There are now two John Isners in the world.

Isner and his wife, Madison McKinley, announced the birth of their second baby, John Hobbs Isner, on Instagram on Tuesday.

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The couple welcomed John Hobbs on Sunday, Oct. 20, Isner Sr.'s post said.

"My little girl couldn’t be prouder to be a big sister and my wife couldn’t be more amazing. I don’t know how you do it. You are and will be the best mother possible."

The news comes roughly a year after the Isners' daughter, Hunter Grace, was born, on Sept. 15, 2018.

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In that time, Isner's had another solid season on the court, with a title on the Newport, R.I., grass, and a final at the Miami Open. Now ranked No. 16, he's taking some time to spend with his family at the end of this season, forgoing the Davis Cup in November.

When he returns, perhaps fans will get to see both John Isners out on tour.