Muchova withdraws from WTA Finals; Shnaider replaces her vs. Andreeva

Karolina Muchova, the 30-year-old Czech tennis player, has withdrawn from the WTA Finals due to a gastrointestinal illness. She was set to face Mirra Andreeva on the final day of round-robin play in the season-ending championships. As Muchova's replacement, Diana Shnaider of Russia will make her WTA Finals debut in singles after qualifying in doubles last year with Andreeva.

Shnaider, who went 0-3 in round-robin play a year ago, stands to gain $230,000 and 200 WTA Tour rankings points from the match. The WTA Finals are currently underway at Indian Wells Tennis Garden, a $10 million event. Top-ranked Elena Rybakina also withdrew from the tournament earlier this week due to a viral illness and exhaustion.