Alvarez and Koroleva had 82.800 points, just behind France (85.1667) and Mexico (85.3667). On Friday, the duo scored 80.5913 points to take third in the duet technical.
“I am pleased with their performance, and I have a clear plan to keep them improving,” U.S. Senior National Team head coach Lolli Montico said. “We received positive feedback from the judges and coaches regarding their routine choreography.”
Alvarez and Koroleva will compete in the duet free final on Sunday.
Swimmers from 22 countries are competing at the German Open, including 27 duets, in a preview of the Olympic Games Qualification Tournament. Alvarez and Koroleva will attempt to qualify for the Games at that event in Rio de Janeiro, Brazil, March 2-6.
The duo has been in Europe since mid-January, training with the Italian national team in Rome and with another club in Genoa, Italy. They will compete at the French Open in Paris next week.