Serbia won their third match in a row on the final day of pool stage action at the International Swimming Federation Men's Water Polo World League Super Final.
The reigning Olympic, world and European champions eased to a 15-8 win over the United States at the Aquatic Palace in Ruza in Russia.
It was a repeat of last year's Super Final gold medal match.
The victory sees the Serbians finish top of Group A.
In the other match in that pool Italy, the Rio 2016 bronze medallists, beat Kazakhstan 14-6.
Rio 2016 silver medallists Croatia also boast a 100 per cent record after they won their third match in Group B today.
They defeated Australia 8-3.
Hosts Russia got back to winning ways after suffering defeat at the hands of Croatia yesterday.
They secured second place in Group B with a 12-5 win over Japan.
All eight teams have progressed to the quarter-finals, with those matches due to take place tomorrow.
Serbia take on Japan, Croatia face Kazakhstan, Italy have been drawn against Australia while Russia meet the US.
The final will be played on June 25.
The Super Final is considered to be the most prestigious water polo prize outside of the Olympics and World Championships.
This year's edition of the latter will take place in Hungarian capital Budapest as part of the FINA World Aquatics Championships between July 14 and 30.