No. 6 seed Elena Rybakina stormed to a 3-6, 6-1, 6-0 victory against No. 2 Iga Swiatek on Monday to move into first place in her group at the WTA Finals in Riyadh, Saudi Arabia.

Rybakina's stunning rally, coupled with Amanda Anisimova's victory against Madison Keys, guaranteed the Kazakh's spot in the semifinals with a 2-0 record in the Serena Williams Group.

Anisimova will face Poland's Swiatek for the group's No. 2 spot in the semifinals after overtaking fellow American and No. 7 seed Madison Keys 4-6, 6-3, 6-2. Anisimova and Swiatek are both 1-1 in the round-robin competition.

Rybakina won 12 of the last 13 games to become just the second player this year to beat Swiatek after dropping the opening set. Keys did it at the Australian Open.

"She brings so much intensity to the court,"

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