The Nationals have sent pitcher John Lannan to Double-A Harrisburg. Lannan was Washington's Opening Day starter. He was 2-5 with a 5.76 ERA in 14 starts. "I think he was starting to press," Nationals general manager Mike Rizzo said. "I think his struggles were getting the best of him. Psychologically, I think he was very worried he was letting his team down, that he wasn't giving his teammates a chance to win games."