2018 Australian Open: No. 1 Halep wins classic, will face Wozniacki in final - CBSSports.com
Throwback: When Roger Federer won the 2018 Rotterdam Open to become the oldest World No. 1
U.S. Open 2018: No. 1-seed Simona Halep upset in 1st round by No. 44 Kaia Kanepi – The Denver Post
No. 1-ranked Simona Halep advances to Western & Southern Open quarterfinals
Mountain View girls tennis looks solid early on - The Columbian
List of WTA number 1 ranked singles tennis players - Wikipedia
At 36, Roger Federer Becomes Oldest No. 1 In Tennis
Roger Federer reclaims No. 1 ranking by reaching Stuttgart final
Novak Djokovic or Rafael Nadal for No 1, what shape is Simona Halep in? The 2018 questions that still need answering
Impressive Stretch Of Tennis For British No. 1 Kyle Edmund
Tennis: 4 contenders for the year-end No. 1 World Ranking
List of ATP number 1 ranked singles tennis players - Wikipedia
2018 champion Kerber vs. No. 1 Barty in Wimbledon semifinals – Oneida Dispatch
U.S. Open 2018: No. 1-seed Simona Halep upset in 1st round by No. 44 Kaia Kanepi – The Denver Post
ZooTennis: A Look at First ITF Junior Rankings of 2018; Quarterfinals Set at Los Angeles Futures; De Minaur Beats Mmoh to Reach ATP Brisbane Semifinals
ATP Rankings Movers: Roger Federer Returns To No. 1 | ATP Tour | Tennis
Roger Federer Pursues the No. 1 Ranking Again. Why Not? - The New York Times
ATP Rankings Movers: Rafael Nadal Returns To No. 1 | ATP Tour | Tennis
2018 champion Kerber vs. No. 1 Barty in Wimbledon semifinals
Top 5 WTA Upsets 2018 (No.1): Sasnovich shocks title favorite Kvitova in Wimbledon opener
US Open Tennis 2018 Results: Tuesday's Singles Bracket Winners, Scores, Stats | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
Serena Williams gets No. 17 seed at 2018 U.S. Open - UPI.com
Ashleigh Barty and Katerina Siniakova secure WTA World No.1 rankings
US Open 2018: British No 1 Kyle Edmund knocked out in first round after struggling with cramp | The Independent | The Independent
Karolina Pliskova Gets the Opponent She Craves: Serena Williams - The New York Times
Carlos Alcaraz becomes the youngest No. 1 men's tennis player with his U.S. Open win | News | WLIW-FM
Swiatek wins easily, but knows who's No. 1; Nadal bloodied | AP News
