WASHINGTON -- The Pirates' injury woes continued Saturday, when shortstop Ronny Cedeno was placed on the seven-day disabled list with a concussion.

Cedeno was hit in the back of the head attempting to break up a double play in the fourth inning of Friday's game in Washington. He experienced limited symptoms initially and remained in the game, but got progressively worse after leaving the ballpark.

Cedeno hit .252 and scored 30 runs with 23 RBIs through the first half of the season. Chase d'Arnaud took his spot at shortstop in Game 1 of Saturday's doubleheader and Brandon Wood got the start at third base.

Pittsburgh recalled infielder Pedro Ciriaco from Triple-A Indianapolis to take Cedeno's spot on the 25-man roster. The 25-year-old Ciriaco played in 40 games for Indianapolis, where he hit .210 with 15 RBIs and 10 stolen bases.

He appeared in eight games last season for Pittsburgh and had three hits in six at-bats.

Lincoln called up for nightcap; Wood optioned

WASHINGTON -- After winning the first game of Saturday's doubleheader with the Nationals, the Pirates recalled right-hander Brad Lincoln from Triple-A Indianapolis to start the nightcap.

Lincoln made nine starts last year for Pittsburgh, but he is likely only up for the doubleheader. The right-hander has gone 6-7 with a 4.14 ERA in Indianapolis.

"He's going to get an opportunity to pitch a big league game," said manager Clint Hurdle. "He's gone down and worked extremely hard. He's had some very good periods and stretches of pitching. The overall volume of things is in a pretty good place. He's made some adjustments, moved forward and has three pitches in play. This is an opportunity for us to get a look at him."

The Pirates optioned reliever Tim Wood to Indianapolis to make room for Lincoln on the active roster. Wood took the loss in Friday's 2-1 game after allowing a walk-off single to pinch-hitter Matt Stairs.

The move could leave the Pirates' bullpen shorthanded, but Game 1 starter James McDonald pitched into the seventh inning. Hurdle only used Jose Veras and Joel Hanrahan after needing five relievers in Friday's loss.

McDonald's performance certainly helped, but the Bucs play day games Sunday in Washington, then Monday at home against Houston. Their next day off is Thursday.

"We'll have to pay attention moving forward," Hurdle said. "I don't like guys throwing more than three days in a row, and there are two games today to try to get through.

"You just try to use common sense and be smart ... and we'll see where it leads us. There are always options we can put in play to adjust accordingly if something happens the way we don't want it to happen in the first game."

McKenry making most of chance with Bucs

WASHINGTON -- While the Pirates' starters were consistent throughout the first half of the season, the man behind the plate was not.

Seven players have caught a game for Pittsburgh this season. But with Chris Snyder and Ryan Doumit on the disabled list, Michael McKenry has received the bulk of the work since his June 12 acquisition from Boston.

The results on the mound were more of the same.

Pirates starters have a 3.79 ERA in the 13 games McKenry has started. They have a 2.68 ERA over the past seven games, five of which saw McKenry behind the dish.

"He deserves a lot of credit," said manager Clint Hurdle. "He's absolutely put a foot down back there as far as blocking balls and receiving and calling the game. We haven't had hardly any issues. It's been a seamless transition as far as pitch-calling, following the game plan, receiving, and he's been absolutely dynamite with balls in the dirt."

McKenry allowed his first wild pitch get away from him Friday against the Nationals, but Hurdle estimates there were opportunities for at least 12 others since he joined the team.

Blocking balls in the dirt is nothing new to McKenry. His biggest adjustment came in learning an entirely new staff for the third time this season.

He spent Spring Training with the Rockies after appearing in six games for Colorado last year. Then he spent two days with Triple-A Colorado Springs before the Rockies traded him to Boston, where he had to learn the Triple-A Pawtucket staff.

The Pirates acquired him June 12, and he made his first start the next day. He has been the regular backstop since.

"It's a growing process through the year," McKenry said of handling a new staff. "I keep my mouth shut, for the most part, and my ears open. God gave us two ears and one mouth for a reason. So I keep my mouth shut and let these [pitchers] tell me what they like to do. As we've gone on, I've definitely intermingled a lot more and said what I think."

Walker returns to starting lineup

WASHINGTON -- Manager Clint Hurdle had a full bench at his disposal for Saturday's doubleheader with the return of Neil Walker and Xavier Paul.

Walker got the start at second base in both games of the twin bill, while Paul came off the bench as a defensive replacement in right field in the Game 1 win.

Walker missed the previous two games with a sore back, while Paul experienced right hamstring tightness that kept him out of the previous three games.

"He's pretty much fit for duty," Hurdle said of Paul. "Is he 100 percent? I don't think so, but I think he's able to go out and play."