Instead, it was a 114-run unbeaten fifth-wicket stand between Tristan Stubbs (63 from 41 balls) and Matthew Breetzke (68 from 49 deliveries) that won the day for the Sunrisers, who chased down their target with four balls remaining.
Sent in to bat, the Capitals lost two wickets with one run on the board, but a partnership of 97 for the third wicket between Brevis and Bryce Parsons (30 from 30 balls) took the side to 158 for seven in their 20 overs.
Tall all-rounder Marco Jansen produced excellent figures of 3-10 in his four overs for the Sunrisers.
They also battled at the start of their innings and after losing Jonny Bairstow for a golden duck, the experienced Quinton de Kock followed for 18.
But Stubbs joined Breetzke at the crease with the score on 48-4 in the ninth over and after a measured start, launched an assault in the final overs to get their team over the line.
It was a repeat of the maiden SA20 final in 2023 in which the Sunrisers defeated the Capitals, before they won again in 2024 and then lost to MI Cape Town the following year.