Roger Federer Secures No. 1 Ranking at Age 36 - The New York Times
File:Singles-Ranking-Composite-History-Chart-RogerFederer+RafaelNadal+NovakDjokovic.png - Wikipedia
Roger Federer, 36, becomes oldest world number one in ATP rankings history | South China Morning Post
File:ATP rankings history Djokovic, Federer, Nadal.png - Wikimedia Commons
The tennis 'Big Three' of Djokovic, Federer and Nadal are projected to be out of the top two ATP ranking spots - CBSSports.com
Djokovic begins 311th career week at No. 1, breaking Federer's record
The day Roger Federer earned his first ranking points
Roger Federer | Rankings History | ATP Tour | Tennis
ON THIS DAY: Roger Federer appears on the ATP rankings for the first time, 23 years ago » FirstSportz
File:Roger-Federer-ATP-Ranking-Singles.jpg - Wikimedia Commons
Big Three (tennis) - Wikipedia
Data check: Why the world No 1 rank has switched 6 times between Federer and Nadal in 5 months
Nadal, Djokovic and Federer top year-end ATP Rankings for record eighth time
Roger Federer records that may never be broken: 237 consecutive weeks at No. 1
Rafael Nadal, Roger Federer, and the pursuit of more ranking history
Federer Ranking History
Ranking History of Top 10 Men's Tennis Players (1990-2019) - YouTube
History
ATP TOP10 Players History since 1973 - Ranking by the total number of weeks - Upd. October 8, 2018 - YouTube
File:Singles-Ranking-Composite-History-Chart-RogerFederer+RafaelNadal+NovakDjokovic.png - Wikipedia
Federer Ranking History
