Included in the rally was a four-game sweep of Albuquerque at the Brick.
On Monday, Brad Snyder, who also spent time this season with Houston, accounted for the only RBI. He drove in J.B. Shuck with a double in the sixth inning. Snyder finished with three of the RedHawks' seven hits.
Keuchel, Sergio Perez, Aneury Rodriguez and Chuckie Fick combined to blank the Express (69-75) on three hits, two walks and three strikeouts.
The Astros website said Monday that three more minor league players are expected to join the National League team in the next few days. Hawks catcher Carlos Corporan is expected to rejoin Houston. Oklahoma City closer Jose Valdez, who finished third in the PCL with 21 saves, is another candidate to join the Astros.
Oklahoma City begins the 2013 season April 4 at Memphis. The Hawks' home opener is scheduled April 12 against the Redbirds.