That's not right, it can't be.
Right now, USA has allowed 8 runs in common games, Canada 6, and Mexico 2. The only way for Canada and Mexico to advance would be for the final score of this game to be Mexico 1, Canada 0. Otherwise, the winner of this game and the USA both advance (assuming Mexico and USA both beat South Africa). Excepting where Canada allows 2 runs, then it goes into the other tiebreakers.