Dubin was optioned to Triple-A Sugar Land on Friday, Chandler Rome of The Athletic reports.
Less than 24 hours after collecting his first career big-league save in a three-inning appearance, Dubin was sent down to Triple-A. In a corresponding move, Parker Mushinski was called up. Through 13.2 innings with the Astros, Dubin has logged a 6.59 ERA with a 13:7 K:BB.