Coello and Tapia are in their eighth consecutive finals, reaching it in all events they have played and winning their previous seven.
Sanz and Nieto won the opening set without conceding a break point, but were met with an avalanche of offensive padel in the second and third sets, claiming just two of the next 14 games.
The Spaniards go their separate ways after their first and last tournament together, but will look back on a very positive week in Vienna.
Watch the semi-final highlights in the video below!