The Bard was right: All the world's a stage, and we're merely players.

Before their dramatic three-setter in the semifinal round of the WTA Finals, Serena Williams and Caroline Wozniacki played nice and attended a Mariah Carey concert together across the way from their own venue in Singapore. What's more, they met up with Mariah for some illustrious selfies thanks to tickets supplied by the WTA tour itself.

Wozniacki posted an Instagram (read: Instaglam) video from the pair's prime seats that shows Carey performing her hit "We Belong Together":

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Each snapped a selfie with the singer dubbed The Voice as well. Naturally, Serena posted her photo with the hashtag #Divas:

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Your trusty Spin keeper would love to have been a fly on the wall if any talk came up between Carey and Wozniacki about how to deal with a public, fairly embarrassing breakup.

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Serena, who defeated Wozniacki by a 2-6, 6-3, 7-6 (6) count a day later, noted in a press conference that she'd prefer her own life story to play out rather splendidly as a Broadway musical in lieu of more dramatic treatment on television or film. About watching the final round-robin match between Ana Ivanovic and Simona Halep that would decide whether Serena made the semifinals, she said it played out "like a drama on Netflix," with Halep ultimately winning the lone set that moved Serena on to the next round. Ultimately, it also allowed Serena the chance to stare down Halep herself again—that in the final.

When a reporter inquired about her rating of the Singapore event on a scale of 1 to 10, Serena said, "My first album I ever got in my life was Mariah Carey, so the fact that they provided tickets to Mariah Carey, I give it an 11."

She's going to need to take her own performance to 11 to turn around her results against Halep in this week's WTA Finals. After a round-robin drubbing in which she won just two games (her worst loss since 1998), Serena seeks to resurrect her fortunes in the championship round against a diminutive but obviously formidable foe, one who relished, as did her coach, the sweet taste of victory against Serena just days ago.

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