Brazil scored a 1-0 victory over Algeria today to remain undefeated in the World Cup, but the three-time Cup winner had no easy time doing it.

In Monterrey, Morocco played to a 0-0 tie with highly rated England in a Group F match and, in Irapuato, Hungary scored a goal after only two minutes and went on to defeat Canada, 2-0, in a Group C match.

London bookmakers have installed the Brazilians as 3-to-1 picks to win the World Cup, but they have been less than dominating in their two victories. Brazil defeated Spain, 1-0, in its Group D opener.

Most of the match was played in Algeria's end, but the Brazilians had a difficult time getting shots on goal. When they did split the defense, they were faced with the problem of beating a spectacular goalie, Naceredine Drid. The Algerian defense's one mistake came in the 66th minute and Careca took advantage of it.

The Brazilians' Muller, who had replaced Casagrande two minutes earlier, crossed the ball from the right and Mahmoud Guendouz, standing alone, missed it at the goalmouth as he attempted to clear. The ball reached the unmarked Abdellah Medjadi, who was facing the goal, but he made no attempt to clear as he tried to protect the ball so Drid could grab it. As the two defenders hesitated, Careca slipped between them to score.

England, which was beaten by Portugal, 1-0, in its first match, almost certainly must beat Poland Wednesday to have any chance of advancing.