The Bearkatz (23-5, 7-1) led 21-10 after the first period and 37-20 at the half.
Spencer Caraway (11 rebounds) and Kody Caraway paced Melbourne with 19 points apiece.
Dalton Grigg added 11 points and 13 boards.
Cody Cooper and Sam Cooper finished with six points each, while Derek Baird, Brice Taylor and Justin Rich logged three points apiece.
The Lady Katz (16-6) ran their conference mark to a perfect 8-0 with a 61-48 victory over the Lady Warriors earlier in the evening.
Maggie Jo Cooper scored 21 points to lead Melbourne, while Sara Beth Adams logged 12 points.
Karli Gillihan had nine, Amanda Treat eight and Kenzi Gillihan six.
Kaylee Ables finished with five points.
The junior Lady Bearkatz opened the night with a 39-22 win over Cotter.