Opening Day at Nationals Park
U. S. Secret Service snipers stand watch, due to the participation of President Barack Obama
Arriving fans go through Secret Service screening, due to the participation of President Barack Obama
The Phillies roster
The Phillies warm up in left field during batting practice
President Barack Obama greets wounded members of the U.S. armed forces
The game marked the 100th anniversary of the first ceremonial first pitch, first performed by President William Taft in 1910
President Barack Obama throws the ceremonial first pitch
Nationals third baseman Ryan Zimmerman receives the 2009 Silver Slugger Award
Wounded members of the U.S. armed forces stand at attention to greet President Barack Obama
President Barack Obama greets the crowd
President Barack Obama throws the ceremonial first pitch to Nationals third baseman Ryan Zimmerman
President Barack Obama greets the umpires
Nationals third baseman Ryan Zimmerman receives the 2009 Rawlings Gold Glove Award
President Barack Obama leaves the field with Nationals third baseman Ryan Zimmerman
President Barack Obama greets children of deployed U.S. soldiers
Columnist George Will and his son Jon deliver the opening lineup
The Nationals' starting players take the field to fireworks
Caressa Cameron (Miss America 2010, Miss Virginia 2009, and 2009 Nat Pack member) makes the honorary "Play Ball" call
First pitch
The Alexandria Water Taxi prepares to depart
