[3] Regarded as one of the greatest defensive boxers of all time,[4] his way of frustrating his foes with a minimum of head movement and avoiding most of their punches earned him the moniker 'El Intocable' (the Untouchable).

Locche was known as "El Intocable" ("The Untouchable") due to his defensive mastery, and became the Lineal and WBA Light Welterweight Champion in Tokyo, Japan on December 12, 1968, after defeating Paul Takeshi Fuji by technical knockout after Fuji refused to start the 10th round out of frustration because of exhaustion and his inability to connect punches on "The Untouchable," according to the Argentine boxing commentators' recount of the bout (Dotora, 2004).

[citation needed] Locche became an idol in Argentina and routinely sold out the Luna Park, Buenos Aires every time he fought at the well known boxing arena.

[citation needed] Numerous Argentine sources also cite the fact that Locche's approach towards submitting himself to traditional boxing training and discipline was sometimes lackadaisical.

[citation needed] Locche defended his title six times, against Carlos Hernandez, João Henrique, Adolph Pruitt, Antonio Cervantes and Domingo Barrera Corpas, before losing it to Alfonso Frazer in Panama on March 10, 1972.