Education
Collarini had represented Argentina in the early days of his career from 2007 to 2010, until he chose to represent United States of America from 2010 to 2012 before switching back to represent Argentina.
Collarini had represented Argentina in the early days of his career from 2007 to 2010, until he chose to represent United States of America from 2010 to 2012 before switching back to represent Argentina.
In 2010, he reached the final of the French Open boys" singles event.