Jayson Werth, who was scheduled to start the game in right field, was a late scratch because of a severe migraine headache, which he suffered after he arrived at the ballpark. He was better by the seventh inning and could have entered the game as a pinch-hitter, but manager Davey Johnson didn't want to take any chances.
"When I got here, I didn't feel so hot," Werth said. "I pulled it together by the seventh inning. I dressed, came out in case they needed me. I still didn't feel very good. But during an emergency, I think I could have been used."
Werth has struggled in his last nine games, going 4-for-30 (.133), while Moore, who is ranked No. 14 on MLB.com's list of Top 20 Nationals prospects, was hitting .286 with seven home runs and 20 RBIs for Triple-A Syracuse.
With Moore, who went 1-for-3, in the lineup, Bryce Harper was moved from left to center field, and Xavier Nady started in right.