The Leones Negros are going down despite beating Cruz Azul on Saturday because of Puebla's superior goal difference.
The Leones Negros of Universidad de Guadalajara will return to the second division a year after winning promotion to Liga MX.
Despite their 2-0 win Saturday against Cruz Azul, Puebla's 2-2 draw with Santos keeps it in the top division and sends Leones Negros back to the Ascenso. Mexico's relegation system takes the number of points won over the previous six tournaments and divides it by the number of matches played to arrive at a percentage score. The team with the lowest percentage is sent down.