Carlos Alcaraz youngest year-end No. 1 in ATP rankings - The San Diego Union-Tribune
Alcaraz, Ruud to play for world No. 1 ranking in 2022 US Open men's singles final - Official Site of the 2023 US Open Tennis Championships - A USTA Event
Rankings of Indian men's singles tennis players going into 2019
UTR Rating Top 10: Djokovic and Kyrgios Lead Men's Year-end Rankings - Universal Tennis Blog
Rankings | Pepperstone ATP Rankings | ATP Tour | Tennis
Understanding the Men's Singles Tennis Ranking System - HowTheyPlay
Rankings | Pepperstone ATP Rankings | ATP Tour | Tennis
Men's ATP Tennis Rankings | Up-to-Date Singles & Doubles Rankings
ATP rankings - Wikipedia
Lassalle Ranked No. 30 in ITA Singles Tennis Rankings - Eckerd College Athletics