Brisbane Heat 147 for 7 (Voll 39, Harris 39, Gardner 2-17) beat Sydney Sixers146 for 8 (Perry 49, Hancock 2-23, Sippel 2-23) by three wickets

Georgia Voll and Grace Harris have helped Brisbane Heat continue their perfect start to the season with a third straight win, beating Sydney Sixers by three wickets in a tight run-chase at North Sydney Oval.

Chasing an under-par target of 147, Harris whacked 39 from 19 and Voll made 39 off 38 before some lusty blows from captain Jess Jonassen (27 off 19) helped get the Heat home with an over to spare.

Voll was named Player of the Match having earlier picked up the key wicket of Ellyse Perry with the ball, as well as taking two catches and affecting a run out.

Sixers' season is now in serious trouble, going 0-3 to start the year after defeats to Melbourne Stars and Sydney Thunder in the past week, on top of the long-term loss of Alyssa Healy to injury.

Perry crunched 49 off 30 for Sixers and looked in good touch, while Chloe Tryon struck 42 from 33.

But they were the only two to get going as Sixers were restricted to 146 for 8 batting first. Heat's bowlers were exceptional with Nicola Hancock, Courtney Grace Sipple and Jonassen each claiming two wickets. Hancock and Sippel went at less than a run-a-ball for their combined eight overs conceding just 23 runs each, while Voll was also miserly in conceding just 17 from her three overs. She was fortunate to pick up Perry with a rank drag down that Perry smacked straight to deep square. But it was a critical moment in the match as Sixers went from 76 for 3 at halfway to post just 70 runs in the last 10 for the loss of five wickets.

Harris got Heat away to another flyer in the chase smashing four fours and three sixes, which meant Voll, Mignon du Preez and Jonassen could control the chase thereafter, albeit late wickets kept things interesting until Mikayla Hinkley iced the game with a six.