The Storm Chasers fell to 0-2 on the season, losing 3-1 Friday night in Round Rock.
Max Ramirez singled and later came around to score on a double play to give Omaha a 1-0 lead in the second.
The Express took a 2-1 lead in the fifth. Singles by Joey Butler, Yangervis Solarte and Eli Whiteside produced one run. Solarte scored from third on Engel Beltre’s ground out to first for the second run. Round Rock added its third run courtesy of four walks in the seventh inning.
Justin Grimm (1-0) got the win and Chris Dwyer (0-1) took the loss.