The assault happened on Tuesday afternoon in the 500 block of Spring Garden Street.
Investigators say an unknown man approached the victim from behind, hit him and then took off.
Police believe a woman ran out of the restaurant with the suspect.
The victim was treated at Hahnemann University Hospital.
If you see this suspect do not approach, contact 911 immediately.
To submit a tip via telephone, dial 215.686.TIPS (8477) or text a tip to PPD TIP or 773847. Use this electronic form to submit a tip anonymously.
All tips will be confidential.