Mexico were rewarded for their attacking intent when Oribe Peralta's 61st minute strike gave them a 1-0 win over Cameroon in their World Cup opener at a rain-soaked Dunas arena.
The Mexicans had two Giovani Dos Santos efforts controversially disallowed in the first half but Peralta's goal means they will now feel they have a good chance of progressing from Group A, which also includes hosts Brazil and Croatia.
Cameroon, who only arrived in Brazil after a player strike was averted by last-minute negotiations, had packed their midfield in an attempt to stifle the Mexicans and lone striker Samuel Eto'o failed to find the goal with his few opportunities.
Mexico came out to attack as coach Miguel Herrera had promised and "El Tri" dominated the opening exchanges with wingbacks Miguel Layun and Paul Aguilar getting plenty of space out wide.
Dos Santos first found the net after 11 minutes but was called back despite appearing to be in line with the defenders.
Cameroon could have taken the lead after 21 minutes when fullback Benoit Assou-Ekotto beat two defenders and found Eto'o in the box but the striker was able only hit the outside of the post.
If the decision to deny Dos Santos a first goal could be called a marginal call, the second was a clear error.
A corner swung in from the left was flicked on by one Cameroon defender and, as another raced off the line, Dos Santos managed to turn back and angle the ball into the net with his head.
Peralta almost broke the deadlock three minutes after the break after Dos Santos played him through on goal but Cameroon goalkeeper Charles Itandje blocked his shot with his legs.
Dos Santos was released through the middle of the Cameroon defence and when Itandje managed to stop his low drive, Peralta was on hand to steer the ball into the empty net and send Herrera and the thousands of Mexican fans into paroxyms of joy.