They play 'staying alive' by the Bee Gees in between games which seems really apt for Zheng.
Sabalenka is now serving for the match.
She races into a 40-0 lead with three match points, surely this is the moment she was dreaming of last night.
The nerves seem to be there as she sends two shots wide of the base line to bring Zheng back to 40-30.
Before we know it, the game is back to deuce after a great drop shot by Zheng.
Zheng is making Sabalenka work for this win as she pulls it back to deuce from match point once again before putting the pressure right on with a break point.
Sabalenka lets out a huge roar as she wins the point to take herself to championship point once again.
She plays a forehand return across court to seal the victory.
Great reply by Zheng who gets her game going and finds herself with three breaks points after racing into forty-love lead against the serve.
Sabalenka is never going to make anything easy for her opponent and continues with her big hits to win the next three points to tie the game up at deuce.
She holds her serve brilliantly when she looked destined to be broken after the first three points of the game.
She has nonetheless fully merited her arrival in the showpiece to back up her showing at Flushing Meadows last summer.
I believe in the destiny. I try to not let other things affect me, even if destiny. You know, when everything is working well, I believe in the destiny. But if the destiny doesn't go on my side, I don't believe that at all. Only depends where destiny goes.