Galvis pulled to a stop at second as Blanco crossed home plate. He lifted the helmet from his head, looked toward the Phillies' dugout and slammed it into the dirt in a moment of celebration. His teammates mobbed him seconds later.
"I was just waiting to see if Jayson Werth could get to that one," Galvis said. "Thank God he didn't get it."
If only Galvis could face Papelbon more frequently. He is 3-for-3 with one double, one home run, one walk and two RBIs against him since the Phillies traded him to the Nationals last July. Galvis homered against Papelbon on Sept. 14 to give him his first blown save with the Nationals. He singled against Papelbon on Sept. 26 and then walked on four pitches against him on Sept. 27, when Papelbon suffered a five-run meltdown in a game made infamous when he grabbed teammate Bryce Harper by the neck in the dugout.
"I played behind him for three years," Galvis said about Papelbon. "So I know the way he pitches and maybe a little about what the ball does. He's got the split and the fastball. I know he likes to throw the fastball. I think he threw me four, five fastballs so I was ready for it."
Galvis hit a 1-2 fastball to left, giving the Phillies their first hit in the leadoff spot since the first inning Wednesday against San Diego. A one-out double from Peter Bourjos, who scored on Blanco's two-out single to left to tie the game, set up Galvis' dramatic at-bat.
Papelbon made it clear afterward that blowing the game will not ruin him.
"We're in first place and we won the [well-fought] series, man. You know?" he said.
Papelbon is 1-2 with a 12.27 ERA and two blown saves in four appearances against the Phillies since they traded him.
"They're just another team for me," he said. "I'm going out there trying to do the same [things] I am against any other team. Makes no difference to me."
The game made a difference for Galvis. It was the third walkoff hit of his career. He had another memorable one May 19, 2013, when he homered against Reds closer Aroldis Chapman.
"I just try to get focused a little bit more," Galvis said about facing closers. "I know the situation. I just want to concentrate and try to put the ball in play. I had a lot of fastballs to hit today. He threw me fastballs and I put a good swing on that one."
Galvis is hitting .222 (10-for-45) with two doubles, one home run, four RBIs and a .583 OPS in 13 games this season. He is 4-for-12 in his last three games.
"I think it's something to maybe get me going," he said.
Todd Zolecki is a reporter for MLB.com. Read his Phillies blog The Zo Zone, follow him on Twitter and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.