SAN DIEGO (AP) — Keith Williams threw for two touchdowns and ran for another, Dallas Kessman ran for 102 yards and two scores, and Troy McClelland had a late interception to help San Diego beat Dayton 40-29 in a key Pioneer League game Saturday night. On the ensuing Dayton drive, McClelland picked off a Will Bardo pass and returned it 27-yards, to the Dayton 14 and Williams added a 13-yard touchdown run.