A three-star recruit from Mt. Washington, Kentucky who developed into one of the most dangerous stretch fours in the SEC, Willis shot 39.9% from three across 103 career games and led the conference in three-point percentage at 50.0% during league play as a junior. He was a member of three SEC Tournament championship teams and the 38-1 squad of 2014-15, and his 25-point, seven-three performance against Tennessee in 2016 remains one of the best shooting displays of the Calipari era.