"It makes it little hard on the opposing manager to put Dominguez in between them," Porter said. "It gives good continuity to the lineup. Having George behind [Jose] Altuve, we've spoke about the whole dynamic many times before and I like having those guys back to back."
Singleton was hitting cleanup for the fifth time since joining the Astros.
"Anywhere in the lineup, I feel comfortable, whether it's leadoff or in the nine-hole," he said. "It's not going to [deter] me from my game plan or anything like that."
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.