Coello and Tapia have now won 12 matches in a row to start the current campaign, losing just a single set in the entire season up until now.
Stupaczuk and Di Nenno, who turned 26 on Saturday, made their third semi-final in a row but also lost on Saturday for a third straight time.
After a mirrored result from last week's La Rioja semi-final, Coello and Tapia will take on number ones Juan Lebron and Alejandro Galán in Sunday's final in Chile.
Watch the match highlights below!
