Alexandrova has been called up to substitute for Keys following Andreeva, who holds the ninth-ranked player, chose not to sign in because of not being fit to play today, according to the WTA.
Recent coverage have emphasized issues about how competitors are being let down by the WTA.
Welcome to another day at the WTA Finals. While both matches offer thrilling action, the main event features Iga Swiatek competing against Anisimova.
Their last meeting at Wimbledon four months ago was remarkably one-sided, with Swiatek achieving a commanding double bagel victory. However, Anisimova made an impressive comeback just weeks later, overcoming Swiatek in straight sets during the New York tournament.
Today's match 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 face Alexandrova instead of Madison Keys. Keys withdrew due to illness in what constitutes a dead rubber, allowing the world No 10 to participate. The Kazakh star aims to maintain her unbeaten record, having previously defeated both her Polish rival and Anisimova to secure her last-four spot.
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