BALTIMORE -- The Baltimore Orioles have regularly wasted scoring chances in the last few weeks -- a big reason for their sudden slide. But they broke out of that slump in a big way in the eighth inning on Friday night.

Nolan Reimold and Steve Clevenger both hit grand slams, and Manny Machado added a solo shot in a 10-run eighth inning that carried the Baltimore Orioles to a 14-8 victory over the Kansas City Royals.

This is the eighth time in baseball history that a team hit two grand slams in an inning, according to STATS-MLB, which said Baltimore is the lone team to do it twice.

Elias Sports Bureau said the New York Mets were the last team to hit two grand slams in an inning, and that happened against the Chicago Cubs on July 16, 2006. The last time the Orioles came through was when Jim Dwyer and Larry Sheets belted grand slams on Aug. 6, 1986, against the Rangers.

Overall, the Orioles scored 10 runs and had seven hits in the big eighth inning. They also did it against a Kansas City bullpen that shut them down throughout last year's American League Championship Series.

"It was a big inning for us, obviously," Orioles manager Buck Showalter said. "I thought we'd make a run at them. We had to do some things different from what you normally do because of how good they are at the end of the game."

The Royals took a 6-4 lead into the bottom of the eighth with right-hander Kelvin Herrera pitching. Baltimore (68-72) loaded the bases with one out before Reimold crushed a 2-0 pitch from Herrera (4-3), knocking it high off the left-field foul pole for an 8-6 lead.

"I didn't see it hit the pole," Reimold said. "So I wasn't sure. I'm glad it worked out."

Machado followed with his homer. Center fielder Adam Jones singled before Royals reliever Franklin Morales infuriated the Orioles by drilling designated hitter Chris Davis in the back. Manager Buck Showalter got tossed, but the Orioles didn't miss a beat as first baseman Steve Pearce doubled in another run.

Two batters later, Clevenger crushed his grand slam to right off right-hander Joba Chamberlain to stretch the lead to 14-6. Clevenger said he didn't realize at first that both grand slams were still in the same inning as it took so long but thought it gave the Orioles a huge boost.

"We came together as a team," he said. "The (Reimold slam) got everybody going. That's what it takes sometimes as a team to get the line moving and get some confidence."

Right-hander Wade Davis is a big part of the tough Kansas City bullpen, but manager Ned Yost said he felt some stiffness and so they sat him for another day.

Yost also said that changed the way he had to use the bullpen. The six Royals relievers allowed 12 runs in three innings, but Yost also said Herrera did not go after Davis with that pitch.

"That pitch wasn't on purpose," Yost said. "There was a lot of hullabaloo after that. But it wasn't on purpose."

Right-hander Mychal Givens (2-0) hit designated hitter Kendrys Morales in the ninth. Morales clearly was not happy, taking a long, slow trip to first. But nothing else happened after that, and Davis said afterward that he hoped the matter was all finished.

The Royals (83-57) kept the lead for most of the game thanks to their power. Center fielder Lorenzo Cain hit two solo homers and right fielder Alex Rios hit one.

Kansas City starter Danny Duffy needed 101 pitches to get through five innings, but the Royals had a 3-2 lead when the left-hander came out before the sixth.

The Royals kept answering when the Orioles scored, and catcher Salvador Perez's RBI single gave them a 6-4 lead in the top of the eighth. That's when the Orioles turned everything around.

Cain gave the Royals an early lead when he hit a two-out solo homer to left in the first.

Kansas City added two runs in the second. Rios got a sacrifice fly and shortstop Alcides Escobar then made it 3-0 with a bloop RBI double to right.

Orioles right fielder Dariel Alvarez cut it to 3-1 with a leadoff homer to left center in the third. That was both his first major league home run and RBI.

The Orioles made it 3-2 an inning later when Davis led off with a double and later scored when catcher Caleb Joseph grounded into a force play.

Kansas City now has lost six of seven, but Cain said he's not worried.

"We've been playing consistent baseball all year long," Cain said. "You go through stretches like this. We can't let it worry us."

NOTES: Orioles CF Adam Jones returned to the lineup despite still battling a sore right shoulder. He missed the final two games of the series against the Yankees, and Thursday's off-day gave Jones three days to rest. ... Orioles C Matt Wieters remained out for a second straight game with a nagging sore left wrist. Both he and Jones had MRIs on their injuries, and manager Buck Showalter said everything came back fine. Showalter is hoping Wieters can play in Saturday afternoon's game. ... Manager Ned Yost confirmed before Friday's game that the Royals flip-flopped their Saturday and Sunday pitchers. RHP Yordano Ventura now will go Saturday and RHP Johnny Cueto in Sunday night's series finale. Yost asked Cueto which game he'd rather work and the right-hander said the night game. ... Friday's game began a 10-game road trip for the Royals, who play 17 of their final 23 away from Kansas City.