Dubin will start Sunday against the Mets in what's expected to be a bullpen day for the Astros, Brian McTaggart of MLB.com reports.
Dubin hasn't covered more than three innings in any of his appearances in the majors and minors this season, so that likely represents the upper bound of his workload as he takes the hill for what will be his second MLB career start. The Astros don't have an obvious candidate to work in bulk relief behind Dubin, but the team could call up a pitcher from Triple-A Sugar Land ahead of Sunday's contest to provide the bullpen with another fresh arm.