Despite a near final over steal by Sydney Thunder teenager Phoebe Litchfield, the Sydney Sixers hung on to claim their first win in six matches and keep WBBL|06 Finals hopes alive.
The Thunder needed 18 from the final over of the Sydney Smash to steal victory, at Sydney Showground Stadium, and after three consecutive fours to Litchfield (46 from 36) it looked like a Super Over was nearly possible.
However, Player of the Match allrounder Erin Burns showed steely determination on the final ball and hit the stumps clinching the win. The Sixers successfully defending 7/147 with Thunder 8/143 in reply.
Burns claimed four catches, including a caught and bowled, and finished with figures of 3-28 from four overs.
The win keeps the Sixers in fifth position and in touching distance of the top four.
Runs for Alyssa Healy and Dane van Niekerk, together with a disciplined defence of the 148 set to win, were also pivotal to the victory.
From the outset, wicketkeeper-batter Alyssa Healy was determined to get off to a fast start with 12 from the first over.
Healy kept accelerating before departing on 44 from 22 balls with the score on 55 inside the powerplay. South African captain Dane van Niekerk followed that effort with 45 from 39 balls including four sixes.
In a surprise move, captain Ellyse Perry threw the ball to van Niekerk (1-18) to take the second over of the run chase with immediate results removing England International Tammy Beaumont, caught in the deep for 2.
The Thunder then lost Rachel Trenaman (16) in the powerplay followed by the two crucial wickets of England star Heather Knight (16) and Thunder captain Rachael Haynes (27).
Knight had scored more than 350 runs for WBBL|06 heading into the game.