Rybakina out of WTA Finals; Kostyuk steps in
The world No. 1 and defending champion says her body is not ready, a day before her opening match at Indian Wells.
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Elena Rybakina withdrew from the WTA Finals on Saturday, citing her fitness.
Ukraine's Marta Kostyuk, ranked No. 10, takes her place and opens against Linda Noskova on Sunday.
Rybakina will finish the year as world No. 1 despite losing the points from last year's title, Tennis Majors reported.