This is not a fixture for the faint-hearted punter. Coquimbo Unido carry the slight edge that comes with playing on familiar ground, and their recent WDWWW form at home edges them ahead in our model's assessment. But Union La Calera are not here to make up the numbers — they have shown quality on their travels this season and will not be easy to break down. After weighing every variable, our engine leans toward Coquimbo Unido but does so carefully, registering a win probability of just 48%. Margins will be thin.