Baker hit a two-run home run, Holliday had a solo shot and Stewart finished with three RBI, helping the Rockies sweep a four-game series.

Starter Aaron Cook (12-6) pitched seven innings, holding the Pirates to five hits and three runs.

Adam LaRoche and Nate McLouth each drove in a run for Pittsburgh, which has lost seven of its last nine games.

Zach Duke (4-7), battered for nine runs and 10 hits over five innings, was the losing pitcher.