Polyakova's appearance in the FINA Worlds marked her fourth international event this summer.
Seven of the 15 Bruin participants at the L.A. Invitational reached championship finals.
Next up for the reigning U.S. 1500 Free champ are the FINA World Championships in August in Russia.
Éloïse Bélanger, a member of Canada's National Team, will join the Bruin diving program this fall.
As a team, UCLA was designated a Scholar All-America Team, as were eight individuals.
Eleven swimmers swam in Santa Clara last weekend, while Maria Polyakova shined in Azerbaijan.
Ciara Monahan placed fifth in the 1-Meter event to qualify for August's Senior Nationals.
Annika Lenz, Ciara Monahan and Maria Polyakova are all taking part in summer competition.
Campbell matched her 11th-place finish at the 2014 10K event.
The Pac-12 Newcomer of the Year competed in the 3-Meter event.
It was awards week for the Bruins for both their in and out of the water success.
The freshman is the fourth Bruin diver to be named league Newcomer of the Year.