Michael Carberry smashed 50 off 36 balls for the Scorchers ??? his third fifty in a row at the Waca ??? as the home side posted 144-7 from their 50 overs.
Kevin Pietersen hit 31 ??? with a huge switch-hit six ??? in reply, but it wasn???t to be enough with a collapse of seven wickets for 40 runs consigning the Stars to defeat.
Andrew Tye starred with the ball for the Scorchers with figures of 4-18 as they bowled the Melbourne side out for 126.
The Scorchers won the toss and opted to bat in front of a capacity home crowd in Perth but the impressive John Hastings (3-27) picked up two early wickets to silence them ??? tournament top-scorer before the game, Michael Klinger (5), and captain Adam Voges (3) falling cheaply.
That brought Carberry to the crease, who used the depth of his crease well throughout his knock, and along with Shaun Marsh (35 off 34 balls) got the Scorchers innings going.
The Hampshire man had been dropped at cover off the bowling of Clint McKay when he was on nine, an error which proved costly as he went through to fifty.
He was dismissed straight after reaching the milestone though, picking out Hastings at long-off when looking to clear the boundary off Michael Beer (2-25).
Nathan Coulter-Nile smashed two big sixes on his way to 22 off nine balls, but when he was dismissed by Hastings in the penultimate over, the score was 141-7 and the Scorchers could only add a further three runs to the total.
McKay bowled a maiden final over to Tye ??? who swung and missed at six practically identical deliveries ??? but he more than made up for his efforts with the ball in hand.
He picked up Luke Wright (31 off 25 balls) and Peter Handscomb ??? hundred hero in the Stars??? win between these sides on Wednesday ??? for a second ball duck in the 11th over.
It proved to be a crucial momentum shift after Kevin Pietersen had smashed the Scorchers 43-year-old talisman, Bradd Hogg, for an incredible switch-hit six the over before.
Only 11 runs came from the following three overs and it led to the dismissal of the frustrated Pietersen, who top-edged through to Sam Whiteman behind the stumps when charging down the pitch to Coulter-Nile (2-31).
That followed the wicket of Rob Quiney (7) ??? who pulled one straight to the pumped-up Hogg at fine leg ??? in the same over as the Scorchers struck another double blow.
Hastings (22 off 15) smashed some late blows and when he was dropped by Carberry a ball after hitting Jason Behrendorff for a huge six over square-leg, there was a glimmer of hope for the visitors.
But Tye soon extinguished that with two more wickets in his last over ??? including bowling the dangerous Hastings ??? before the Stars finished all out for 126 in the final over.