Williams came to IU after playing for head coach Steve Smith at Oak Hill Academy. He was ranked No. 47 by Rivals.com and No. 10 at his position, ranked No. 67 overall by Scout.com and No. 17 at small forward, and ranked No. 57 in the ESPN100 rankingsHe scored 21 points to go along with five rebounds and four assists in just 18 minutes at the Derby Festival Basketball Classic, where he was named MVP. He was named Gatorade Player of the Year for the state of Virginia and led Oak Hill Academy to a regular season record of 34-5 and an appearance in the National High School Invitational. He averaged 16.2 points, 7.5 rebounds, 4.0 assists, and 2.0 blocks during the regular season, compiling nine double-doubles and played in the Jordan Brand Classic .