Casillas is considered one of the true pioneers of women’s kickboxing. She was not only its first world champion, but she became its biggest advocate. Starting her professional fighting career in 1976, she spent her time in both the boxing and kickboxing arena. In 1979, she became the first Working Kickboxing Association’s bantamweight champion, and also in 1979, she became the World Women’s Boxing Champion, the first athlete to win both titles. Through a career of 38 fights, she amassed 36 wins by knockout, and she was undefeated in both boxing and kickboxing. Upon her retirement, she became an instructor in kali under world acclaimed Angel Cabales, and in 2005 she was inducted into the Martial Arts History Museum’s Hall of Fame.