Daher was born in São Paulo on 20 April 1966 and grew up in Barretos, a city in the north of the state.

During the 1980s he was a member of Brazil's Davis Cup squad on multiple occasions, however he didn't ever appear in a fixture.

[1] When Andre Agassi won his first career title at Itaparica in 1987, Daher was the only one of his opponents to win a set against him.

He featured in the main draw at 12 Grand Prix/ATP Tour tournaments in total, most of them in his native country, from which he made the second round four times, with his victories coming against Alberto Tous, Vicente Solves, William Kyriakos and Gabriel Markus.

On the morning of 13 January 2014 he was travelling near Paraty when his car swerved into a lane of incoming traffic and crashed into a tour bus.