The Rebels, ranked No. 1 in Class 4A and No. 4 nationally in USA Today's Super 25 poll, improved to 7-0 overall and 3-0 in Region II-4A with their annual grudge match with Gaffney awaiting next week in Gaffney.
Riverside (1-6, 0-3) was limited to 48 yards from scrimmage – 22 rushing and 26 passing – on 38 plays from scrimmage.
Junior quarterback Shuler Bentley led Byrnes, completing 10 of 12 passes for 242 yards and four touchdowns, while wide receiver Akia Booker had three catches for 105 yards and a score.