Koehler said he went into the game mindful of the need to pitch inside against the Nationals.
"Guys tend to get a little upset when they get crowded," Koehler said. "They had been attacking fastballs over the plate. It's our job as starters to make sure they know that's our part of the plate. We've been beaten inside too many times late in the game in the last couple of series because we haven't established inside."