© 2012 MLB Advanced Media, L.P. All rights reserved.

04/29/12 9:40 PM ET

Werth scratched late with migraine headache

LOS ANGELES -- About an hour after he arrived at Dodger Stadium, Nationals slugger Tyler Moore found himself in the starting lineup, hitting sixth and playing left field in his Major League debut.

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.

Harper shows off glove in first start in center

LOS ANGELES -- Nationals outfielder Bryce Harper was impressive in his second Major League game, a 2-0 loss to the Dodgers on Sunday afternoon.

Harper went 1-for-3 with a walk, and made a great catch in the fourth inning off the bat of Juan Uribe. On the first pitch from Gio Gonzalez, Uribe swung and hit the ball to deep right-center field. Harper ran back and hit the wall hard after making the catch.

Harper then threw to first to try to double up Andre Ethier, to no avail. But after making the throw, Harper was shaken up and fell down to the ground. He was OK and remained in the game.

"At a zero-zero ballgame, in that situation you want to catch everything," Harper said. "I cramped up after I landed. That was the only thing that bothered me. It's better than running into the walls in Syracuse."

Former Nats closer Cordero eyeing comeback

LOS ANGELES -- Former Nationals closer Chad Cordero was at Saturday's game between the Nationals and Dodgers.

Cordero, who is looking to make a comeback next year, is in great shape after losing 25 pounds by being on Weight Watchers.

Cordero was arguably the first star in Nationals history, saving 47 games with a 1.82 ERA in 2005, the team's inaugural season.

He pitched for Washington until 2008, when a torn labrum in April knocked him out for the rest of the season. After being released by the Nationals at the end of that season, he signed with the Mariners, making nine appearances in 2010, his last big league action.

Cordero is expected to make an appearance at Nationals Park on July 20 and throw out the first pitch before the Nationals play the Braves.

Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.