Monterrey failed to take advantage of Guadalajara's slip-up as both of the Torneo Bicentenario's top two dropped points.
Leaders Guadalajara drew 1-1 with Cruz Azul, with each side having a player dismissed. Emanuel Villa gave Cruz the lead after five minutes before team-mate Israel Lopez was sent off.
Nevertheless Guadalajara struggled to break through, losing Mario de Luna Saucedo before an Edcarlos Conceicao own-goal levelled matters.
Monterrey were unable to close the four-point gap though, after themselves drawing 1-1 with Morelia. Neri Cardozo put them ahead after 23 minutes before Jared Borgetti equalised from the penalty spot on the stroke of half-time.
San Luis cruised to a 3-0 win over Queretaro, with Blas Perez and Alfredo Moreno scoring either side of a Joaquin Beltran own-goal.
Pachuca triumphed 2-1 against 10-man Tigres Monterrey, thanks to a pair of Edgar Benitez penalties.
Jaguares had Diego Ordaz and Oscar Razo red carded but were seconds away from sealing a 1-0 win over Atlas before Cesar Ibanez Jimenez levelled at the death.