Club León saw Rubens Sambueza shown red, but held out to advance to the 2019 Liga MX Clausura Final.
Club América came into the match knowing they needed to score twice to have any chance of overturning the tie, and they opened the scoring early when Bruno Valdez appeared unmarked from a corner to head in the goal.
A brilliant save from Rodolfo Cota denied Guido Rodriguez a second, and by the end of the second period, there was no escaping the fact that Club América was the better team.
León improved after the break, and an Angel Mena cross floated dangerously across the Club América box.