Ten-man Tigres stayed top of the Mexican Clausura with a goalless draw against Atlas.
Tigres had to play 65 minutes of the match with 10 men after Argentine striker Damian Alvarez was sent off for using foul and abusive language.
Alvarez was unhappy with a series of fouls which he felt had gone unpunished, before he lost his patience with referee Francisco Chacon.
Tigres are level on points with Santos Laguna, who also drew, in their case 1-1 with Monterrey.
Luis Perez put Monterrey ahead, but Aaron Galindo equalised with nine minutes left.
Goals from Jose Sand and Duvier Riascos helped Tijuana to a 2-0 win at Queretaro
Cruz Azul and Unam Pumas also played out a 1-1 draw.
Eduardo Herrera put the Pumas ahead, but Javier Aquino equalised midway through the second half.
Elsewhere, there was a goalless draw between Guadalajara and San Luis.
