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.

The teams actually tied with a 1.0294 percentage score, but Leones Negros' inferior goal difference in the 2014 Apertura and the 2015 Clausura see them go down.

“This is the worst thing you can live through as a manager, a player, a director,” Leones Negros manager Alfonso Sosa told reporters after the match. “We feel sadness, frustration, anger.”

The winner of a two-legged playoff between Ascenso Apertura champion Necaxa and Clausura champion Dorados, crowned Saturday after beating San Luis in the final on aggregate, will take UDG's spot.

Saturday's results see Cruz Azul elminated from Liguilla contention while Santos is in the final spot and must hope Toluca is unable to find a victory against Tigres on Sunday. In other results, Tijuana entered the weekend knowing it needed a victory against Leon but instead was pasted, 6-2. Monterrey and Pumas' draw put both out of the playoffs.

Club America jumped to the top of the heap with a 2-1 win against Atlas, but Tigres or Chivas could surpass them at the top with victories Sunday.