He averaged 26.1 points, 10.0 rebounds, 3.1 steals and 3.0 assists during his senior year and was selected to the "USA Today" All-USA First Team.
В последнем сезоне за свою школу Харрисон в среднем набирал 26.1 очков, 10.0 подбора, 3.1 перехвата и 3.0 передач за игру.