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It's no secret Jack Sock is a Kansas City Chiefs fan. The ATP Finals and NFL UK wanted to make him feel the love, even when he's all the way in London as the NFL season rages on in America.

Sock unwrapped a Christmas gift early to collection of Chiefs gear including a beanie, two hats and a jersey for No. 11 quarterback Alex Smith.

"That’s unbelievable," the Kansas City resident said. "I’ve been living there since I was 10, 11 years old. I grew up in Nebraska but they don’t have a pro team. I bleed red and yellow for the Chiefs that’s for sure."

Note that the 25-year-old was wearing a Chiefs shirt already.

Sock is 1-1 in round-robin play after a loss to Roger Federer and a win over Marin Cilic. He'll play Alexander Zverev on Friday.

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Sock opens surprise Chiefs gift at ATP Finals