Updated

Carlos Beltrán is helping to make the St. Louis Cardinals’ hunt for a red October a reality.

And coupled with an unheralded bullpen, Beltrán and the Cardinals aren’t holding back.

A combined six relievers delivered 5 1-3 scoreless innings of relief to lead the reigning World Series champions to a 6-4 victory over the San Francisco Giants in Game 1 of the NL championship series Sunday night.

"We feel like we're an asset. We don't get talked about much, and I guess that's a good thing," said right-hander Mitchell Boggs, who pitched the eighth. "We don't have big name guys. Tonight was a good night for us."

Beltrán, and fellow slugger David Freese, did their part with two-run homers as the Cardinals built an early 6-0 cushion and held on. Only two nights earlier, the Cardinals came back from the same deficit, using a four-run rally in the ninth inning at Washington in the deciding Game 5 of the division series.

"I'm thinking about the D.C. game," Freese said. "They were up 6-0. We were up 6-0. And that shows that you've got to keep playing. ... We were fortunate enough that our bullpen came in and closed the door the rest of the way."

Game 2 in the best-of-seven series is Monday night. Chris Carpenter pitches for the Cardinals against Ryan Vogelsong.

This is the first time the previous two World Series winners are facing off in the postseason since the 1958 World Series between the Braves and Yankees.

Beltrán's fourth-inning drive into the seats in left-center chased San Francisco starter Madison Bumgarner, who has been a far cry from the impressive pitcher he was during the 2010 World Series run.

It was Beltrán's 14th career postseason home run and third this October.

"Right now I'm really enjoying myself," Beltrán said. "Right now I'm seeing the ball well. I feel like I have a good approach at the plate, I feel like I'm not trying to do too much, and good things are happening."

Beltrán spent the second half of the 2011 season with San Francisco after a trade from the Mets, but the Giants missed the playoffs last fall a year after the capturing an improbable championship the previous season. The orange towel-waving sellout crowd of 42,534 booed him at every opportunity — during pregame introductions and each time he stepped into the batter's box.

Both teams were well rested a day after a rough night of travel. The Giants barely beat the Cardinals to the Bay Area early Saturday after they were delayed three hours on the tarmac in Cincinnati on Friday night — to refuel and for a mechanical problem after waiting out the Cardinals-Nationals game to know where they were headed next.

Matheny stuck with the same lineup that he sent out for Game 5, and some of the same faces came through again.

"They put together some better at-bats than us," Giants center fielder Angel Pagan said. "They hit some homers and were up 6-0. That's a pretty good lead in the playoffs. We tried to battle back. We did our best but it wasn't our night."

Daniel Descalso, who hit a tying, two-out single in Friday's 9-7 win, added two more hits.

Descalso hit a one-out double in the fourth, then rookie Pete Kozma drove him home with a double of his own. In the ninth inning Friday, Kozma followed Descalso with a go-ahead, two-run single.

Descalso, who spends the offseason in San Francisco's Marina district, did well playing in his native Northern California.

But he was quick to praise all the pitchers out of the pen.

"The last two games they've been huge for us, coming in early, a lot earlier than we anticipated," Descalso said. "They've been outstanding."

St. Louis 18-game winner Lynn didn't allow a hit until Marco Scutaro's single to left leading off the fourth. Hunter Pence singled two outs later and Brandon Belt drove him home with a single. Gregor Blanco followed with a two-run triple, then Brandon Crawford hit an RBI double. Pinch hitter Aubrey Huff — a 2010 postseason star now in a diminished role — drew a walk to cheers of "Aubrey! Aubrey!"

And, just like that, Lynn was done.

"The bullpen did a great job," catcher Yadier Molina said. "We struck first, and to hold that lead, we won with the bullpen."

Bumgarner and Lynn each lasted only 3 2-3 innings. That made for a long night in both pens.

Beltrán and Freese each got Bumgarner with two strikes.

"I think that's been very much of a strong suit for us all season," Matheny said. "And it's a beautiful thing when these guys trust themselves when they get to two strikes. They can be a little more selective early in the count and then they're not going to panic when we do get to two strikes. I give the guys a lot of credit."

The pressure is now on for the Giants not to fall behind 2-0 at home again. They lost the first two games of their division series here to the Reds last weekend before winning three in a row at Cincinnati. They went 48-33 at AT&T Park this season.

"We've shown how resilient we can be," manager Bruce Bochy said. "We hate to lose them at home, but it happens. And we've got to wash this one off and come out and be ready to go tomorrow."

Bumgarner, a 16-game winner for the NL West champs, lost Game 2 of the division series at home to the Reds exactly a week earlier.

He pitched a 1-2-3 first on Sunday but ran into trouble in the second when Molina singled on an 0-2 pitch with one out. Freese then drove a 3-2 pitch over the wall in left-center to give the Cardinals a 2-0 lead.

Bumgarner needed 30 pitches to get through the second, and now has an 11.25 ERA in his two postseason starts this year.

Lynn returned to the rotation for the NLCS and his first career postseason start after making four relief appearances in the division series. Matheny needed another starter after left-hander Jaime Garcia injured his left shoulder in Game 2 against the Nationals.

"Right now we feel like everyone's feeding off each other," reliever Joe Kelly said. "If one guy does something, you want to go out and match it and try to keep that momentum going. It shows the confidence that Mike has in this bullpen. It makes us want to play better for him. He hands the ball off and he knows what he's doing."

Based on reporting by the Associated Press.

Follow us on twitter.com/foxnewslatino
Like us at facebook.com/foxnewslatino