WASHINGTON — Set aside the high-pressure task of postseason pitching that Chris Carpenter routinely masters for the St. Louis Cardinals and think about this:

Even the take-it-for-granted act of breathing feels odd on occasion now that he's missing a rib and two neck muscles.

Taking the mound for only the fourth time in 2012 after complicated surgery to cure numbness on his right side, the 37-year-old Carpenter spoiled the return of postseason baseball to Washington by throwing scoreless ball into the sixth inning, and the defending champion Cardinals beat the Nationals 8-0 Wednesday to take a 2-1 lead in their NL division series.

"To go from not being able to compete, and not only compete but help your team, to be able to be in this situation," Carpenter said, "it's pretty cool."

Rookie Pete Kozma delivered a three-run homer, and a trio of relievers finished the shutout for the Cardinals, who can end the best-of-five series in Thursday's Game 4 at Washington. Kyle Lohse will start for St. Louis. Ross Detwiler pitches for Washington, which is sticking to its long-stated plan of keeping Stephen Strasburg on the sideline the rest of the way.

"We're not out of this, by a long shot," Nationals manager Davey Johnson said. "Shoot, I've had my back to worse walls than this."

With the exception of Ian Desmond – 3 for 4 on Wednesday, 7 for 12 in the series – the Nationals' hitters are struggling mightily. They've scored a total of seven runs in the playoffs and went 0 for 8 with runners in scoring position and left 11 men on base in Game 3.

Rookie phenom Bryce Harper's woes, in particular, stand out: He went 0 for 5, dropping to 1 for 15. He went to the plate with an ash bat and no gloves in the first inning, tried wearing anti-glare tinted contact lenses on a sun-splashed afternoon – nothing helped.

"Nothing I can do," the 19-year-old Harper said. "I just missed a couple."

All in all, quite a damper on the day for a Nationals Park-record 45,017 red-wearing, towel-twirling fans witnessing the first major league postseason game in the nation's capital in 79 years. They didn't have much to enjoy, in part because of the problems created by Nationals starter Edwin Jackson, who was on the Cardinals' championship team a year ago.

"I didn't feel like I was out of rhythm. I didn't feel like I couldn't throw strikes. I just missed across the plate with a couple of balls and it cost me," Jackson said.

He gave up four consecutive hits in the second, the biggest being Kozma's first-pitch homer into the first row in left off a 94 mph fastball to make it 4-0. Kozma took over as the Cardinals' everyday shortstop in September, replacing injured All-Star Rafael Furcal, and only had 72 at-bats during the regular season.

But he's only the latest in a series of "Who's that?" stars of this postseason.

With the Capitol Dome rising beyond left field, the crowd of today was ready to root, root, root for the home team, breaking into chants of "Let's go, Nats!" after player introductions and again after a four-jet flyover. And, boy, did they boo – when Cardinals outfielder Jon Jay was announced as the game's first batter, when first-base umpire Jim Joyce missed a call, when catcher Yadier Molina trotted to chat with Carpenter, even when Carpenter paused between pitches to tie his red-and-gray right shoe.

"Carp's been a dominant pitcher his whole career. Big-game pitcher. He showed up," Washington's Jayson Werth said. "He pitched well today. We had him in some spots. We had him on the ropes a couple of times. We were just one bloop away from a totally different ballgame."

The Cardinals won 10 fewer games than the majors-best Nationals this season and finished second in the NL Central, nine games behind Cincinnati, sneaking into the postseason as the league's second wild-card under this year's new format. But the Cardinals become a different bunch in the high-pressure playoffs – no matter that slugger Albert Pujols and manager Tony La Russa are no longer around.

Carpenter still is, even though even he didn't expect to be pitching this year when he encountered problems during spring training and needed what Cardinals manager Mike Matheny termed a "radical" operation in July to correct a nerve problem.

"Everyone had written him off, kind of," Jay said. "It could have been a season-ending injury, where he could have just gone home and said, `See you later.'"

The top rib on Carpenter's right side was removed, along with muscles that were constricting blood flow up there. After Wednesday's game, he squeezed his big right hand with his left, explaining, "Basically, my nerves were getting squished down by all the scar tissue and all the muscles and everything. There wasn't enough space."

Still adjusting to the way breathing feels different, he returned Sept. 21, going 0-2 in three starts totaling 17 innings, so it wasn't clear how he'd fare Wednesday.

Yeah, right.

Carpenter allowed seven hits and walked two across his 5 2-3 innings to improve to 10-2 over his career in the postseason. That includes a 4-0 mark while helping another group of wild-card Cardinals take the title in the 2011 World Series, when he won Game 7 against Texas.

The 10 victories tie Carpenter for seventh-most, behind Andy Pettitte's record 19.

"If the baseball world doesn't know what an amazing competitor he is by now, they haven't been paying any attention," Cardinals left fielder Matt Holliday said.

Carpenter collected a pair of hits, including a double off the wall in the fifth that was about a foot or two away from being a homer. When he reached second base, he raised his right fist.

Earlier, Carpenter stepped to the plate for his first at-bat and chatted with umpire Joe West.

"I say hello to him. And he said hello back, and he talked about what a beautiful day it was to play a baseball game. And I was like, `You ain't kidding,'" Carpenter recounted. "Beautiful weather. The crowd is going crazy. ... There's no question you take time to reflect on that."

NOTES: Holliday fouled a ball off his left leg in the eighth, stayed in to deliver a two-run single, then left for a pinch runner. ... Lohse beat the Braves in the wild-card game. ... Detwiler will be making the first postseason appearance of his career. His last regular-season start also came against the Cardinals, and he went only 2 1-3 innings, giving up seven runs. ... Wednesday was the 88th anniversary of Washington's only World Series championship, won by the Senators on Oct. 10, 1924.

___

Follow Howard Fendrich on Twitter at http://twitter.com/HowardFendrich

Loading Slideshow...
  • Pete Kozma

    St. Louis Cardinals' Pete Kozma hits a three-run home run in the second inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington. Watching behind the plate are home plate umpire Joe West and Nationals catcher Kurt Suzuki.

  • Pete Kozma, David Freese, Daniel Descalso

    St. Louis Cardinals' Pete Kozma, right, high-fives teammates David Freese and Daniel Descalso after batting them with on a three-run home run in the second inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington.

  • Pete Kozma, Jon Jay

    St. Louis Cardinals' Pete Kozma, left, is congratulated by Jon Jay after hitting a three-run home run in the second inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington.

  • Pete Kozma

    St. Louis Cardinals' Pete Kozma watches his three-run home run as he runs down the first base line in the second inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington. Daniel Descalso and David Freese scored on the play.

  • David Freese

    St. Louis Cardinals third baseman David Freese fields a ground ball that was hit by Washington Nationals' Danny Espinosa in the second inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington. Espinosa was thrown out at first.

  • Washington Nationals

    A fan waves a towel in the stands during Game 3 of the National League division baseball series between the Washington Nationals and the St. Louis Cardinals on Wednesday, Oct. 10, 2012, in Washington.

  • Carlos Beltran

    St. Louis Cardinals right fielder Carlos Beltran catches a fly ball that was hit by Washington Nationals' Jayson Werth in the third inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Edwin Jackson

    Washington Nationals starting pitcher Edwin Jackson throws to the St. Louis Cardinals in the fourth inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Bryce Harper

    Washington Nationals' Bryce Harper wears colored contacts as he looks on from the dugout in the third inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Chris Carpenter

    St. Louis Cardinals starting pitcher Chris Carpenter reacts after hitting a double in the fifth inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington.

  • Dusty Baker, Ryan Hanigan

    Cincinnati Reds manager Dusty Baker, right, talks with catcher Ryan Hanigan during batting practice prior to Game 4 of the National League division baseball series against the San Francisco Giants, Wednesday, Oct. 10, 2012, in Cincinnati.

  • Danny Espinosa

    Washington Nationals' Danny Espinosa bunts in the second inning of Game 3 of the National League division baseball series against the St. Louis Cardinals on Wednesday, Oct. 10, 2012, in Washington. Espinosa was called out at first.

  • Daniel Descalso

    St. Louis Cardinals' Daniel Descalso hits a sacrifice fly ball in the sixth inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington. Yadier Molina scored on the play.

  • Chris Carpenter

    St. Louis Cardinals starting pitcher Chris Carpenter throws to the Washington Nationals in the fourth inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Joe Nuxhall

    The sun shines on a statue of former Cincinnati Reds pitcher Joe Nuxhall outside Great American Ballpark prior to Game 4 of the National League division baseball series against the San Francisco Giants, Wednesday, Oct. 10, 2012, in Cincinnati.

  • Jayson Werth, Bryce Harper

    Washington Nationals center fielder Bryce Harper, right, chases after a double hit by St. Louis Cardinals' David Freese that right fielder Jayson Werth, left, was unable to catch at the wall in the sixth inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Daniel Descalso

    St. Louis Cardinals' Daniel Descalso hits a sacrifice fly ball in the sixth inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington. Yadier Molina scored on the play.

  • Chris Carpenter

    St. Louis Cardinals starting pitcher Chris Carpenter, left, is greeted by third base coach Jose Oquendo and teammates in the dugout after being relieved in the sixth inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington.

  • Chris Carpenter

    St. Louis Cardinals starting pitcher Chris Carpenter throws to the Washington Nationals in the sixth inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Yadier Molina

    St. Louis Cardinals' Yadier Molina, left, scores a run on a sacrifice fly by Daniel Descalso in the sixth inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington.

  • Jayson Werth, Bryce Harper

    Washington Nationals right fielder Jayson Werth, right, is unable to catch a double hit by St. Louis Cardinals' David Freese as center fielder Bryce Harper, left, looks on in the sixth inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Edwin Jackson

    Washington Nationals starting pitcher Edwin Jackson looks on from the dugout in the fifth inning of Game 3 of the National League division baseball series against the St. Louis Cardinals on Wednesday, Oct. 10, 2012, in Washington.

  • Jon Jay

    St. Louis Cardinals' Jon Jay high-fives coaches and teammates in the dugout after scoring a run on a bases-loaded walk to Yadier Molina in the seventh inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington.

  • Trevor Rosenthal, Bryce Harper

    St. Louis Cardinals relief pitcher Trevor Rosenthal, right, beats Washington Nationals' Bryce Harper to first base for an out in the seventh inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Trevor Rosenthal

    St. Louis Cardinals relief pitcher Trevor Rosenthal throws to the Washington Nationals in the seventh inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Carlos Beltran, Kurt Suzuki

    St. Louis Cardinals' Carlos Beltran, left, slides into home plate past Washington Nationals catcher Kurt Suzuki for a run on a single by Matt Holliday in the eighth inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.

  • Matt Holliday

    St. Louis Cardinals' Matt Holliday singles in the eighth inning of Game 3 of the National League division baseball series against the Washington Nationals on Wednesday, Oct. 10, 2012, in Washington. Carlos Beltran and Jon Jay scored on the play.

  • Ryan Zimmerman

    Washington Nationals' Ryan Zimmerman walks off the field after striking out swinging in the seventh inning of Game 3 of the National League division baseball series against the St. Louis Cardinals on Wednesday, Oct. 10, 2012, in Washington.

  • Christian Garcia

    Washington Nationals relief pitcher Christian Garcia pauses after walking St. Louis Cardinals' Yadier Molina with the bases were loaded in the seventh inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington. The Cardinals' Jon Jay scored on the play.

  • Kurt Suzuki, Carlos Beltran

    St. Louis Cardinals' Carlos Beltran, left, slides into home plate past Washington Nationals catcher Kurt Suzuki for a run on a single by Matt Holliday in the eighth inning of Game 3 of the National League division baseball series on Wednesday, Oct. 10, 2012, in Washington.