Texan Juan Francisco Torres
started and played the first half for Pachuca as it fell at home, 1-0, to San Luis in the first leg of their wild-card playoff game. San Luis' U.S. U-23 defender Michael Orozco
missed the game with a muscle injury.
Argentine Eduardo German Coudet provided the goal with a stoppage-time penalty kick.
The second leg takes place Saturday (8 pm ET; live on Telefutura).
In case of a tie on aggregate, San Luis would advance because of its better regular-season record.