For more than a decade, a great season from one of them was almost always followed by a reply from the other. That constant back and forth changed what fans and clubs expect from the very best players.
Consistency became the measure
Before this era, a few outstanding seasons could define a legendary career. Messi and Ronaldo made sustained excellence, year after year, the new standard for greatness.
A blueprint for young players
Young players now study both careers closely. Some learn from Messi's creativity and decision making, others from Ronaldo's discipline, fitness and mentality. Many try to borrow from both.
Whatever side you are on, the rivalry left football better than it found it, and gave a whole generation memories it will keep talking about.
Photo: Wikimedia Commons, used under a free licence.
