Kamil Majchrzak was reunited with the boy.Credit: Instagram
He was later filmed meeting the young boy, named as Brock, and gave him another signed cap and posed for photos with him.
Majchrzak also revealed he had given Szczerek the contact details for Brock’s mother so he could make amends.
“He also wanted to make things right, so I gave him the credentials for Brock’s mom on the same social media I was using to contact her,” Majchrzak said.
“So, maybe he can make things right himself.”
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Szczerek later apologised and said: “Due to the situation that occurred during Kamil Majchrzak’s match at the US Open, I would like to unequivocally apologise to the injured boy, his family, all the fans, and the player himself.
“In the emotions, in the crowd’s joy after the victory, I was convinced that the tennis player was handing the cap in my direction – for my sons, who had earlier asked for autographs.
“This false assumption made me reach out instinctively.”
Sinner has won 25 straight Grand Slam matches on hard court, including the last two Australian Open titles and the US Open last year. He will face fellow Italian Lorenzo Musetti on Wednesday.