A KID who was left devastated when a cap signed by Kamil Majchrzak at the US open was snatched from him has been reunited with his sporting hero.

The child, whose name is Brock, watched on as Majchrzak scored the biggest win of his career against Karen Khachanov on Thursday.

But a shocking scene following the 29-year-old Pole's victory garnered horrified reactions from observers.

Majchrzak was filmed removing his cap and trying to hand it to Brock, who was stood in the crowd .

Yet a brazen onlooker stood next to the boy swiped it instead and quickly stuffed it into his bag.

The kid looked devastated as the man took off with the hat, while Majchrzak hadn't noticed the shocking moment.

Brock appears to say "what are you doing?" to the man.

And the clip soon went viral, sparkin

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