BALTIMORE -- The Washington Nationals hope to fare better against the Baltimore Orioles when the teams head back to Nationals Park to continue their four-game, home-and-home Beltway Series on Wednesday.

The Orioles took both games at Camden Yards with some timely hitting and effective starting pitching. Baltimore now leads the all-time series 35-23.

"It's a really good team," Orioles manager Buck Showalter said about Washington. "They're one of the best teams in baseball and in that league, so it was tough. We caught a couple young pitchers, but we had a couple young pitchers, too, that did well. Yeah, we'll get on a bus tonight and head over to Washington and play a good team two more times."

Washington will look to right-hander Tanner Roark (13-6) to set the tone. Roark is riding a four-game winning streak and has not lost since July 22 and his 2.87 ERA is the best among all of the Nationals' starters. He has allowed 139 hits with 130 strikeouts and just 51 walks over 163 1/3 innings.

"It's good to be going home. It seems like we haven't been home in a while," Nationals manager Dusty Baker said. "We go home and regroup. Guys get to see their kids and their wives."

Left-hander Wade Miley (7-10, 5.58) is still looking for his first win with the Orioles since being acquired from Seattle at the trade deadline. Miley is 0-2 with a 9.53 ERA with Baltimore in four starts. He was hit especially hard in his last outing Friday and against the Houston Astros. After the Orioles hit four home runs in the first inning to stake him with a 5-1 lead, Miley fell apart. He allowed six runs on six hits over just 1 2/3 innings and did not earn a decision.

"It's embarrassing for that to happen," a disappointed Miley said after the game. "I made a lot of mistakes over the middle of the plate, even after the strikeouts a lot of fastballs trying to get ahead and they were just middle cut and they drove them. That's on me. I've got to set a better tempo than that."

Baltimore got some bad news when Chris Tillman did not have a good work session and he will likely be headed to DL. Tillman had a start last week pushed back three days because of right shoulder discomfort. He was expected to take the mound Thursday in Washington.

"I thought once it got loose it would really go away but it never really did, and that was my first time actually experiencing it while throwing," Tillman said. "Last time, I was pretty sore right after my start, but after feeling it today, I'd much rather just get this behind us and get out in front of it so that way we're not worried about it for the rest of the year."