Krejcikova had to win her final round robin match to assure herself the final spot in the semis, emerging out of a tiebreaker that left defending champ Swiatek the odd woman out in Riyadh.

Swiatek cannot finish higher than No. 2 in the WTA year-end rankings. However, she can still repeat as the WTA Finals champion. It just starts with some help from Gauff today. If Swiatek does advance to the knock-out round, she will need to continue playing at a high level to pull off the incredible comeback.