Brandon Crawford drove in three runs and the San Francisco Giants stretched their winning streak to eight games with a 10-8 win over the skidding Colorado Rockies in the opener of a day-night doubleheader Saturday at rain-soaked Coors Field. More rain was in the forecast for the second game when the Giants sought their first nine-game winning streak since winning 10 in a row in May 2004. The Rockies lost for the 17th time in 21 games.