MINNEAPOLIS — Yoenis Cespedes knew how to pace himself in this rain-delayed home run derby, drawn out further by a new format.

The Oakland Athletics outfielder simply trusted his own strength.

Cespedes became the first repeat winner of the All-Star skills contest in 15 years, powering his way past Cincinnati’s Todd Frazier 9-1 in the final round Monday night.

Ken Griffey Jr. took the title in 1998 and 1999.

With a serious, determined look on his face the whole time, Cespedes finished with 28 homers. That was four fewer than last year, when he beat Washington’s Bryce Harper 9-8 in the final round.

The 28-year-old Cuban even told Athletics teammate Josh Donaldson he was doing this wrong.

“I knew he wasn’t going to win because his mentality was to take the ball out of the stadium, and I told him that is not the way you win this competition,” Cespedes said through an interpreter.

He added: “I’m somebody who’s very conscious of the power that I have. So I don’t need to put more of a swing or more of an effort in order to hit a home run. I just have to look for a good pitch and put a good swing on it, and it usually takes care of it.”

Cespedes saved his best for last, a 452-foot blast to the third deck above left field that officially measured as the longest of the night. A’s third base coach Mike Gallego again pitched to Cespedes, who went deep 32 times in last year’s derby at Citi Field in New York. Gallego’s arm looked nearly out of gas by the final round, which started after 10:30 p.m. local time.

“Maybe next year I’ll put up a better showing at the end,” Frazier said. “Now that I understand, maybe I’ll do a couple of more push-ups.”

Cespedes topped Toronto’s Jose Bautista, and Frazier surprisingly beat Miami’s Giancarlo Stanton in the semifinals.

Bautista and Stanton each earned a bye to the semifinals under the new bracketed format, which gave each player seven outs and pitted the survivors from each side in the final round. Bautista went deep 10 times in the first round, keeping the fans in the second deck above left field on their toes, and Stanton hit six.

Derby contestant Morneau makes return to Minnesota

The decision for the final spot on the National League home run derby squad was a simple call for captain Troy Tulowitzki.

Justin Morneau, his Colorado teammate, had the chance to go back to his baseball home.

“He’s a pro, and I guess that’s the best way to describe him,” Tulowitzki said. “I picked him as an easy choice. He’s meant so much to the fans here in Minnesota. It’s a great story. He’s had a great first half for us. He very well could be on this All-Star team, and he should be.”

Morneau will always have the Twins fan vote. He was moved by the crowd’s raucous reaction when he came to the plate on Monday night.

“It was real close to getting some tears in the eyes at the beginning,” he said. “It’s hard to prepare yourself for something like that, but it was definitely awesome. It’s something I’ll never forget.”