Kei Nishikori and John Isner were involved in a funny exchange on social media after the duo practiced together on Saturday.

While the the 6-feet 10-inch Isner is popular for his big serve, Nishikori is better known for the other aspects of the game.

So, when they hit the court together, they didn’t mind having a bit of fun on Twitter.

Nishikori later tweeted a picture of himself with Isner, humorously captioning it: “Very good practice with @JohnIsner today. Very nice of him to come hit. #heightdifference #CanIHaveThatServe.”

Isner, too, showed off his sense of humour, replying: “You’ve got a deal if you give me everything else.”

Very good practice with @JohnIsner today. Very nice of him to come hit. #heightdifference #CanIHaveThatServe pic.twitter.com/Hy3BVBYCT3

— Kei Nishikori (@keinishikori) January 27, 2018

That’s how you roll, peeps!