World number two Iga Swiatek will play Daria Kasatkina on Thursday in her must-win match to stay in the hunt for a spot in the WTA Finals semi-finals after Jessica Pegula withdrew from the tournament with a knee injury.

Pegula has withdrawn from the WTA Finals Riyadh presented by PIF due to a nagging left knee injury. She will be replaced in the Orange Group by the first alternate and World No. 9 Daria Kasatkina.

American star Coco Gauff defeated world No. 2 Iga Swiatek 6-3, 6-4 on Tuesday, sealing her spot in the semifinals of the year-end WTA Finals in Riyadh, Saudi Arabia.

Coco Gauff beat defending champion Iga Swiatek 6-3 6-4 at the WTA Finals in Riyadh on Tuesday to reach the semi-finals and ensure Aryna Sabalenka would finish the year as world number one.

Iga Swiatek and Coco Gauff are far from strangers. Swiatek had won 11 of their 12 matches before Tuesday's WTA Finals match. However, it quickly became clear that today's match would be more competitive.

The season-ending event sees Sabalenka and Swiatek battle for year-end world No. 1 for the second year in a row

Coco Gauff will face world No. 2 Iga Swiatek in an exciting clash at the year-end WTA Finals in Riyadh on Tuesday, as the American star looks to build on her solid form.

Coco Gauff claimed just a second win in 13 meetings against Iga Swiatek to book her spot in the semi-finals of the WTA Finals in Saudi Arabia. The American’s 6-3 6-4 victory also ensures Aryna Sabalenka will finish the year as world number one, with defending champion Swiatek no longer able to overtake the Australian Open and US Open winner.

Iga Swiatek and Coco Gauff enjoyed winning starts to their WTA Finals campaigns in Riyadh on Sunday, albeit in contrasting fashion.

World number two Iga Swiatek will play Daria Kasatkina on Thursday in her must-win match to stay in the hunt for a spot in the WTA Finals semi-finals after Jessica Pegula withdrew from the tournament with a knee injury.