Behind Davydova and Ermakova, whose top spot was all but a surprise, came Japanese Olympic and world silver medallists Miya Tachibana and Miho Takeda with 98.000.
Third was the American pair of Bartosik and Koslova, ahead of Spain's Gemma and Mengual and France's Dedieu and Thibaud.
Athens 2004
Russian duet lead way to final
24/08/2004 AT 19:00
The duet free routine qualifying takes place on Tuesday evening, while the duet final will be on Wednesday.
Tokyo 2020
Watch awkward moment music gaffe derails synchronised swimming routine
02/08/2021 AT 15:42
Tokyo 2020
Swimmer Carbonell criticises Tokyo 2020 for choosing between breastfeeding and Olympics
21/07/2021 AT 14:15