Jury members are expected to fill out a questionnaire.
The nine other men are expected in court next month.
If convicted, all 14 men could face life in prison.
On June 20, the teen was chased down by a group of alleged members of the Trinatrios gang. When he sought shelter at the bodega, he was dragged out.
After being beaten, stabbed repeatedly and slashed across the throat with a machete, Guzman-Feliz, ran back inside the store. Surveillance video captured the incident, including a person inside the bodega apparently pointing the mortally wounded teenager away from the store.
A person was then seen pointing, telling to run to a nearby hospital because 911 had been called and an ambulance was taking too long to respond. Guzman-Feliz died in an attempt to reach the hospital.