Nick Kyrgios and Thanasi Kokkinakis are a dynamic duo that are basically best friends during the Davis Cup. Together, they took on the "Dad Joke" challenge, spitting very "punny" one-liners, such as:

"What's the difference between a snowman and a snow woman? Snowballs."

"Why couldn't the koala find a job? It didn't have the proper koalafications."

And they don't get much better from there. The two Aussies have been having a blast, even if their tennis game is far better than their jokes.

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Kyrgios leads the team, which includes John Peers, John Millman and Jordan Thompson. Kokkinakis is on site, obviously, but was replaced in the lineup last-minute by Millman.