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Lautaro Martínez made his debut in the FIFA U-20 World Cup in 2017, at the age of 20. He was a key player for the Argentina U20 team, scoring three goals and providing three assists in seven matches. Martínez helped Argentina reach the final, where they were defeated by England. Despite the loss, Martínez's impressive performances at the tournament earned him widespread recognition and helped launch his professional career.