Rybakina’s Finals exit opens a full group-stage chance for Kostyuk

Rybakina withdrew on Saturday, November 7, with a viral illness, a day before the 2026 tournament begins at Indian Wells, California. Kostyuk takes her place and will face Linda Noskova in Sunday’s opening match, with Coco Gauff and Jessica Pegula her other round-robin opponents. The Finals run from November 8 through November 15.⁠3⁠54

The distinction between the two prizes matters. Rybakina had already secured the year-end top ranking while competing in Tokyo. There is no last-minute opening for another player to take that achievement away. What the Finals lose is their reigning champion—and the possibility of seeing whether the season’s number one could defend her title against the rest of the field.⁠3

The official WTA match notes identify Kostyuk as the first alternate. Because the switch comes before Rybakina has played, Kostyuk can contest all three group matches rather than join a campaign already partly completed. Her place is late-arriving, but her competitive programme is complete.⁠57⁠2

For Noskova, the immediate consequence is a different opponent at short notice. The opener had been billed as Rybakina against Noskova; the November 7 withdrawal announcement supersedes that earlier pairing. Gauff and Pegula must also prepare to face Kostyuk rather than the defending champion. The group’s personnel have changed, but it would be premature to turn that fact into a prediction about who benefits most.⁠64⁠3

Champion.com.ua lists Kostyuk’s opening match for 22:00 Kyiv time on November 8, equivalent to 20:00 UTC, although the precise hour has not been confirmed against an official order of play in the available reporting. The firm point is the replacement pairing: Kostyuk will open against Noskova. Her inclusion also puts her alongside Elina Svitolina in the singles field.⁠2⁠3

Kostyuk therefore receives three separate chances to make an impression, not simply one match against the opponent Rybakina was due to meet first. That is the most consequential detail of the timing: the withdrawal comes late enough to disrupt preparations, but early enough to give the replacement a full group campaign.

Rybakina’s explanation was direct. She expressed sadness at withdrawing, acknowledged the season she had enjoyed and said she would stop competing to recover at home.⁠3

The WTA identifies a viral illness as the reason for this withdrawal. That should not be conflated with her previous exit in Tokyo, where she withdrew from an October 30 quarterfinal with a neck injury. Two withdrawals close together establish a difficult end to the season; they do not establish that the same condition caused both. No particular virus, severity assessment or recovery timetable has been disclosed in the available accounts.⁠3⁠6

Tournament director Garbiñe Muguruza said she had spoken with Rybakina, who had been unable to recover in time after her late-season physical problems. The decision leaves the champion’s title defence over before its opening match, rather than asking her to test her readiness in competition.⁠7

It is an abrupt ending to a season whose achievements are already substantial. Rybakina finishes with 54 wins and 14 losses and four titles: the Australian Open, Stuttgart, the US Open and Ningbo. Her two major victories added to the Wimbledon title she won in 2022, while runner-up finishes at Indian Wells and Toronto showed that her success extended beyond the events she won.⁠3⁠1

Her US Open final victory over Aryna Sabalenka brought her to number one for the first time, ending Sabalenka’s 99-week hold on the ranking. The BBC reports that Rybakina led the tour with 438 aces, hit 1,775 winners and recorded ten victories over top-ten opponents. Those figures explain the scale of the absence without needing to treat the Finals as a verdict on her whole year.⁠1

There was also a compelling title-defence story waiting to unfold. Rybakina won the 2025 Finals in Riyadh undefeated after being the last player to qualify; this year, she was the first singles qualifier. Another title would have made her the first back-to-back winner since Serena Williams in 2014. That opportunity is gone, not postponed.⁠3⁠1

Her next competitive appearance is less certain. Rybakina said she would rest and recover at home before preparing for 2027, and told supporters she could not wait to return to Indian Wells in March. That is an intention to return, not a medical clearance or a confirmed date for her next match. For now, her season is complete—and Kostyuk’s Finals are about to begin.⁠3