Byrd's demotion came just before Washington's game at Florida. Byrd, 27 -- who recently won an appeal of a two-game suspension for his aggressive action following his ejection in a game June 4 against Florida -- was batting .248 with 16 RBI in 56 games with the Nationals and Philadelphia this season.
He became expendable when the Nationals acquired Preston Wilson in a trade with Colorado.
Byrd was acquired by Washington in a trade with the Phillies earlier this season, is in his fourth major league season. He is a .267 lifetime with 13 home runs and 95 RBI.