The group winners have a day off on Sunday and the fourth-ranked teams from each group travel to Szeged to play their classification 13-16 semifinals. Meanwhile, the main action will centre on Margaret Island in Budapest with the crossover matches to determine who will join the group winners in the quarter-finals on Tuesday.
Italy, reigning champion United States of America, Australia and Greece have earned the right to a rest day to prepare for their quarter-finals.
They will watch keenly as the third in Group A, Canada, plays second-ranked Group B team Netherlands in the first match-up at the Alfred Hajos National Swimming Stadium at 14:00.
At 15:30, second in Group C, New Zealand, takes on France, who finished third in Group D.
At 17:00, Kazakhstan, third in Group C, has a hard task against 2017 and 2019 silver medallist Spain, second in Group D.
At 18:30, Hungary, runner-up in Group A, will play Argentina, third in Group B.
In Szeged, Colombia and South Africa will clash at 17:00 and Brazil and Thailand will face off at 18:30 to determine which teams play for classifications 13-14 and 15-16 on Tuesday before returning home.