Perez entered in the 70th minute for David Texeira and scored his third goal of the season when the ball fell to his feet 3 yards from the goal line following a long ball in.
Columbus scoring leader Dominic Oduro had a goal and an assist to lead the Crew to a 4-2 victory over FC Dallas on Sunday night.
Landon Donovan got his fourth career MLS hat trick, but Blas Perez scored his second goal in the 86th minute to lift FC Dallas into a 3-3 tie with the Galaxy on Sunday night.
FC Dallas (8-6-8, 32 points) suffered a 3-0 defeat to Seattle Sounders FC Saturday night in front of 39,360 fans at CenturyLink Field.
One of the stars the Panamanian national team, Blas Perez scored late in stoppage time to lift FC Dallas to a 2-2 draw against the Union on Saturday.
Eddie Johnson scored twice, including the winner early in the 62nd minute, and the Sounders ended FC Dallas’ nine-game unbeaten streak with a 4-2 victory on Saturday night.
Both teams are coming off of losses but still harbor hopes of postseason glory as the look of the Western Conference table could shift at the end of the midweek clash.
The MLS Disciplinary Committee has suspended FC Dallas forward Blas Perez one game and fined him an undisclosed amount for elbowing an opponent.
FC Dallas has agreed to terms on contracts with Panamanian striker Blas Perez and Colombian defender Hernan Pertuz.