Ekaterina Alexandrova has been called up to substitute for Keys after Andreeva, who holds world No 9, decided against participating because of not being fit to compete today, as stated by the WTA.
Recent coverage have highlighted issues about how competitors are facing challenges by the WTA.
Welcome to the latest installment at the Women's Tennis Finals. While both matches promise excitement, the main event showcases Iga Swiatek facing off with Amanda Anisimova.
Their last meeting at the Wimbledon Championships earlier this season proved extremely lopsided, with the Polish star securing a decisive 6-0, 6-0 win. However, the American player delivered a remarkable comeback shortly after, 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 next round in Riyadh.
Before that contest, Elena Rybakina will face Alexandrova instead of Madison Keys. Keys withdrew due to health issues in what constitutes a dead rubber, allowing the tenth-ranked player to step in. The Kazakh star aims to maintain her perfect streak, having previously defeated both her Polish rival and Anisimova to claim her last-four position.