The Russians received an estimate of 97.9000 points for their performance.
Second place went to Huang Xuechen and Sun Wenyan from China with a score of 96.2333.
The third position is occupied by Marta Fedina and Anastasia Savchuk from Ukraine (94.9333).
Preliminary competitions in the technical program will be held on August 3.
Earlier it was reported that the Russian synchronized swimmers turned on the wrong music at the Olympic Games in Tokyo.