Zverev: 'I'm not thinking about being world no. 1 or ending 2018 there'
World No. 1 Halep Joined By Past US Open Champions in 2018 Field | Long Island Tennis Magazine
WTA Rankings: Simona Halep finishes as World No 1 for second year running
Tennis: Medvedev first man in 18 years other than 'Big 4' to be world No 1 - The Week
US Open Tennis 2018 Results: Tuesday's Singles Bracket Winners, Scores, Stats | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
No. 1 Barty Beats 2018 Champ Kerber To Reach Wimbledon Final
U.S. Open 2018: No. 1-seed Simona Halep upset in 1st round by No. 44 Kaia Kanepi – The Denver Post
Rafael Nadal: No. 1 headed to 2018 Australian Open
2018 Novak Djokovic tennis season - Wikipedia
Roger Federer Pursues the No. 1 Ranking Again. Why Not? - The New York Times
2018 champion Kerber vs. No. 1 Barty in Wimbledon semifinals | AP News
Throwback: When Roger Federer won the 2018 Rotterdam Open to become the oldest World No. 1
No. 1 Novak Djokovic advances in Australia; Stan Wawrinka out
At 36, Roger Federer Becomes Oldest No. 1 In Tennis
Federer marks No.1 ranking with 98th title in Stuttgart - EgyptToday
Djokovic Presented Year-End ATP World Tour No. 1 Trophy At Nitto ATP Finals - Tennis TourTalk
US Open 2018: British No 1 Kyle Edmund knocked out in first round after struggling with cramp | The Independent | The Independent
2018 champion Angelique Kerber, No. 1 Ash Barty into Wimbledon semifinals | Sports News,The Indian Express
Tennis: 4 contenders for the year-end No. 1 World Ranking
2018 champion Kerber vs. No. 1 Barty in Wimbledon semifinals - ABC News
Roger Federer replaces Rafael Nadal as tennis World No. 1, Novak Djokovic slips | Tennis News - Hindustan Times
Roger Federer reclaims No. 1 ranking by reaching Stuttgart final
