Iga Swiatek, Coco Gauff, Jessica Pegula and Barbora Krejcikova, will play their second round-robin match on day 4 of the WTA Finals in Riyadh, Saudi Arabia.

RIYADH, Saudi Arabia — Jessica Pegula withdrew from her last match at the WTA Finals because of a left knee injury on Wednesday. The American, who lost her first two matches and was already eliminated from semifinal contention at the season-ending tournament, will be replaced in the Orange Group by first alternate and ninth-ranked Daria Kasatkina.

American sixth seed Jessica Pegula has withdrawn from the WTA Finals in Riyadh with a left knee injury, the tournament announced on Wednesday.

Aryna Sabalenka has clinched the year-end No. 1 spot in the women’s rankings for the first time RIYADH, Saudi Arabia — Aryna Sabalenka clinched the year-end No. 1 spot in the women’s rankings for the first time when Iga Swiatek lost at the WTA Finals on Tuesday.

Aryna Sabalenka of Belarus clinched her first-ever, season-ending world No. 1 ranking on Tuesday. In Riyadh, Saudi Arabia, for the WTA Tour Finals, Sabalenka earned the top spot officially after Coco Gauff defeated Poland's Iga Swiatek 6-3,