Castro began his singing career in 1992 with the release of Agua Nueva. The album received mixed reviews because Castro's voice was said to be too low-pitched. The album was a big success nonetheless, with the smash hit "No podrás" topping the charts for weeks. After participating in various telenovelas and recording some albums as a teenager, Castro began his "internationalization" in 1993, starting with concerts in Puerto Rico. Castro dedicated a song to that country in his second album