A man sucker-punched an elderly stranger in an unprovoked attack on a Brooklyn street corner, police said on Thursday.

The 74-year-old woman was at the intersection of Rockaway Parkway and Farragut Road in Canarsie around 10:30 a.m. on Friday, when the man suddenly punched her in the face, without saying a word.

The man then walked off, leaving his victim lying on the ground. The woman was later treated for a sprained wrist, cops said.

Police released video of the violent creep, who is seen wearing a knit cap, black jacket and blue jeans.