I don't see the Rangers sweeping the Rockies at Coors Field. That could happen, though, if Colorado starter Jon Gray doesn't pitch better. 
If there's one area Gray does well, though, is beat American League teams at home. He is 4-0 with a 1.85 ERA in six career interleague starts at Coors. American League batters are hitting only .159 against him at Coors. 
Youngster Kolby Allard goes for the Rangers. He's never pitched at Coors Field. 

The Rockies have been held in check for two games now scoring six runs against the Rangers. Their bats have yet to be held in check for three straight games all season. Colorado ranks first in batting average and has scored the third most runs in the majors.