NEW YORK (KABC) -- A Polish millionaire and CEO, who took tennis player Kamil Majchrzak's hat from a young fan at the U.S. Open, apologized on social media and said he has returned it.

Piotr Szczerek posted an apology on social media Monday after video of the incident went viral over the weekend. The broadcast showed Szczerek grabbing Majchrzak's hat from a boy after the player's singles match against Karen Khachanov.

"What are you doing?" the child, whose name is Brock, yells as the man stuffs the hat in a bag.

Szczerek, who is from Poland, wrote on Facebook that he made a mistake thinking Majchrzak was giving him the hat for his sons, who had asked earlier for an autograph. In the post, he said he had apologized personally.

Initially, Szczerek did not issue an apology.

After faci

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