Rookie Mauricio Dubon collected a single, a double and a home run to help San Francisco build a lead, and the Giants used a four-run eighth inning to pull away for an 8-3 victory over the visiting Colorado Rockies in the finale of a three-game series on Thursday afternoon. Mike Yastrzemski came off the bench to drive in two runs, one on his 21st homer of the season, as the Giants gave outgoing manager Bruce Bochy a 2,003rd career win with just three games remaining. Bochy, whose record in 13 seasons with the Giants is 1,052-1,051, will wrap up his 25-year career against the rival Los Angeles Dodgers on Friday, Saturday and Sunday.