Before the ATP Finals in London begins, the Top 8 had a little fun with the Mannequin Challenge, another viral sensation (somewhat similar to the Harlem Shake and the Ice Bucket Challenge crazes). This time around, a group of people stand as still as possible in various poses and positions (to replicate store window displays), while a camera sweeps through them. After some time, everyone goes back to normal as if it didn't happen.

The challenge ended with this awesome selfie.

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The ATP World Tour finals kicks off on Sunday with Novak Djokovic taking on Dominic Thiem and Milos Raonic facing off against Gael Monfils.

Click here for a preview of the John McEnroe group and here for a preview of the Ivan Lendl group.

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