The robbery happened around 2:46 a.m. in front of the Jewel-Osco at 3531 North Broadway, between Addison and Cornelia, said authorities.
Two black offenders, a male with dreadlocks and a female, approached the victim and stole an iPhone, said police.
Investigators said one thief was armed with a knife.
After the armed robbery, both suspects fled northbound on Broadway from Brompton Avenue, according to police dispatch reports.
At 2:49 a.m., police stopped two possible suspects at Wilton and Cornelia Avenues.
As of 3:16 a.m., it was still unclear if the suspects were still at large.
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