Borja netted with a first-time strike after Willian's cut-back in the seventh minute of a fiery contest at the Corinthians Arena on Saturday, reports Xinhua news agency.
Both teams were reduced to 10 men when Clayson Vieira and former Brazil international midfielder Felipe Melo were sent off for a heated altercation just before halftime.
Palmeiras need only a draw in the second leg at their Allianz Parque on April 8 to secure the club's first state title since 2008.
On Wednesday, the team will host Peru's Alianza Lima in a Copa Libertadores Group H fixture.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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