Amanda Anisimova rallied for a 6-7 (3), 6-4, 6-2 victory over Iga Swiatek of Poland on Wednesday to reach the semifinals of the WTA Finals in Riyadh, Saudi Arabia.

The fourth-seeded Anisimova advanced to face No. 6 seed Elena Rybakina of Kazakhstan, who beat Russia's Ekaterina Alexandrova 6-4, 6-4 to complete her sweep of round-robin matches in the Serena Williams Group.

Anisimova needed two hours and 36 minutes -- the longest match of the week -- to complete her comeback against Swiatek in their winner-take-all clash. The American saved all four break points and broke Swiatek's serve in the final games of the second and third sets.

Anisimova finished with a slight 107-103 edge in total points in the hard-fought match. Swiatek lost back-to-back matches after winning the opening set for

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