World number two Iga Swiatek and world number three Coco Gauff have both secured their spots in the semi-finals of the WTA Finals in Cancun, Mexico.
Poland’s Swiatek confirmed her position with a 6-1 6-2 win over world number six Ons Jabeur.
Earlier, Gauff claimed a victory for US tennis fans in a battle of two of the major champions from this year.
She defeated Marketa Vondrousova 5-7 7-6 (4) 6-3 in the final round of group play on Friday night, ending the Czech player’s chances of advancing to the semi-finals.
The win was another feather in the cap for Gauff, making her the first teenager to make the final four of the year-end championships since Caroline Wozniacki in 2009.
She will now face Jessica Pegula while Swiatek takes on Aryna Sabalenka.