Miguel Herrera hailed the focus of his Mexico side as they overcame some contentious officiating to beat Cameroon 1-0.
In the end, a solitary strike from Oribe Peralta just past the hour mark settled a contest played in rain-lashed Natal.
The margin of victory could have been much more convincing, though.
Giovani dos Santos saw two first-half efforts ruled out for offside, with replays suggesting that he was unfortunate to see the flag go up on each occasion.
Herrera insists that no thought was given to what could have been when delivering his half-time team talk, with positivity the order of the day as Mexico dusted themselves down to make a winning start to their Group A campaign.
He said: “I told the boys before the match to keep their focus on our game plan, whatever happens.
“Human error exits. We have to learn to put up with whatever comes our way.
“We didn’t think about the referee when we went back to the dressing room (at the interval).
“Concentration is essential and the lads did well to keep their composure.”