The pair performed the same duet routines they wowed the crowd with at last summer's Olympic Games.
At London Randall and Federici finished ninth but they had more to shout about in Italy as they ended the competition in sixth place.
They began with a score of 86.800 for their tech routine and followed that up with 86.740 in their free routine prelim to reach the final.
Tokyo 2020
Watch awkward moment music gaffe derails synchronised swimming routine
02/08/2021 AT 15:42
The duo then repeated their score in the free routine final to finish on 173.540 – less than four points shy of fourth place.
Tokyo 2020
Swimmer Carbonell criticises Tokyo 2020 for choosing between breastfeeding and Olympics
21/07/2021 AT 14:15
Tokyo 2020
USA's Artistic Swimming performance at London 2012
27/04/2021 AT 10:35