|Full name||Domingos António da Silva|
|Date of birth||28 April 1937|
|Place of birth||Vila Salazar, Angola|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Mascarenhas was born in Vila Salazar, Portuguese Angola. After one season with S.L. Benfica and three with F.C. Barreirense, he joined Sporting Clube de Portugal in 1962; during his three-year spell with the Lisbon club, he scored 80 goals in 107 games all appearances comprised, even friendlies.
In the 1963 Portuguese Cup final, Mascarenhas scored once in a 4–0 win against Vitória de Guimarães. In the following campaign, in Sporting's victorious campaign in the UEFA Cup Winners' Cup, he netted six times in a 16–1 home success against APOEL FC (European competition record), adding another in the final against MTK Budapest FC, the 3–3 leading to a replay in Antwerp which ended with a 1–0 win for the Lions.