Happy holidays from the ATP World Tour, where all the gents wield mighty racquets and few can carry a tune. But that's the fun of opportunities like this, in which some of your favorite singles and doubles stars have a go at "Rudolph the Red-Nosed Reindeer." See all the follies here:

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Knowing that world No. 1 Novak Djokovic, the Djokester in Chief, appears in the clip might make you think he seizes control of the situation. But you'd be wrong. Djokovic is rendered a bit player, as the likes of Bob and Mike Bryan, Jack Sock, and John Isner feature prominently. In truth, Horia Tecau and Jean-Julien Rojer do a lot of the "heavy lifting," as it were, adding finger-snaps and real rhythm to the proceedings. Andy Murray and Jamie Murray, fresh off their domination in the Davis Cup final, appear separately. And then even Bernard Tomic gets his licks in, in a corridor of some kind away from the set, which somehow seems entirely apropos.

Gilles Simon kicks off the 1:30 video with some amusingly out-of-tune warbling. He's followed by (in no order) Grigor Dimitrov, Borna Coric, Dominic Thiem and Marcelo Melo. Roger Federer, Kei Nishikori and Stan Wawrinka are all on stand-by, non-singers who are perhaps just glad to be along for the (sleigh) ride. Fittingly, Djokovic does end up closing the show.

Be safe and warm as the calendar year comes to a close, all!

Follow Jon on Twitter @jonscott9.