Linda Noskova became the first player to reach the WTA Finals semi-finals after beating Coco Gauff 6-3 6-3 in straight sets.
It was a commanding display from the Czech against the world No 4. Noskova made it two wins from two, following up her victory over Marta Kostyuk with another impressive performance. The 21-year-old has yet to drop a set at the WTA Finals, underlining her excellent form during an outstanding season.
Gauff and Jessica Pegula each have one win and one defeat in Group One. Kostyuk, who replaced world No 1 Elena Rybakina after Rybakina withdrew due to illness, has suffered two defeats and been eliminated from the tournament.
Pegula bounced back from her defeat to Gauff to keep her hopes of reaching the semi-finals alive. She beat Kostyuk 6-2 7-5.
Pegula made an explosive start, breaking the Ukrainian in the opening game and securing a second break to take the first set 6-2 with ease.
Pegula closes out second set
Kostyuk offered greater resistance in the second set and put Pegula under more pressure. The American struck with a crucial late break, then served out the match to seal the straight-sets victory.