Whoever wins the Ballon d'Or, the Messi-Ronaldo duopoly is coming to an end - Eurosport
The Great Debate: Who is the Better Player, Ronaldo or Messi? - The Observer
Never Saw Messi as a Rival, Says Ronaldo
Cristiano Ronaldo - Wikipedia
Cristiano Ronaldo - Wikipedia
Lionel Messi - Wikipedia
The Messi vs Ronaldo Debate - Barca Blaugranes
Is 'Ronaldo vs Messi' the greatest rivalry in the history of sports? - Quora
Lionel Messi - Wikipedia