Born in Costa Rica, Cantillo earned eleven caps with the U.S. national soccer team between 1979 and 1982.
Cantillo was only 17 years old, but quickly established himself as among the most talented players in the league when he won MVP honors as a rookie.
[2][3] In February 1975 the Comets loaned him to the Tampa Bay Rowdies of the North American Soccer League for the upcoming NASL indoor tournament.
At the end of the 1975 ASL season, the Comets traded Cantillo to New York Inter-Giuliana SC, of the semi-pro German-American Soccer League, which played in the winter months.
He played a single season, twenty-one games total, with the Rowdies before returning to the ASL, this time signing with the New Jersey Americans.
Cantillo was part of the ASL's most exciting team as the Americans played a free-flowing attacking game which took them to the 1977 championship.