A goalkeeper, Mascaró is one of the few players who have played for the three greatest clubs in Chilean football: Universidad Católica (1942–46), Colo-Colo (1950) and Universidad de Chile (1951),[1] becoming the first goalkeeper to do it before Adolfo Nef, Oscar Wirth and Paulo Garcés.

[2] A product of Universidad Católica youth system,[3] he also played for Green Cross (1944),[4] Santiago Wanderers (1947)[5] and Everton (1948–49).

[6] In January and February 1944, he took part in two matches against the Punta Arenas team representing Universidad Católica, the second and the third matches in the history of that city versus any professional team, since it doesn't have professional football.

[17] In Guatemala, he coached Comunicaciones, Xelajú MC, getting the league title in 1980,[18] Municipal[19] and Suchitepéquez.

[20] He is one of the five Chilean coaches who have led Municipal along with Luis Grill Prieto, Jaime Hormazábal, Rolando Torino and Fernando Díaz.