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An unhinged man sucker-punched ABC Eyewitness News reporter Tim Fleischer in the Rockaways on Tuesday, police said.

Fleischer, 54, was filming a segment at the corner of Beach Channel Drive and Beach 56th St. in Far Rockaway about 12:30 p.m. when the unidentified man stormed up to him and punched him in the face, cops said.

The assailant then ran off, only to be arrested a few blocks away on Shore Parkway near Beach 57th St. and Rockaway Beach Blvd.

Fleischer was interviewing a local resident while Mayor de Blasio held a press event nearby when he was attacked, officials said.

The newsman was taken to Long Island Jewish Medical Center with a minor injury.

Charges against his attacker were pending. His name was not immediately disclosed.

Police sources said the man is a local resident known to have mental problems.