The NBL finals series in 1983 consisted of the divisional finals (which was a round-robin fixture for the top eight teams), two semifinal games, and one championship-deciding grand final. The finals were contested between the top eight teams of the regular season, with the final four weekend split between two Melbourne venues – Burwood Stadium and Kilsyth Stadium.
Updated to match(es) played on 18 June 1983. Source: NBL.com.au
The NBL tie-breaker system as outlined in the NBL Rules and Regulations states that in the case of an identical win–loss record, the results in games played between the teams will determine order of seeding.