Their rivalry doesn't quite match the bitterness of the Celtic-Rangers football derby or tension between India and Pakistan cricket but the Breakers and Perth Wildcats are the biggest of adversaries on the basketball court and Sunday's matchup isn't likely to be lacking feeling.
Games between the two sides are traditionally feisty but Perth will also bring a desperate element to the match given their chances of finishing the regular season on top of the table, and gaining home court advantage for the playoffs, are teetering.
They were toppled 83-78 by Cairns at home last weekend and won't want to loose any more ground to the Breakers who have the chance to establish a two-game lead on the table with a game in hand.
Perth led 49-38 at halftime against Cairns but the Taipans wrestled control of the match in the third quarter with a 26-9 run. It wasn't the first time Perth have experienced a third-quarter meltdown this season and assistant coach Shawn Dennis said they needed to be mentally stronger when things went against them.
"The worst thing about us as human beings is that we fill our minds with all sorts of things," Dennis told PerthNow. "If things don't quite go right, we fill our minds with all the things that build tension and anxiety and then, of course, it's very difficult to perform."