On February 14, 1999, Los Vatos Locos defeated the Los Vipers team of Histeria, Maniaco, Mosco de la Merced and Psicosis II to win the Mexican National Atómicos Championship. Their first run with the Atómicos title was short lived as they were defeated by Los Juniors (Blue Demon, Jr., La Parka, Jr., Máscara Sagrada, Jr. and Perro Aguayo, Jr.) only 63 days later. Before 1999 was up they won the Atómicos championship once again having defeated Los Vipers for the gold once again.
On February 14, 1999, Los Vatos Locos triumphed over the Los Vipers team consisting of Histeria, Maniaco, Mosco de la Merced, and Psicosis II to emerge victorious in the Mexican National Atómicos Championship. However, their reign was short-lived as they were soon ousted by Los Juniors just 63 days later. Before the year ended, Los Vatos Locos reclaimed the championship, having defeated Los Vipers once more.