Ohio State scored 20 first-half points off 15 Ball State turnovers.
The Buckeyes pulled away in the third quarter by scoring 11 straight points, with six from Taylor Thierry, for a 54-26 lead. Gray, Thierry, Watson and Ajae Petty combined to score 25 of Ohio State 31 third-quarter points, while Ball State was held to 16 points.
Thierry finished with 12 points and seven rebounds and Petty added 10 points and eight rebounds for Ohio State (9-0).
Maliyah Johnson scored 10 points for Ball State (6-4).
Ohio State continues nonconference play against Youngstown State on Saturday. Ball State plays at Northern Kentucky on Sunday.
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