Lobos came out looking to make their home-field advantage count, and they started the game at a good pace with dangerous chances coming early on. They hit the post and then saw a header by Diego Jiménez go just wide as they pressed for the opening goal.
After weathering the early storm, Dorados looked to get a foothold of their own. Gabriel Hacen came close with his volley that went just centimeters over the bar; then, in the 22nd minute, he had another opportunity but again couldn’t find the target.
Immediately after that, Lobos opened the scoring. In the 23rd minute, Orlando Rincón sent a cross in and Amaury Escoto headed it home to make it 1-0 for the universitarios.
That goal gave Lobos even more confidence and they continued to press forward as they looked for a second. In the 39th minute, Alfonso Sánchez missed a clear opportunity in front of goal, and the score remained 1-0 going into halftime.
Just moments into the second half, the night took a turn for Lobos. Escoto went down in the box in the 47th minute, but the referee declined to call a penalty. Escoto and goalkeeper Gaspar Servio got into a confrontation about the non-call, and Escoto bumped his forehead against Servio; the keeper went down in a heap and Escoto was red-carded, leaving Lobos to see out the rest of the game with just 10 men.
But Dorados were ultimately unable to take advantage of their extra man, with Lobos able to hold on to the narrow lead.
With the 1-0 win, Lobos will earn promotion to the first division with a win or draw in Saturday’s second leg, while Dorados will need to win by two goals. A one-goal Dorados win would send the game to extra time and then penalties if needed; away goals are not tiebreakers in this series.