Gauff becomes ITF Juniors world No. 1
Wozniacki overtakes Halep to return to WTA World No.1
What the ATP's year-end Top 30 would look like if there had been points at Wimbledon
Throwback: When Roger Federer won the 2018 Rotterdam Open to become the oldest World No. 1
2018 ATP World Tour - Wikipedia
Novak Djokovic to lose men's world No. 1 rank to Daniil Medvedev | Sporting News
Novak Djokovic Clinches Record Seventh Year-End No. 1 In FedEx ATP Rankings | ATP Tour | Tennis
Rafael Nadal and Roger Federer seeded 1-2 for Australian Open
ATP Rankings Movers: Roger Federer Returns To No. 1 | ATP Tour | Tennis
2018 Novak Djokovic tennis season - Wikipedia
Roger Federer Secures No. 1 Ranking at Age 36 - The New York Times
Francesca Di Lorenzo vs. Christina McHale Full Match | 2018 US Open Round 1 - YouTube
U.S. Open 2018: No. 1-seed Simona Halep upset in 1st round by No. 44 Kaia Kanepi – The Denver Post
Swiatek, Gauff lose at Australian Open; Korda in 1st Slam QF
Roger Federer, Floundering in Heat and Humidity, Shows He's Only Human - The New York Times
World No. 1 Ash Barty named 2021 WTA Player of the Year - Just Women's Sports
Australian Open 2018: Djokovic, Federer win; Muguruza out - Sports Illustrated
2018 Australian Open: No. 1 Halep wins classic, will face Wozniacki in final - CBSSports.com
Norrie: Goal is World No. 1
