The occasion will mark the second time President Bush has thrown out the ceremonial first pitch at a Nationals game. The first one occurred on April 14, 2005, when Washington played its first game at Robert F. Kennedy Stadium.
"Unless there is a national crisis, he has been warming up since December [to throw the pitch]. He is very excited about it," Nationals principal owner Mark Lerner said.
President Bush has attended four Nationals games, and the team is 2-2 in those games. The last time he was at a Nationals game was July 5, when the Nationals lost to the Cubs, 4-2.
Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.