Dominguez, the starter at third, was removed in the ninth inning for pinch-runner Marwin Gonzalez, a shortstop. Ronny Cedeno started the game at shortstop but was pinch-hit for in the ninth. Paredes, who started in right and can play third, was taken out for defensive purposes in the seventh. Next man up was Corporan.
"That's why Corporan takes grounders at third every day," Astros manager Bo Porter said. "He can pick 'em, though. He has enough arm strength, and if he had to go over there, he was prepared to do it."
Corporan reminded a reporter Saturday he was actually drafted as a first baseman and also played some third before being moved to catcher during his first pro season in 2003, but he's never appeared at third in a game in the pros. He does have a first baseman's mitt and an infielder's glove in his locker.
"I have a long way to go, but as an emergency, I think I'm pretty good for a couple of innings," he said.
Astros second baseman Jose Atluve was asked if he was ready to see Corporan at third.
"No!" he joked.
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. Chris Abshire is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.