BOSTON — New Boston Red Sox boss Dave Dombrowski on Friday night made his first big move to rebuild the franchise after its third last-place finish in four years, acquiring four-time All-Star closer Craig Kimbrel from the San Diego Padres for four prospects.

Kimbrel, who saved 39 games for the Padres this year, spent the first five years of his career with the Atlanta Braves before they traded him to San Diego on the eve of the 2015 regular season. The Red Sox assumed $25 million remaining on Kimbrel’s contract but have him under control for three more seasons.

The Red Sox have acquired closer Craig Kimbrel from the San Diego Padres. Boston will send four minor-league prospects to the Padres, according to reports. The Associated Press

San Diego Padres closer Craig Kimbrel pumps his fist as he watches the final out in the Padres' 3-2 victory over the Atlanta Braves on Aug. 19 in San Diego. The Associated Press

“Moving to the American League, I’m excited,” Kimbrel said in a conference call with reporters. “It’s a league that has the big bats. And being a pitcher, you want a challenge of facing the big bats.”

The Padres receive outfielder Manuel Margot, infielders Javier Guerra and Carlos Asuaje, and left-hander Logan Allen. Only Asuaje and Margot made it as high as Double-A Portland this season.

“We didn’t give anything up at the major-league level to affect our club this year,” Dombrowski said on the conference call. “It’s good talent. Some of it’s a while away.”

Kimbrel, 27, went 4-2 with a 2.58 ERA in 61 appearances this season, 43 of them save opportunities, striking out 87 batters in 59 1/3 innings. Since the start of his first full season in 2011, he leads all major-league relievers with 224 saves and ranks second with a 1.70 ERA and 523 strikeouts.

He recorded his 200th career save in his 318th game, the fastest in major league history.

“There are various names out there, but (he’s) one of the best in baseball,” Dombrowski said. “We look for him to be our guy back there for years to come.”

The Padres finished fourth in the NL West last season despite a roster makeover by General Manager A.J. Preller. He said trading Kimbrel for young – and inexpensive – players gives him the payroll flexibility that could allow the team to get back into the free-agent market.

It also will give them depth.

“I think when you’re trading a player of Craig’s caliber I think we knew we needed quality and quantity. So I want to say all four guys are important to us,” Preller said on a separate conference call. “To really get to a championship level, you’ve got to have depth, you’ve got to have numbers and you’ve got to be strong up the middle.”

Koji Uehara emerged as the closer in Boston’s 2013 World Series championship run. But he started and ended last season on the disabled list, finishing his year on Aug. 7 with a broken right wrist.

With the acquisition of Kimbrel, Boston will move Uehara into the eighth-inning role. Junichi Tazawa would handle the seventh.

Dombrowski said Manager John Farrell spoke to Uehara and the pitcher is willing to do whatever the ballclub wanted.

“John Farrell thought he would be fine, knowing the type of individual he is,” Dombrowski said. “He said he just wanted to pitch in the World Series again.”

Asuaje, 24, spent 2015 with the Portland Sea Dogs, playing primarily second base. He has batted .278 with a .364 on-base percentage and a .440 slugging percentage in 312 career minor-league games.

Margot started the 2015 season with Class A Salem before getting promoted to Portland. He hit .276 with 27 doubles, nine triples, six home runs, 50 RBI and 73 runs.

Guerra, 20, known as an outstanding defensive shortstop, was named the Red Sox Minor League Defensive Player of the Year after hitting 15 home runs for Single-A Greenville.

Allen, 18, was an eighth-round draft pick who split time between Boston’s rookie-level affiliate and Single-A Lowell. He posed a 1.11 ERA with 26 strikeouts and only one walk in eight starts.

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