A Tae Kwon Do instructor, Roberto started bodybuilding to supplement his martial arts with weight training. In November 2006 Roberto entered his first junior competition, and took the home the prize in four categories: Beginners, Juniors, Seniors and Overall. One week later he was crowned WABBA Junior Mr Spain, giving him path to the Copa de España 2006, where he took the Overall.
At the WABBA Mr. Europe 2006, Roberto placed third in his weight class, taking the Overall prize for the 2006 NABBA Mr World Junior.