From the Nationals:
"President of the United States Barack Obama will throw the ceremonial first pitch at Nationals Park
in Washington D.C. prior to the 2010 season opener between the Washington Nationals and the defending National League Champion Philadelphia Phillies on Monday, April 5 at 1:05 p.m.
"'Opening Day of the baseball season is a special event for our country and its importance has been reinforced by the 100-year history of Presidential participation,' said Baseball Commissioner Allan H. (Bud) Selig, who will be in attendance for the historic First Pitch. 'I am proud that President Obama will continue the long Presidential tradition of throwing out the first pitch of Opening Day in Washington D.C.'
"Obama's appearance will mark the 100th anniversary of the first time a U.S. President threw an Opening Day first pitch and the 48th time a President has done so in Washington, D.C. On April 14, 1910, William Howard Taft began the tradition before the Washington Senators went on to defeat the Philadelphia Athletics 3-0 behind a one-hit, complete game shutout by Hall of Fame pitcher Walter Johnson."
The game is already sold out, but there will be 400 day-of-game seats available for $5 starting at 10 am at the box office.