edit: Whoa, why the downvote? I'm justing pointing it out that is impossible to talk about Messi without talking about CR7 (and vice-versa).
The first, Ronaldo Nazario de Lima, started his the career known as Ronaldinho, but droped soon later to just Ronaldo. Idol of Brazil's 2002 winning. Transvestite scandals. Famous for performances with Brazil and Real Madrid. A.K.A. as "phenomenon". http://bit.ly/1pHIQH7.
The second, the well-known Ronaldinho, is most remembered for Barcelona, but also played for Milan. Not well known for it's performance with the national team, unlike the first. It still an idol across the globe even nowadays. Plays for Atletico Mineiro (my team :D :D). http://bit.ly/1mGDCmT.
The third, the portuguese one of the list, is the most recent one. Despite being Cristiano Ronaldo, we sometimes short to just Ronaldo since it's the "relevant" one today. Also known as CR7 (7 is his shirt number). Started the career in a astonishing way in Manchester United, he was a kid that got a place in a very old and experienced team. Nowadays an idol at Real Madrid. http://bit.ly/1i5uUSr.
So, funny thing ...
When I first saw "CR7" I immediately thought it was some sort of abbreviation, like I18N, and assumed it meant "CR" followed by 7 letters.
So that's apparently how my brain works.
So at one point, Ronaldo Rodrigues de Jesus was "Ronaldo", Ronaldo Nazario de Lima was "Ronaldinho", and Ronaldo de Assis Moreira was "Ronaldinho Gaucho".
Cristiano's explosion onto the scene at Manchester United was remarkable but "astonishing" is a bit of a stretch, since they've always given chances to younger players to work their way into the first team and many of them have impressed, including David Beckham (who Cristiano Ronaldo replaced), Paul Scholes, Ryan Giggs, and more recently Adnan Januzaj.
I think you wanted this https://www.youtube.com/watch?v=m8bZhNBQktQ