ATP stars perform a "Rudolph" holiday sing-along

Everyone from Novak Djokovic to Borna Coric joined in on the holiday fun. (AP Photo)

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: