Sabalenka has now won three tournaments in the first week of a season after Shenzen in 2019 and Abu Dhabi in 2021.
She will meet either teenage qualifier Linda Noskova or top-seeded Ons Jabeur in Sunday's final.
The three countries who won their "city finals" will be joined in the last four in Sydney by the top runner-up, Italy, in the $15 million event, which replaces the short-lived ATP Cup.
The Czech-American tennis player, who dominated the sport in the 1980s, issued a statement through her representative, saying battling cancer is "going to stink for a while but I’ll fight with all I have got”.
Australian government granted the Serbian tennis player a visa to travel to the Grand Slam event, saying it has decided to revoke the decision to cancel his visa after considering all relevant factors.
Serbian Djokovic beat Norwegian Casper Ruud 7-5, 6-3 in Turin to match Roger Federer's record of six titles in the year-ending tournament for the top-ranked players.
In January this year, Serbian tennis star was banned to enter Australia till 2025 when he refused to be vaccinated against Covid-19.
Caroline Garcia becomes the second Frenchwoman to win the season-ending event after Amelie Mauresmo in 2005.
Aryna Sabalenka, who calls her qualification to the event a "miracle", sets up a title clash with Caroline Garcia at the season-ending WTA Finals.
Iga Swiatek saved five of the six break points she faced and broke Caroline Garcia four times on the way to a victory that avenged her three-set loss to the French player in the quarter-finals in July.
Pictures of tennis rivals Roger Federer and Rafa Nadal crying after combining for Team Europe in a doubles match in London went viral on social media.
Tearful tennis star ends his remarkable career with an agonising doubles defeat alongside long-time rival Rafael Nadal at the Laver Cup in London.
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