Southwest Washington District Class 1A Baseball Tournament First Round Columbia 7, Montesano 3:  William Gross drove in three runs and pitched a four-hitter as the Bruins defeated the Evergreen League champions.  Trenton Howard had two runs batted in, as the Bruins took advantage of five Montesano errors.  Columbia is at Castle Rock for their second game in the tournament today.   Baseball Dufur 19, Riverside 9:  The Rangers run their record to 20-0.   Boys Tennis Hood River Valley 8, Pendleton 0