Weiss was born in Lomas de Zamora, Buenos Aires, Argentina on 31 August 1917.

[1] He reached the eighth finals (fourth round) in the men's single tournament of Roland Garros in 1948.

He also distinguished himself in several international competitions, notably in the United Kingdom and in Germany as in Baden-Baden in 1950, where he dominated Gottfried von Cramm and faced Jaroslav Drobný (a finalist in Roland-Garros three months earlier) in the final.

[3][4] Weiss reached the fourth round in Wimbledon mixed tournament three times: in 1948, 1949, and 1950 (in 1949 with his wife).

Weiss died in 1952,[5] he had fallen ill after returning from a tennis tour in Europe a fortnight before.