Grant Lucas Riller was born February 8, 1997 in Orlando, Florida. He is the son of Marcus and Bonny Riller and has one older brother and two sisters. The combo guard attended Ocoee High School, also in Florida, where he joined the varsity squad as a ninth grader. On Dec. 28, 2014, Riller scored 53 points (a school record) in a finals victory over Leesburg in the Ocoee Great 8 tournament. Riller averaged 29.1 points per game as a high school senior. Riller then attended the College of Charleston from 2015 to 2020. A preseason knee injury forced Riller to miss his true freshman season. After four seasons at Charleston, Riller was a three-time All-CAA First Team selection (2018, 2019 and 2020). Fans can follow the Florida native on Twitter @grantriller97.