6. Ronaldo vs Porto
https://www.youtube.com/watch?v=7JLkI7AUFo0 Back in 2009, with Ronaldo just months away from his Manchester United exit, he produced this sensational Champions League strike at the home of Porto, his former rivals during his Sporting Lisbon days. The then 24-year-old picked the ball up about 40 yards from goal, and there didn't appear to be too much apparent danger for the hosts. Ronaldo unleashed an absolute rocket of a shot from nowhere though, and it flew into the top corner of the net. It was a hugely enjoyable goal for the forward, who silenced the home faithful, and also an important moment in United's quest for another Champions League crown. They would go on to lose 2-0 to Barcelona in the final.