Tuesday night, Walters connected on a leadoff home run to right in the ninth on the first pitch from lefty Dan Jennings for his first big league dinger.
"It was great," said Walters, who entered as a defensive replacement in the sixth. "I asked Matt [Williams] if I could swing, didn't know if I was taking a strike, but got a fastball looking forward and just made good contact."
The Nationals acquired Walters, their No. 6 prospect according to MLB.com, in a 2011 trade with the Diamondbacks for right-hander Jason Marquis. Walters is now 4-for-11 (.364) with three runs, a homer and two RBIs in 10 Major League games.
Walters, who said his name has been spelled wrong for previous milestone balls, would probably use this one as a desk piece.
"The whole thing's a dream, honestly, just being here," Walter said. "My dream is to win the World Series. Hopefully I can talk to you about that later. … I don't remember any of it. I blacked out. They hit me on top of the head, just slapping hands. Before I know it I'm sitting on the other side of the bench."
Christina De Nicola is a contributor to MLB.com. Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.