roger Federer – Rafael Nadal Fans
Roger Federer Secures No. 1 Ranking at Age 36 - The New York Times
Djokovic begins 311th career week at No. 1, breaking Federer's record
ATP Tour - Roger Federer is the Mover of the Week in the Emirates ATP Rankings after returning to the Top 10 following his Australian Open triumph. More: http://bit.ly/2kFECzR What ranking will
Roger Federer Pursues the No. 1 Ranking Again. Why Not? - The New York Times