Ballentine graduated from Southwind High School early as a junior. His junior season he had 45 tackles, 6 interceptions and 12 pass breakups. He only played 1 year of varsity football. He also played basketball and ran track in high school.
His freshman year in 2010 he had 13 tackles and 2 pass breakups while starting 1 game. His sophomore season he had 28 tackles and 1 pass breakup while starting several games and having 2 tackles for loss. His Junior season he had 3 interceptions and 66 total tackles to go with 5 pass breakups. He also was an All C-USA Honorable Mention that year as well. His Senior season, he was a preseason 4th team All C-USA selection and finished the year with 58 tackles and 5 pass breakups during the year while starting all 12 games.
Ballentine did not attend the NFL Combine but was drafted with the last pick of the 2014 NFL draft at 256th. Since he is Mr. Irrelevant, he gets to attend a 1-week vacation at Newport Beach, California and will receive the Lowsman Trophy which is given every year to the Mr. Irrelevant. Ballentine later signed a 4 year, $2.27 million contract.