A notable all-round display from Australian all-rounder Knott helped The Blaze to a helter-skelter victory over Yorkshire.
Last year’s semi-finalists had already qualified for The Kia Oval showpiece but clinched their eighth win in 12 games thanks to bowling the hosts out for 122 and recovering from 41-5 in the eighth over of their chase.
Left-arm swing bowler Grace Ballinger returned 3-31, while Charley Phillips and Kirstie Gordon struck twice apiece added to two run outs.
But Knott’s miserly 1-19 from four overs of off-spin was followed up by a brilliant and composed career best 84 not out off 57 balls.
Yorkshire had three batters make 23 and captain Lauren Winfield-Hill top-scoring with 29 as they missed the chance to claim a fourth straight win.
Academy leg-spinner Holly Garton impressed with 2-17 as The Blaze won with five balls remaining.