Troy Tulowitzki homered and drove in two runs, leading the Colorado Rockies to a 7-6 victory over a San Francisco Giants split squad Saturday. Tulowitzki homered leading off the second and had a run-scoring fielder's choice in the third. Todd Helton had an RBI double in the four-run third. Buster Posey made his first start at first base and threw out a runner at home on a squeeze play.