WATCH: Isner announces Baby No. 2 with exploding serve

John Isner and his wife, Madison McKinley, welcomed their first child, Hunter Grace, just last September, and they've already announced another baby on the way—in spectacular fashion.

"Gender reveals" have gotten pretty showy lately, but having the ATP ace leader do it via a serve is about as big as one can get in tennis:

"Hunter Grace is going to be a big sister! #Isnerpartyof4," McKinley wrote on Instagram.

Isner was one match away from backing up the biggest title of his career at the Miami Open in March, but ultimately fell to Roger Federer, 6-1, 6-4, impeded by a stress fracture in his foot.

Now, on the tail end of the 4-6 weeks he was expected to be sidelined for, he seems to be doing much better, at least by the look of that explosive blue serve.

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