 Complete the following phrase:  He began his international career in 1998 and took silver medals behind compatriot Jorge Naranjo at the South American Youth and South American Junior Championships. He succeed Nava as the regions top young vaulter with championship records of and to win the youth and junior titles in 2000. He defended the junior title in 2001 before falling behind Brazils Fábio Gomes da Silva in 2002. He also won a silver behind Naranjo during this period at the 2001 Pan American Junior Athletics Championships. He represented Chile at the 