The final stage of the Mini Children’s K13 Category of the Greek National Water Polo Championship took place during September 30, 2021 - October 3, 2021 in the Glyfada Nautical Sports Club swimming pool.

Three students from Psychico College Junior High School participated in the Championship with their team, and ranked in 3rd place: Konstantinos Papanikolaou (Grade 1, Junior High School), Panagiotis Vagias and Nikos Georgiadis (Grade 2, Junior High School).