The Flames have defeated the Magic 65-64 in a women's SBL semi-final thriller.
Rockingham will progress through to the second week of the finals after winning game one of the series 76-65 last weekend.
Mandurah's season is now over and will look forward to next year.
Alexandra Ciabattoni led the way for the Flames scoring 21-points while Maddison Allen contributed with 19-points.
Taylor Brown was the Magic's best scoring 21-points in a losing side.
The Flames will take on the Perry Lakes Hawks in game one next weekend.