Rangers have the lowest team ERA in MLB

And the Astros have the 5th lowest (according to teamrankings.com). Rangers have the lowest runs allowed in MLB and the Astros have the second lowest (according to teamrankings.com).

Are the Rangers in position to put some offense together and make a run for the division through the remainder of the season? Or do you see either Seattle or the Mariners as the team to battle the Astros for the division toward the end of the season?