Police were called to the 3500 block of South Broad Street, near the South Philadephia Sports Complex, at around 4:30 a.m. for a report of an assault.
When they arrived, they found a 41-year-old man on the sidewalk with injuries to his face, head and mouth.
He was taken to Jefferson University Hospital.
The suspect, a 20-year-old man, was arrested by police.
No other details about the incident or what led up to it have been released.