Ekaterina Alexandrova has been called up to replace Keys following Mirra Andreeva, who holds world No 9, decided against participating due to not being fit to compete in today's matches, as stated by the WTA.
Current coverage have emphasized issues about how competitors are being let down by the tournament organizers.
Welcome to another day at the Women's Tennis Finals. While both matches promise excitement, the main event features Swiatek facing off with Amanda Anisimova.
Their previous encounter at Wimbledon four months ago proved extremely lopsided, with the Polish star achieving a commanding 6-0, 6-0 victory. Nevertheless, the American player made an impressive recovery just weeks later, overcoming Swiatek in convincing fashion during the US Open quarter-finals.
This crucial encounter marks the third chapter of their competitive rivalry, with the victorious player progressing to the semi-finals in the Saudi Arabian capital.
Earlier in the day, Rybakina will compete against Ekaterina Alexandrova instead of the originally scheduled opponent. The American player pulled out due to illness in what represents a dead rubber, allowing the world No 10 to participate. The Kazakh star aims to maintain her unbeaten streak, having already beaten both her Polish rival and Anisimova to secure her semi-final position.