Leave it to David Letterman to make Novak Djokovic play the straight guy in a comedic encounter. The funnyman commonly known as Dave will retire in late summer 2015, but not before inciting bellies full of laughs opposite the likes of Djokovic.

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Dave made like most of us and remarked incredulously at Djokovic's flexibility on court: "That looks like you injured yourself."

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The world's No. 1 player talked about growing up in Serbia as well, and how his parents met on a ski slope:

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Laid-back and dressed down, Djokovic certainly holds his own with the world's No. 1 cranky jokester.

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