In a stunning performance on Sunday, Dominika Cibulkova upset world No. 1 Angelique Kerber, 6-3, 6-4 to win the WTA Finals in Singapore. The victory is the Slovak's biggest title by far, and will raise her ranking to a career-high No. 5.

Cibulkova ended her five-match losing streak to the German on her fourth championship point with a net cord and a roll.

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And the congratulations came pouring in.

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The 27-year-old gave an emotional victory speech during the awards presentation, calling the day the "biggest moment in her career."

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There's little doubt that big celebrations are in order for the new world No. 5.