Onetti has wonderful novels ('Corpse Collector', 'Let the Wind Speak', 'The Shipyard').
'The Truce' is about the best thing Benedetti wrote. The work of his last years is essentially negligible.
I would add (as a starting-point and in no way a complete list) the following authors, some at least of which have been translated into English:
FICTION: Horacio Quiroga, Jules Supervielle, Felisberto Hernández, Anderssen Banchero, Carlos Martínez Moreno, Francisco Espínola, Armonía Somers, Tomás de Mattos, Antonio Larreta.
POETRY: Comte de Lautréamont (Isidore Ducasse), Julio Herrera y Reissig, Líber Falco, Idea Vilariño, Pedro Piccatto, Marosa di Giorgio.
DRAMA: Florencio Sánchez, Ernesto Herrera.

