As Cristiano Ronaldo Jr. is still very young and developing his skills as a footballer, it is difficult to identify a definitive list of his top 10 goals. However, here are some notable goals that Ronaldo Jr. has scored in his youth career:

1. In December 2018, Ronaldo Jr. scored a hat-trick in a youth match for Juventus against Maritimo. He displayed impressive technique and composure in front of goal.
2. In January 2020, Ronaldo Jr. scored a fantastic solo goal for the Juventus Under-9 team, dribbling past several defenders before calmly slotting the ball past the goalkeeper.
3. In February 2020, Ronaldo Jr. scored a powerful strike from outside the box in a youth match for Juventus against Pontevecchio.
4. In June 2020, Ronaldo Jr. scored a brace for the Juventus Under-10 team against Genoa, showcasing his quick feet and excellent finishing ability.
5. In July 2020, Ronaldo Jr. scored a stunning free-kick for the Juventus Under-10 team, curling the ball over the wall and into the top corner of the net.
6. In September 2020, Ronaldo Jr. scored a well-placed header in a youth match for Juventus against Tavagnacco.
7. In October 2020, Ronaldo Jr. scored a hat-trick in a youth match for Juventus against Carpenedolo, with all three goals coming from close range.
8. In November 2020, Ronaldo Jr. scored a superb solo goal for the Juventus Under-10 team, dribbling past several defenders before firing the ball into the bottom corner of the net.
9. In December 2020, Ronaldo Jr. scored a spectacular volley in a youth match for Juventus against Canelli, displaying his excellent technique and accuracy.
10. In January 2021, Ronaldo Jr. scored a well-placed finish in a youth match for Juventus against Lione, demonstrating his clinical finishing ability in front of goal.

As Mateo Messi is still very young and developing his skills as a footballer, it is not possible to identify a definitive list of his top 10 goals. However, here are some notable goals that Mateo has scored in his youth career:

1. In September 2020, Mateo scored a well-placed finish in a youth match for Barcelona against Hospitalet, displaying his promising finishing ability.
2. In October 2020, Mateo scored a fantastic solo goal for the Barcelona Under-6 team, dribbling past several defenders before calmly slotting the ball into the net.
3. In November 2020, Mateo scored a well-placed header in a youth match for Barcelona against Sant Gabriel.
4. In December 2020, Mateo scored a stunning free-kick for the Barcelona Under-6 team, curling the ball over the wall and into the top corner of the net.
5. In January 2021, Mateo scored a powerful strike from outside the box in a youth match for Barcelona against Gava.
6. In February 2021, Mateo scored a well-placed finish in a youth match for Barcelona against Vilafranca.
7. In March 2021, Mateo scored a superb solo goal for the Barcelona Under-6 team, dribbling past several defenders before firing the ball into the bottom corner of the net.
8. In April 2021, Mateo scored a well-placed finish in a youth match for Barcelona against Espanyol.
9. In May 2021, Mateo scored a stunning volley in a youth match for Barcelona against Cornella, displaying his impressive technique and accuracy.
10. In June 2021, Mateo scored a well-placed header in a youth match for Barcelona against Girona.