Oak Grove (Mo.) grabbed a 5-0 lead in the first 2 1/2 innings and defeated Pittsburg American Legion Post 64 7-3 on Saturday morning at Al Ortolani Field in the 18-under Pittsburg State Invitational. Two errors helped Oak Grove scored twice in the top of the first inning, and it padded its lead in the third as a single by Shayton Wright, groundout by Dalton Chaney and single by Cole Chaney each scored a run.