Bolivar laid the foundation for progression before the break. Their 1-0 halftime advantage gave the home side control of the tie and forced Gremio FB Porto Alegrense RS to chase the game after the restart. That pressure eventually changed the score on the night, but not the bigger picture.
The visitors did enough to pull the match back to 2-2, producing the kind of response that kept the contest alive deep into the second half. Even so, Bolivar had already done the hard work. When the final whistle went, the result stood as a draw in the match itself, while the set score of 3-2 sent the home side through.
For anyone skimming the stats and looking for a quick summary, the highlights were straightforward but decisive: Bolivar struck first, went in ahead at the interval, and then survived Gremio's comeback to stay in front across the tie. The final score on the night was shared, but the outcome over two legs belonged to Bolivar.