World number one Iga Swiatek has claimed a semi-final spot at the WTA Finals with a straight-set win over France's Caroline Garcia.
However, Garcia can still reach the knockout stage with a win on Saturday against Daria Kasatkina, who put American Coco Gauff out of semi-final contention with a 7-6 (8-6) 6-3 win.
"It's the last tournament of the season, so I have kind of nothing to lose," Swiatek said.
"I don't have to worry what I'm going to do next. For sure, I'm giving it 100%, physically and mentally."
Swiatek's victory means she is the second player, after Greek world number five Maria Sakkari, to guarantee her progress from the round-robin stage of the season-ending event in Fort Worth.