On Monday in Singapore, Caroline Wozniacki opened her WTA Finals campaign with a swift 6-2, 6-0 demolition of Elina Svitolina. When the on-court interviewer brought up her improved serve, the Dane cracked a joke:

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"I've been working on it for 20 years now," she said. "I'm glad that finally it starts to click."

The win was Wozniacki's first-ever over the Ukrainian, having lost to her twice this year (in finals, no less) and once last year.

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Wozniacki's performance was a strong way to start her bid for a year-end championship crown, and marks her first victory as an aunt.