The man fell unconscious at the subway station after he was hit in the head with a rock.
The suspect is a man in his thirties.
According to a statement from the New York City Police Department, the victim was walking on the Q subway line platform when he was confronted by the suspect.
The individual retrieved a rock and pulled himself onto the platform after entering the track area. The rock was used to hit the victim's head, causing him to lose consciousness.
A video posted by the NYPD shows two people, one with no shirt, the other with a backpack, engaging in a fight. A person wearing a backpack is seen being struck by a person who is not wearing a shirt.
The suspect ran away from the train station. The victim, who was in stable condition but had suffered a head injury, was taken to an area hospital by emergency services.
Police can't say if the attack was unprovoked because they don't know a reason for the altercation.
The transit system has been attacked in the past.
A series of high-profile subway crimes in New York City shocked residents, including the death of a woman who was kicked down stairs and beat with a hammer, and the stabbings of at least six people over a single weekend.
A man opened fire on a train in April, wounding more than a dozen people.
The homeless population in New York City was the focus of a subway safety plan.