Lopes will also be reunited with Jayson Werth, who credits Lopes with his success during the outfielder's four years in Philadelphia.
"Davey Lopes wasn't a hitting coach, but he is a baseball coach," Werth said in 2011. "He was really good [when it came to] my overall mentality toward the game and how to play the game. He was very instrumental and kind of molded me into the player I became [with the Phillies].
"Out of anybody, I would say Davey Lopes was probably the best coach I ever had. He is awesome."
With Lopes, the Nationals will get a new voice when it comes to running the bases and playing the outfield.