OMAHA, Neb. >> Oregon State's Trevor Larnach hit a tiebreaking two-run homer in the top of the ninth inning after Arkansas blew a chance to lock up the national championship, and the Beavers forced a third and final game in the College World Series finals with a 5-3 victory Wednesday night.Cadyn Grenier singled in the tying run after three Arkansas fielders watched his foul ball drop between them.