After the war, he began an international career, appearing in Paris, Vienna, Prague, London, Mexico City, Rio de Janeiro, Chicago, San Francisco, etc.
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In 1946 and 1947, Mascherini appeared at the New York City Opera, in La bohème (as Marcello), La traviata (with Dorothy Kirsten), Pagliacci (as Silvio, later as Tonio), Rigoletto, Andrea Chénier (opposite Vivian della Chiesa), and Il barbiere di Siviglia (with Luigi Infantino and Virginia MacWatters).
Autodromo Enzo e Dino Ferrari | Enzo Cucchi | Enzo Jannacci | Enzo G. Castellari | Enzo Ferrari | Enzo Mascherini | Enzo Tortora | Enzo Maresca | Enzo Fiermonte | Enzo Martinelli | Enzo Mari | Enzo Maiorca | Enzo L'Acqua | Enzo Ghinazzi | Enzo Ferrari (car) | Enzo Fernández | Enzo Calzaghe | Enzo Bordabehere | Enzo Bettiza | Enzo Barboni's | Enzo Barboni |
His discography includes recordings of La forza del destino (1952), La Gioconda (1952), Madama Butterfly (with Renata Tebaldi, 1952), Simon Boccanegra (with Victoria de los Ángeles, Tito Gobbi and Boris Christoff, 1957), Tosca (with Tebaldi and Enzo Mascherini, 1952) and La traviata (1952).
The tenor sang regularly in Naples and Bologna, and made guest appearances at the New York City Opera in 1947: La traviata (with Enzo Mascherini as Giorgio), Rigoletto (opposite Giuseppe Valdengo and Virginia MacWatters), Madama Butterfly, La bohème, Il barbiere di Siviglia (conducted by Julius Rudel) and Don Giovanni.
MacWatters sang at the New York City Opera from 1946 to 1951, in The Pirates of Penzance (as Mabel, conducted by Julius Rudel), Rigoletto (as Gilda, with Giuseppe Valdengo and Luigi Infantino), Il barbiere di Siviglia (as Rosina, opposite Enzo Mascherini), The Old Maid and the Thief (as Laetitia, with Marie Powers), Le nozze di Figaro (as Susanna), Les contes d'Hoffmann (as Olympia), and Ariadne auf Naxos (as Zerbinetta).