It happened around 7:30 a.m. in the 5900 block of Market Street.
There was no immediate word on the victim's condition, but he was able to give police a description.
The attacker is described as a black man in his 40s, about six feet tall and 200 pounds. He has a mustache and was wearing a white hat, red t-shirt and blue jeans.
The victim said he did not know his attacker.