KANSAS CITY, Mo. — The Kansas City Royals have embraced the bloop, bunt and sacrifice fly all postseason.

Add in more sparkling defense and that dominant bullpen, and the wild-card Royals are suddenly one win from the World Series.

Billy Butler drove in the go-ahead run with a sacrifice fly in the sixth inning, and the Royals’ steel-curtain bullpen shut down the Baltimore Orioles the rest of the way for a 2-1 win Tuesday night and a commanding 3-0 lead in the AL Championship Series.

Third baseman Mike Moustakas made two marvelous plays as the picture-perfect Royals won their 10th straight postseason game, including all seven this year. Making its first playoff appearance in 29 years, the only thing that’s slowed Kansas City so far was a rainout Monday.

Kansas City will send Jason Vargas to the mound for Game 4 on Wednesday, trying to advance to its first World Series since 1985. Miguel Gonzalez will try to help the Orioles stave off elimination.

The Royals’ Jeremy Guthrie and Orioles’ Wei-Yin Chen hooked up in a tense pitching duel for five innings.

Chen gave up a leadoff single to Nori Aoki in the sixth. Eric Hosmer followed with a one-out single to put runners on the corners, and Orioles manager Buck Showalter brought in hard-throwing reliever Kevin Gausman to face Butler.

The Royals’ designated hitter sent a fly ball to left field for the tiebreaking run — just the latest example of Kansas City doing the little things right.

One of the best bullpens in baseball took care of the rest — the relievers combined with Guthrie to retire Baltimore’s final 16 batters.

After winning pitcher Jason Frasor breezed through the sixth, Kelvin Herrera and Wade Davis nailed down the next two innings. All-Star closer Greg Holland worked a perfect ninth for his third save of the series, setting off a wild celebration in the stands.

It was the 13th game to be decided by one run this postseason, matching the record set in 2011 and tied last year. Six games have gone to extra innings, including the Giants’ 5-4, 10-inning victory over the Cardinals hours earlier in the NLCS.

After failing to take the lead in the first two games of the series, Baltimore managed to strike first, temporarily silencing a frigid, flag-waving capacity crowd.

It happened in the second inning, when Steve Pearce and J.J. Hardy connected off Guthrie with back-to-back doubles for a 1-0 lead. Ryan Flaherty later drew a walk, but Guthrie retired Nick Hundley and Jonathan Schoop to escape his biggest jam of the night.

Guthrie wound up grinding through five innings against his former team, allowing just one more hit in his first start since Sept. 26 — a span of nearly three weeks.

Chen matched him pitch-for-pitch until the fourth, when the Royals put together one of their quintessential innings: a pair of bloop singles by Lorenzo Cain and Hosmer, a walk by Butler, and an RBI groundout by Alex Gordon that tied the game.

The Royals played catch up with their gloves, too.

Moustakas made a diving grab to rob Pearce of a single in the fourth.

Then in the sixth, Moustakas tracked a popup by Adam Jones into foul territory, steadied himself at a railing near the dugout, then extended himself to catch the ball and tumbled into the stands.

The blue-clad crowd rose to its feet to give Moustakas a rousing cheer, and many fans were still standing when Butler drove in the go-ahead run in the bottom half of the inning.

By the time the Royals’ “Big Three” of Herrera, Davis and Holland had closed it out, the small-market and perennially downtrodden Royals were on the verge of another postseason sweep.

STATS AND STREAKS

Orioles DH Nelson Cruz had his streak of six straight multihit playoff games end. He was 0 for 4. … Pearce had been 0 for 9 in the series before his double in the second inning.

UP NEXT

Orioles: Gonzalez has not started since his final regular-season outing on Sept. 28. “I’m going to try as best as possible to give our team a chance,” he said.

Royals: Vargas has also had a long stretch without a start, last taking the hill against the Angels in Game 1 of AL Division Series on Oct. 2. “I’ll be ready to go,” he said.