ATP rankings - Wikipedia
Swiatek Once Again Becomes Longest-Serving World No. 1 Among Active WTA Players | Yardbarker
Best tennis players in the world: From Roger Federer to Serena Williams
Katie Boulter set to become British No.1 for the first time | LTA
A brief history of time…spent as world number one, as Medvedev closes in on returning to the top
Give Steffi Graf the honor she deserves" - Billie Jean King counters claims of Novak Djokovic being longest-serving World No. 1 in history
Isner Wins Marathon Match at Wimbledon - The New York Times
Carlos Alcaraz becomes the youngest No. 1 men's tennis player with his U.S. Open win | WAMU
List of ATP number 1 ranked singles tennis players - Wikipedia
Roger Federer: The Longest World No. 1 | ATP Tour | Tennis
Friday Five: The longest serving ATP No.1s | Tennismash
The Master by Christopher Clarey | Hachette Book Group
Wozniacki overtakes Halep to return to WTA World No.1
Which Tennis Player Has Maintained Their World No. 1 Ranking For The Longest Time?
10+ Best Tennis Players of All Time | Men & Women + Stats
5 players with the longest reign as World No. 1 ft. Novak Djokovic and Roger Federer
Tennis: Top five women's singles players with longest first-time weeks-streak as World No. 1
First Among Equals: World No. 1 Record Breakers & Shakers | ATP Tour | Tennis
All you always need to know about Iga Swiatek
Isner–Mahut match at the 2010 Wimbledon Championships - Wikipedia
Novak Djokovic clinches return to No. 1 ranking with first-round win at US Open
Swiatek No Longer Longest-Reigning World No. 1 Among Active Wta Players - IMDb
Top 5 oldest World No. 1 ATP players
