2005 The Nationals, formerly known as the Expos, lose their inaugural season opener, bowing to the Phillies, 8-4. The franchise, which played its initial 36 years in Montreal, becomes the first team to represent the nation’s capital since the Senators left Washington to become the Texas Rangers in 1971.

On April 5, 2005 —  2005 The Nationals, formerly known as the Expos, lose their inaugural season opener, bowing to the Phillies, 8-4. The franchise, which played its initial 36 years in Montreal, becomes the first team to represent the nation’s capital since the Senators left Washington to become the Texas Rangers in 1971.

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Sources:
Baseball Reference April 5
National Pastime April 5
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game