Ilysova helped Milwaukee built a 28-point lead in the third quarter.
The first half was a battle between No. 1 picks. Former Connecticut star Drummond and former North Carolina player Henson each had 10 points and blocked two shots in the half.
With the second pick in the NBA draft, the Lakers take Brandon Ingram.
The Boston Celtics selected California forward Jaylen Brown with the No. 3 overall pick of the 2016 NBA draft on Thursday night.
The 76ers select Ben Simmons from LSU with the No. 1 pick in the NBA draft.