The biggest clubs in Europe like to boast about having a wonder kid or two.
There may be very few players who can challenge the likes of Lionel Messi and Cristiano Ronaldo while they're still playing, but one day, they won't be around.
When they retire, the world's best player crown will fall to someone else and a new name will be inscribed on the Ballon d'Or.
Paris Saint-Germain loanee Kylian Mbappe lit up the Champions League with AS Monaco last season, firing them into the semi-finals of the competition.
The 18-year-old was heavily linked with a move to European champions Real Madrid throughout the summer, before moving to Paris.
It's believed that part of his loan deal included a £166 million price tag, that PSG will have to pay Monaco at the end of this season.
But Madrid won't be too upset about missing out because they've got a wonder kid of their own.
A couple of months ago, at the U21 European Championships, Marco Asensio caught plenty of attention.
He's since returned to Real and at the age of just 21, is challenging for a place in the team alongside the likes of Ronaldo, Gareth Bale and Sergio Ramos.
But it's not just these two European sides that can boast about having a promising young player, especially after Saturday night.
Liverpool's Ben Woodburn made his international debut for Wales against Austria at the age of just 17.
And it's fair to say the forward impressed. The game at the Cardiff City Stadium was a must win. It finished 1-0 to the hosts, thanks to Woodburn, who scored a screamer in the second half.
He took the ball out of the air a few yards outside the box, before turning and firing a shot into the bottom corner from distance.
Check out a video below.
With Bale on the pitch, much of the attention would have been on him. But it was Woodburn who stunned Austria, showing he has a bright future ahead of him.
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