Grillo just finished his sophomore season at the University of Rhode Island. As a freshman, Dom led the Rams with 15 relief appearances. He posted a 0-1 record with a 3.78 ERA. Grillo attended North Kingstown High School where he went 30-3 with a 0.69 ERA as a three-year starter. Dom earned All-State honors his junior and senior years. He earned All-Star accolades twice and All-Division honors 3 times. As a sophomore, Grillo was a finalist for the Rhode Island Player of the Year Award.