More than 80 Knox athletes represented the school at the CAS Track and Field Championships on Thursday, with three CAS records broken by Knox students.
Max Mandera broke the 15 years 200m dash record in a time of 22.60 seconds.
Tom Shannon broke the 15 years shot put with a throw of 17.46m, beating the previous record of 17.40m.
The Knox 15 years 4 x 100 metre relay team of Max Mandera, Archie Dwyer, Lucas van de Scheur and Cooper Stormonth beat the CAS record in a time of 44.25s, breaking the previous record of 44.38s (which has stood since 2010).
Knox students achieved 56 personal best times or distances in the competition.
The Knox team was supported by a crowd of approximately 500 Knox students and supporters.
The overall winner of the championships was Trinity Grammar School.