Singapore contendor Caroline Wozniacki revealed that her go-to karaoke song is Cher's 1989 hit "If I Could Turn Back Time."

Ahead of the tournament, Wozniacki caught the Backstreet Boys live in Singapore. She sang there, too.

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It's far from the only singing performance tennis has produced this season. Remember when the Backhand Boys (Roger Federer, Tommy Haas and Grigor Dimitrov) tried to masterChicago's "Hard to Say I'm Sorry"?

Vocals aside, Wozniacki is performing even better on the court. She's currently 2-0 in the group stage of the WTA Finals, having lost just four games. The 28-year-old started with a dominant 6-2, 6-0 win over Elina Svitolina, who had beaten her twice earlier in the year, both times in Premier 5 finals.

The victory included a backhand lob that earned hot shot of the day accolades, after which Wozniacki won 10 consecutive games:

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On Wednesday, Wozniacki blew past world No. 1 Simona Halep, 6-0, 6-2 to guarantee her a spot in the semifinals.