The Minnesota Twins' blueprint for 2018 included a dynamic young center fielder making great plays on defense and coming up with big hits. Of course, that role was supposed to be filled by Byron Buxton, once considered the top prospect in baseball.

Instead, the Twins are rallying around Jake Cave.

Cave hit his first career grand slam and closer Fernando Rodney survived a chaotic ninth inning as the Minnesota Twins beat the Kansas City Royals 6-5 on Sunday.

Buxton's 2018 has been mostly a washout due to injuries. The No. 2 overall pick in the 2012 draft was optioned to Triple-A Rochester and is currently on the minor league disabled list with an injured wrist. That opened the door for Cave, a 25-year-old rookie the Twins acquired in a minor league trade with the Yankees this spring.

"This is my dream," said Cave, who's more or less been the Twins' everyday center fielder since late June. "I wouldn't have it any other way."

Cave homered in his major league debut on May 19, and he established himself with a number of highlight-reel catches along the way, earning him the trust of manager Paul Molitor. The latest step in that process is came Sunday as Molitor started the left-handed hitting Cave against a hard-throwing lefty in Kansas City's Danny Duffy (7-10), who had been tough on the Twins in three prior starts this season.

That trust was rewarded with two outs in the second inning when Cave jumped on a full-count fastball for his first career grand slam and fourth homer of the season to put the Twins on top 4-2.

"I know Duffy's got good stuff, I know he's a competitor, and I know he's going to come right at me at some point with the heater," Cave said. "I got it, just stayed short, didn't try to do too much, and I was rewarded."

Cave fell behind 1-2 in the at-bat and then laid off some tough pitches, including a curveball that just missed inside at 1-2 and a fastball just below the knees one pitch before the grand slam.

"I had him punched out twice, and it's tough to see the ball go out of the yard," Duffy said. "But you still have to keep pitching."

Molitor likes what he's seen so far from the Twins' second choice in center field.

"He's got a little moxie to his game. He's not afraid to take some chances on the bases and defensively, which is good because when he got up here we said, 'Don't play tentative.' If you play timid, the game will bite you," Molitor said. "I think he's taking advantage so far. Hopefully it's a good step for him as he tries to get himself established up here."

RODNEY WALKS THE TIGHTROPE

Rodney came on to protect a one-run lead and promptly gave up Whit Merrifield's fourth hit of the game leading off the ninth. But catcher Mitch Garver threw out Merrifield trying to steal second. Alex Gordon then struck out. Big sigh of relief, right?

Hold that thought. Salvador Perez lined a single to center. Pinch runner Adalberto Mondesi stole second, then took third as Lucas Duda walked on a full-count pitch. Duda even stole second, his first stolen base since 2014.

But with the tying run 90 feet away, Rodney retired Rosell Herrera on a ground ball to earn his 24th save in 30 chances.

"I thought that we were going to find a way to score a run there," Royals manager Ned Yost said. "We just couldn't muster it."

TRAINER'S ROOM

Royals: Mondesi got a second day off to rest his right shoulder, which he strained while diving for a ball on Friday.

UP NEXT

Royals: RHP Jakob Junis (6-11, 5.12 ERA) was scheduled to take the mound on Monday to open a three-game series against the Chicago Cubs in Kansas City. In his last start, Junis pitched into the sixth inning and struck out five White Sox to pick up his first victory since May 18.