The top eight stars on the WTA tour are in Istanbul, Turkey, this week for the season-ending championships. One of them is known to be a sure-fire karaoke star, and the leaders of the house band at the event's opening party apparently knew that. See Serena Williams awkwardly take the stage here:

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Victoria Azarenka, Li Na, Agnieszka Radwanska, Petra Kvitova, Sara Errani, Jelena Jankovic, and Angelique Kerber are with Serena in Istanbul. Here's a look at what this octet of powerful women wore for their official group portrait. The Spin likes what each is wearing—how rare—and once again appreciates the amazing tan line on Li's wrist.

What's more, you can view the official WTA Championships draw ceremony in its entirety here, with some entertaining featurettes, including Billie Jean King being feted, as she should be, for the billionth time:

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Who do you think will win the event?

Thanks to [@JoseGut19 for the Serena video.]

Got a thought, a tip, or a point to make? Hit me on Twitter @jonscott9.