His fireworks propelled Perth to 171 for six off their 20 overs with Sydney all out for 92 from 16.2 overs in reply for a 79-run win.
It was revenge for the Scorchers who were beaten by their arch-rivals in the decider last season.
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“What can I say, the guys deserve this,” said man-of-the-match Evans.
“They’ve sacrificed a lot, not being able to get home and stuff like that. I’m just really proud we got over the line today.”
The clash culminated another tournament marred by the pandemic with the game played at Melbourne’s Marvel Stadium with the roof shut after torrential rain.
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The Scorchers nominated the venue as their “home” ground as they are unable to return to Western Australia, with the state border still shut to the rest of the country due to Covid concerns.
“Congratulations to Perth, the best team all year and probably fitting you won tonight,” said Sixers skipper Moises Henriques.
Henriques won the toss and opted to bowl and it looked to be a good decision when the Scorchers slumped to 25 for 4 after six overs.
But an incredible 104-run partnership by skipper Ashton Turner (54) and Evans flipped the match in their favour.
Evans smacked four boundaries and four sixes in his explosive knock with Nathan Lyon and Steve O’Keefe both taking two wickets each.
Perth have been kings of defending low totals this season and the omens didn’t bode well for Sydney when they lost Hayden Kerr cheaply in the second over.
Daniel Hughes hit a quickfire 42 before being run out to give them a glimmer of hope, but it was always an uphill battle with Nicholas Bertus (15) and Jay Lenton (10) the only other players to make double figures.
Andrew Tye did the damage with 3-15 off three overs. He was on a hat-trick at one point after dismissing Sean Abbott and Ben Dwarshuis, only for Lyon to fend off his third ball.
The Scorchers and Sixers, who are three-time champions, are the only two clubs to have clinched multiple titles in Australia’s T20 competition.