It was believed that Detwiler hurt his back while catching a wide throw from shortstop Ian Desmond in the bottom of the third, but Detwiler said he felt fine.
Detwiler had problems throwing pitches after that, and pitching coach Steve McCatty, head athletic trainer Lee Kuntz and manager Davey Johnson came to his aid. Detwiler stayed in and allowed a single to A.J. Ellis and walked Ethier to load the bases. Detwiler got out of the inning when Scott Van Slyke lined out to third baseman Ryan Zimmerman. Detwiler was then replaced by Craig Stammen, who pitched three shutout innings and struck out three batters.
It's not known if Detwiler will make his next start in San Francisco next week.
"It's not all that great now. Hopefully, tomorrow morning it will feel a lot better," Detwiler said.
An inning later, catcher Wilson Ramos re-injured his left hamstring, the same injury that put him on the disabled list last month. Ramos hit a two-out single to left field and ran gingerly to first. Once he reached the bag, he slammed his helmet to the ground and was replaced by Kurt Suzuki. Ramos felt something was wrong when he doubled in the second inning. Manager Davey Johnson believes Ramos will go on the DL.
"I'm not too hurt, but I talked to Lee and told him that I don't want to be hurt again, so they took me out of the game. I don't want to be on the DL again," Ramos said. "But it's a little bit sore. ... I was working hard with my hamstring and trying to get my hamstring stronger. But I don't know what happened today. I was feeling good before I felt it today."
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.