Six months ago Garcia wasn't even ranked inside the world's top 50.
The Belarussian has defeated the world No.3, No.2 and No.1 en route to the title match at Fort Worth.
The French No.1 reacts to her latest win at the end-of-season showdown.
With one final round of matches remaining, two players have a chance to join Sakkari in the last four.
It was an almost perfect start for the Pole and her bid to win the end-of-season event for the first time in her career.
Despite a lack of fans in the stands, there was plenty of entertainment on the court at the season-ending extravaganza.
The world No.2 is bidding to claim the biggest trophy of her career this week at the Dickies Stadium in Fort Worth.
Ons Jabeur is among four players seeking to win the prestigious title on their first attempt.
The man who guided Garcia through the majority of her success this year has walked away ahead of one of the biggest WTA events of the...