Harris unshackled for Big Bash finale

Brisbane Heat have unshackled their 'crazy' this Rebel WBBL season, with skipper Kirby Short hoping big-hitting allrounder Grace Harris is poised to explode in Saturday's final.

Harris boasts the highest strike rate of any recognized batter in WBBL|04, with her 373 runs to date coming at a rate of 150.40 run per 100 balls faced.

She threatened early in last weekend's semi-final against the Thunder, clearing the boundary with a mammoth six in the second over, but departed for 17.

It can be make or break for the 25-year-old, who is averaging 26.64 and has one century and one fifty to her name this season, an approach she summed up perfectly herself when she walked out to bat in that semi-final, telling Channel Seven commentary she was "here for a good time, not a long time".

And it's an approach Short's content to let continue as the Heat eye a maiden WBBL title.

"Grace is a once-in-a-generation player for a lot of reasons," Short said in Sydney on Friday.

"We talk about her being our team 'crazy' in the most loving way possible, in the sense she is her own (person), she can do things with bat and ball that essentially no woman can do in the world in cricket and part of that is her mindset.

"She plays with such freedom and that carefree attitude. Let the shackles off, set her free and what happens, happens.

"You know you'll get full commitment and you know you'll get freedom and you know she won't sweat it either way, so that's really beneficial for the second half of the game."

Harris appeared to be struggling with a knee injury late in the semi-final against the Thunder last weekend, but was set to train with the rest of the Heat squad on Friday afternoon.

Short confirmed her star allrounder was set to play in the decider, noting Harris came into this season fitter and stronger than ever.

"Part of the reason she's launched onto the scene this year with bat and ball is because she's in the best physical condition she's been in and that's made a big difference to her capacity to perform in both facets of the game," Short said.

"So she's actually been travelling quite well which is why we feel good about tomorrow."

Harris, who struck the fastest WBBL century from just 42 deliveries at the Gabba against Melbourne Stars late last year, forms a formidable top-three alongside Australia opener Beth Mooney and hard-hitting first-drop Sammy-Jo Johnson.

"It's a brilliant match up, I've looked at the Heat all year and gone they're a seriously dangerous side," Sixers captain Ellyse Perry said on Friday.

"They've played a really consistent blueprint of cricket and that's to take the game on.

"Obviously with the players at the top of their order but even players down a bit lower and in the field and with their bowling, they're a serious team.

"I'm really looking forward to the challenge tomorrow, I think it's going to be an awesome contest and a fitting final."