I hate to say it Greg, but my guess is the Red Sox in five.
The Sox lineup, with the exception of Lugo, are amazing hitters with great patience at the plate. And the Rockies pitching staff while good, don't seem good enough to hold 'em. There be no Koufaxs or Gibsons or even any Shillings on that roster o' theirs, ya know.
(the only chance the Rockies have is if Manny drops a few more fly balls out there in left field than he usually does)