With Robbie Grossman sent to the minors, Brandon Barnes got the start in center field and led off Tuesday, going hitless in four trips. His performance over the next month, manager Bo Porter said, will go a long way toward helping to decide the Astros’ outfield plans for this season. “I’m going to run him out there against righties and lefties and give him an opportunity to answer questions,” Porter said. “We know what we have defensively. The only question is can he handle right-on-right pitching on a consistent basis.” Porter said he assured Grossman that his trip to Oklahoma City was in large part dictated by the need for [...]