The 6-foot-9, 190-pounder also had offers from Kansas, Iowa, Penn State, Pitt, Georgetown, Michigan State and Florida.
With his announcement, four of the top six players in Ohio have made a commitment, including Xenia guard Samari Curtis. He announced in February he will play at Xavier.
Pickerington Central point guard Jeremiah Francis is going to North Carolina while Cincinnati Moeller combo guard Miles McBride has chosen West Virginia.
Sidney point guard Andre Gordon, Trotwood-Madison guard Amari Davis and Gahanna Lincoln forward Jordan Mitchell are the highest-rated players still uncommitted.
Sidney jr. Andre Gordon addresses a 56-45 defeat of Beavercreek in a boys D-I high school basketball sectional semi on Tue., Feb. 27, 2018. MARC PENDLETON / STAFF
Last November, Holtmann signed a class rated No. 23 in the nation and headlined by top 100 prospects Luther Muhammad of Jersey City (New Jersey) Hudson Catholic and Jaedon LeDee of Houston (Texas) Kincaid.
Also heading to Columbus next season are Versailles wing Justin Ahrens and Chatsworth (Calif.) Sierra Canyon guard Duane Washington.